Loans and Allowance for Credit Losses - Credit Quality Indicators Most Closely Monitored For Other Than Residential Real Estate And Consumer Loans By Class and based on Payment Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	$ 118,850,710	$ 114,210,342
Current period gross charge-offs, Total	195,959	1,041,777
Nonperforming
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	316,994	1,231,913
Multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2023		1,542,939
Amortized cost basis by origination year, 2022	1,120,234	2,967,822
Amortized cost basis by origination year, 2021	2,596,198	144,857
Amortized cost basis by origination year, Prior	307,478	178,316
Total	4,023,910	4,833,934
Multifamily \| Satisfactory
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2023		1,542,939
Amortized cost basis by origination year, 2022	1,120,234	2,967,822
Amortized cost basis by origination year, 2021	2,596,198	144,857
Amortized cost basis by origination year, Prior	307,478	178,316
Total	4,023,910	4,833,934
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2025	5,022,520	16,305,064
Amortized cost basis by origination year, 2024	16,102,285	16,895,973
Amortized cost basis by origination year, 2023	16,510,886	5,951,550
Amortized cost basis by origination year, 2022	5,654,214	3,324,053
Amortized cost basis by origination year, 2021	2,087,581	1,395,929
Amortized cost basis by origination year, Prior	9,031,944	10,012,715
Total	54,409,430	53,885,284
Current period gross charge-offs, Prior	43,612	760,738
Current period gross charge-offs, Total	43,612	760,738
Commercial \| Nonperforming
Financing Receivable, Allowance for Credit Loss [Line Items]
Total		129,732
Commercial \| Satisfactory
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2025	4,706,140	15,934,535
Amortized cost basis by origination year, 2024	16,008,333	16,581,498
Amortized cost basis by origination year, 2023	16,322,270	4,852,500
Amortized cost basis by origination year, 2022	4,595,265	2,587,014
Amortized cost basis by origination year, 2021	1,592,970	1,247,805
Amortized cost basis by origination year, Prior	5,964,808	6,906,401
Total	49,189,786	48,109,753
Commercial \| Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2025	316,380	370,529
Amortized cost basis by origination year, 2024		314,475
Amortized cost basis by origination year, 2023	188,616	1,099,050
Amortized cost basis by origination year, 2022	1,058,949	737,039
Amortized cost basis by origination year, 2021	494,611	148,124
Amortized cost basis by origination year, Prior		522,179
Total	2,058,556	3,191,396
Commercial \| Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2024	93,952
Amortized cost basis by origination year, Prior	3,067,136	2,584,135
Total	3,161,088	2,584,135
Construction and Development
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2025	2,528,781	524,993
Amortized cost basis by origination year, 2024	221,443	2,085,264
Amortized cost basis by origination year, 2023	1,284,769
Amortized cost basis by origination year, Prior	28,657	351,425
Total	4,063,650	2,961,682
Construction and Development \| Satisfactory
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2025	2,528,781	524,993
Amortized cost basis by origination year, 2024	221,443	2,085,264
Amortized cost basis by origination year, 2023	1,284,769
Amortized cost basis by origination year, Prior		322,768
Total	4,034,993	2,933,025
Construction and Development \| Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, Prior	28,657	28,657
Total	28,657	28,657
Farmland
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2025	1,513,435	127,058
Amortized cost basis by origination year, 2024	124,097	521,963
Amortized cost basis by origination year, 2023	503,867
Amortized cost basis by origination year, 2022		1,078,411
Amortized cost basis by origination year, 2021	852,934	912,635
Amortized cost basis by origination year, Prior	1,392,195	1,203,422
Total	4,386,528	3,843,489
Farmland \| Satisfactory
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2025	1,513,435	127,058
Amortized cost basis by origination year, 2024	124,097	495,000
Amortized cost basis by origination year, 2023	480,000
Amortized cost basis by origination year, 2022		1,078,411
Amortized cost basis by origination year, 2021	852,934	688,696
Amortized cost basis by origination year, Prior	1,174,313	1,203,422
Total	4,144,779	3,592,587
Farmland \| Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2024		26,963
Amortized cost basis by origination year, 2023	23,867
Amortized cost basis by origination year, 2021		223,939
Amortized cost basis by origination year, Prior	217,882
Total	241,749	250,902
Commercial and Industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2025	4,375,584	2,065,485
Amortized cost basis by origination year, 2024	2,844,047	894,346
Amortized cost basis by origination year, 2023	389,749	3,538,144
Amortized cost basis by origination year, 2022	3,459,212	384,614
Amortized cost basis by origination year, 2021	173,725	1,345,138
Amortized cost basis by origination year, Prior	1,312,545	1,815,777
Total	12,554,862	10,043,504
Current period gross charge-offs, Prior	7,074	258,693
Current period gross charge-offs, Total	7,074	258,693
Commercial and Industrial \| Satisfactory
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2025	4,375,584	2,065,485
Amortized cost basis by origination year, 2024	2,844,047	674,123
Amortized cost basis by origination year, 2023	264,762	3,538,144
Amortized cost basis by origination year, 2022	3,447,290	279,893
Amortized cost basis by origination year, 2021	134,340	1,326,814
Amortized cost basis by origination year, Prior	849,078	1,553,549
Total	11,915,101	9,438,008
Commercial and Industrial \| Special Mention
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2024		220,223
Amortized cost basis by origination year, 2023	124,987
Amortized cost basis by origination year, 2022	11,922	72,057
Amortized cost basis by origination year, 2021	2,683	18,324
Amortized cost basis by origination year, Prior	460,556	74,459
Total	600,148	385,063
Commercial and Industrial \| Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2022		32,664
Amortized cost basis by origination year, 2021	36,702
Amortized cost basis by origination year, Prior	2,911	187,769
Total	39,613	220,433
1-4 Family, including Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2025	8,210,818	3,700,956
Amortized cost basis by origination year, 2024	2,838,343	3,983,417
Amortized cost basis by origination year, 2023	3,688,437	4,002,872
Amortized cost basis by origination year, 2022	3,433,214	7,426,113
Amortized cost basis by origination year, 2021	6,490,489	2,575,966
Amortized cost basis by origination year, Prior	10,485,212	11,283,361
Total	35,146,513	32,972,685
Current period gross charge-offs, 2021	40,177
Current period gross charge-offs, Prior	75,024	12,225
Current period gross charge-offs, Total	115,201	12,225
1-4 Family, including Construction \| Performing
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2025	8,174,987	3,700,956
Amortized cost basis by origination year, 2024	2,729,459	3,983,417
Amortized cost basis by origination year, 2023	3,688,437	4,002,872
Amortized cost basis by origination year, 2022	3,433,214	7,329,773
Amortized cost basis by origination year, 2021	6,490,489	2,507,017
Amortized cost basis by origination year, Prior	10,349,900	10,634,470
Total	34,866,486	32,158,505
1-4 Family, including Construction \| Nonperforming
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2025	35,831
Amortized cost basis by origination year, 2024	108,884
Amortized cost basis by origination year, 2022		96,340
Amortized cost basis by origination year, 2021		68,949
Amortized cost basis by origination year, Prior	135,312	648,891
Total	280,027	814,180
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2025	674,893	1,193,170
Amortized cost basis by origination year, 2024	480,286	1,652,278
Amortized cost basis by origination year, 2023	1,111,528	548,280
Amortized cost basis by origination year, 2022	276,947	89,166
Amortized cost basis by origination year, 2021	22,278	1,151,080
Amortized cost basis by origination year, Prior	1,904,655	1,178,146
Total	4,470,587	5,812,120
Current period gross charge-offs, 2022		325
Current period gross charge-offs, Prior	30,072	9,796
Current period gross charge-offs, Total	30,072	10,121
Consumer \| Performing
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, 2025	674,893	1,193,170
Amortized cost basis by origination year, 2024	480,286	1,652,278
Amortized cost basis by origination year, 2023	1,111,528	548,280
Amortized cost basis by origination year, 2022	276,947	89,166
Amortized cost basis by origination year, 2021	22,278	1,151,080
Amortized cost basis by origination year, Prior	1,867,688	1,110,578
Total	4,433,620	5,744,552
Consumer \| Nonperforming
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost basis by origination year, Prior	36,967	67,568
Total	$ 36,967	$ 67,568

Security Midwest Bancorp, Inc. 10-K