Equity Compensation Plans (Details) - USD ($)											1 Months Ended						12 Months Ended
Equity Compensation Plans (Details) - USD ($)	May 20, 2025	Mar. 15, 2025	Mar. 10, 2025	May 05, 2024	Mar. 15, 2024	Mar. 10, 2024	May 05, 2023	Mar. 10, 2023	May 05, 2022	Mar. 26, 2020	May 31, 2025	Feb. 28, 2025	May 31, 2024	Mar. 31, 2023	Mar. 31, 2022	May 31, 2021	Dec. 31, 2025	Dec. 31, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of shares awarded upon completion of 12 months employment																	20
Director
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Fully-vested shares of common stock issued																	1,000
Amount payable to non-employee directors																	$ 15,000
Employees
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock compensation expense																	$ 104,120	$ 54,226
2018 Equity Plan \| Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Maximum issuance of common stock options																	325,000
2018 Equity Plan \| Director
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Fully-vested shares of common stock issued											11,692		14,325
Fully vested shares of common stock issued, per share value											$ 31.52		$ 21.94
Stock compensation expense																	$ 350,451	292,109
Restricted Stock Units (RSUs) \| Long-Term Incentive Plan \| Year 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock compensation expense																		7,365
Shares of common stock grant date fair market value																$ 17.93
Restricted Stock Units (RSUs) \| Long-Term Incentive Plan \| Year 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock compensation expense																	26,145	104,581
Shares of common stock grant date fair market value															$ 21.88
Restricted Stock Units (RSUs) \| Long-Term Incentive Plan \| Year 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock compensation expense																	110,340	110,340
Shares of common stock grant date fair market value														$ 18.25
Unrecognized compensation expense related to unvested units																	27,585
Restricted Stock Units (RSUs) \| Long-Term Incentive Plan \| Year 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock compensation expense																	113,256	$ 66,066
Shares of common stock grant date fair market value													$ 22.26
Unrecognized compensation expense related to unvested units																	160,446
Restricted Stock Units (RSUs) \| Long-Term Incentive Plan \| Year 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock compensation expense																	112,868
Shares of common stock grant date fair market value												$ 37.59
Unrecognized compensation expense related to unvested units																	$ 293,456
Performance Vesting Restricted Shares \| Officer \| Share-based Payment Arrangement, Tranche One
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation performance based award, percent																	50.00%
Performance Vesting Restricted Shares \| Officer \| Share-based Payment Arrangement, Tranche Two
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation performance based award, percent																	150.00%
Performance Vesting Restricted Shares \| Long-Term Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation award vesting period										3 years
Performance Vesting Restricted Shares \| Long-Term Incentive Plan \| Year 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation shares of common stock granted																7,389
Share based compensation performance period																3 years
Share-based compensation shares failed to vest						7,389
Performance Vesting Restricted Shares \| Long-Term Incentive Plan \| Year 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation shares of common stock granted															8,096
Share based compensation performance period															3 years
Performance Vesting Restricted Shares \| Long-Term Incentive Plan \| Year 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation shares of common stock granted														10,214
Share based compensation performance period														3 years
Performance Vesting Restricted Shares \| Long-Term Incentive Plan \| Year 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation shares of common stock granted													8,593
Share based compensation performance period													3 years
Performance Vesting Restricted Shares \| Long-Term Incentive Plan \| Year 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation shares of common stock granted												6,006
Share based compensation performance period												3 years
Time-Vesting Restricted Shares \| Long-Term Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation award vesting period										3 years
Time-Vesting Restricted Shares \| Long-Term Incentive Plan \| Year 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation award vesting period																3 years
Share-based compensation shares of common stock granted				3,693			2,463		3,693							3,693
Shares-based compensation shares of common stock issued				1,233			1,230		1,230
Time-Vesting Restricted Shares \| Long-Term Incentive Plan \| Year 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation award vesting period															3 years
Share-based compensation shares of common stock granted			6,238			6,238		6,238							6,238
Shares-based compensation shares of common stock issued			2,080			2,079		2,079
Time-Vesting Restricted Shares \| Long-Term Incentive Plan \| Year 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation award vesting period														3 years
Share-based compensation shares of common stock granted		7,920			7,920									7,920
Shares-based compensation shares of common stock issued		2,639			2,639
Time-Vesting Restricted Shares \| Long-Term Incentive Plan \| Year 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation award vesting period													3 years
Share-based compensation shares of common stock granted	6,662												6,662
Shares-based compensation shares of common stock issued	2,219
Time-Vesting Restricted Shares \| Long-Term Incentive Plan \| Year 2025
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based compensation award vesting period												3 years
Share-based compensation shares of common stock granted												4,797

FIRST UNITED CORP/MD/ 10-K