Securities - Summary of Investments with Unrealized Losses (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Available for Sale Securities, Fair Value
Less Than 12 Months	$ 1,680,218	$ 1,528,223
12 Months or Longer	40,668,857	43,884,116
Total	42,349,075	45,412,339
Available for Sale Securities, Unrealized Losses
Less than 12 months	(3,041)	(38,095)
12 Months or Longer	(4,481,859)	(6,564,481)
Total	(4,484,900)	(6,602,576)
Municipal Bonds, Taxable [Member]
Available for Sale Securities, Fair Value
12 Months or Longer	6,594,882	6,912,398
Total	6,594,882	6,912,398
Available for Sale Securities, Unrealized Losses
12 Months or Longer	(810,389)	(1,108,722)
Total	(810,389)	(1,108,722)
Municipal Bonds, Non-Taxable [Member]
Available for Sale Securities, Fair Value
12 Months or Longer	1,458,114	2,220,973
Total	1,458,114	2,220,973
Available for Sale Securities, Unrealized Losses
12 Months or Longer	(62,256)	(118,010)
Total	(62,256)	(118,010)
U.S. Government Treasuries [Member]
Available for Sale Securities, Fair Value
12 Months or Longer	7,551,920	7,258,290
Total	7,551,920	7,258,290
Available for Sale Securities, Unrealized Losses
12 Months or Longer	(445,566)	(738,449)
Total	(445,566)	(738,449)
U.S. Government Agencies [Member]
Available for Sale Securities, Fair Value
12 Months or Longer	1,000,427	981,591
Total	1,000,427	981,591
Available for Sale Securities, Unrealized Losses
12 Months or Longer	(119,786)	(175,751)
Total	(119,786)	(175,751)
Residential Mortgage-Backed Securities [Member]
Available for Sale Securities, Fair Value
Less Than 12 Months	1,680,218	1,528,223
12 Months or Longer	11,195,465	13,351,607
Total	12,875,683	14,879,830
Available for Sale Securities, Unrealized Losses
Less than 12 months	(3,041)	(38,095)
12 Months or Longer	(1,846,091)	(2,526,572)
Total	(1,849,132)	(2,564,667)
Collateralized Mortgage Obligations [Member]
Available for Sale Securities, Fair Value
12 Months or Longer	12,868,049	13,159,257
Total	12,868,049	13,159,257
Available for Sale Securities, Unrealized Losses
12 Months or Longer	(1,197,771)	(1,896,977)
Total	$ (1,197,771)	$ (1,896,977)

Security Midwest Bancorp, Inc. 10-Q