Disclosures about Fair Value of Assets and Liabilities - Summary Of Estimated Fair Values Of Financial Instruments Not Carried At Fair Value On Consolidated Balance Sheets (Details) - USD ($)	Mar. 31, 2026	Dec. 31, 2025
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 35,909,448	$ 50,378,538
Accrued interest receivable	793,171	751,961
Deposits	148,135,554	152,221,974
Accrued interest payable	154,527	153,018
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
FHLB Stock	1,575,000	1,575,000
Bank owned life insurance	2,326,500	2,308,325
Deposits	43,939,880	44,317,000
Advances from the FHLB	35,011,000	35,008,000
Advances by borrowers for taxes and insurance	652,184	399,702
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale	162,362
Loans, net	126,769,000	108,908,000
Mortgage servicing rights, net	582,000	582,000
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	35,909,448	50,378,538
Loans held for sale	160,000
Loans, net	128,013,854	117,816,517
FHLB Stock	1,575,000	1,575,000
Mortgage servicing rights, net	324,044	326,764
Bank owned life insurance	2,326,500	2,308,325
Accrued interest receivable	793,171	751,961
Deposits	192,096,792	196,505,483
Advances from the FHLB	35,000,000	35,000,000
Advances by borrowers for taxes and insurance	652,184	399,702
Accrued interest payable	154,527	153,018
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	35,909,448	50,378,538
Loans held for sale	162,362
Loans, net	126,769,000	108,908,000
FHLB Stock	1,575,000	1,575,000
Mortgage servicing rights, net	582,000	582,000
Bank owned life insurance	2,326,500	2,308,325
Accrued interest receivable	793,171	751,961
Deposits	192,075,434	196,538,974
Advances from the FHLB	35,011,000	35,008,000
Advances by borrowers for taxes and insurance	652,184	399,702
Accrued interest payable	$ 154,527	$ 153,018

Security Midwest Bancorp, Inc. 10-Q