Fair Value of Financial Instruments - Fair Value, by Balance Sheet Grouping (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments available-for-sale, at fair value	$ 168,948,000	$ 127,551,000
Investments held-to-maturity, at amortized cost	2,432,000	2,418,000
FHLB stock	5,465,000	6,410,000
Derivative Asset, Fair Value, Gross Asset	1,500,000
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash on hand and in banks	7,246,000	7,995,000
Interest-earning deposits	66,145,000	72,494,000
Investments available-for-sale, at fair value	3,767,000	0
Investments held-to-maturity, at amortized cost	0	0
Loans receivable, net	0	0
FHLB stock	0	0
Accrued interest receivable	0	0
Derivative Asset, Fair Value, Gross Asset	0
Deposits	863,347,000	684,057,000
Certificates of deposit, retail	0	0
Advances from the FHLB	0	0
Accrued interest payable	0	0
Derivative Liability, Fair Value, Gross Liability		0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash on hand and in banks	0	0
Interest-earning deposits	0	0
Investments available-for-sale, at fair value	165,181,000	127,551,000
Investments held-to-maturity, at amortized cost	2,432,000	2,418,000
Loans receivable, net	0	0
FHLB stock	5,465,000	6,410,000
Accrued interest receivable	5,285,000	5,508,000
Derivative Asset, Fair Value, Gross Asset	1,491,000
Deposits	0	0
Certificates of deposit, retail	295,929,000	418,118,000
Advances from the FHLB	95,003,000	120,006,000
Accrued interest payable	112,000	211,000
Derivative Liability, Fair Value, Gross Liability		2,825,000
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash on hand and in banks	0	0
Interest-earning deposits	0	0
Investments available-for-sale, at fair value	0	0
Investments held-to-maturity, at amortized cost	0	0
Loans receivable, net	1,109,887,000	1,101,559,000
FHLB stock	0	0
Accrued interest receivable	0	0
Derivative Asset, Fair Value, Gross Asset	0
Deposits	0	0
Certificates of deposit, retail	0	0
Advances from the FHLB	0	0
Accrued interest payable	0	0
Derivative Liability, Fair Value, Gross Liability		0
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash on hand and in banks	7,246,000	7,995,000
Interest-earning deposits	66,145,000	72,494,000
Investments available-for-sale, at fair value	168,948,000	127,551,000
Investments held-to-maturity, at amortized cost	2,432,000	2,418,000
Loans receivable, net	1,103,461,000	1,100,582,000
FHLB stock	5,465,000	6,410,000
Accrued interest receivable	5,285,000	5,508,000
Derivative Asset, Fair Value, Gross Asset	1,491,000
Deposits	863,347,000	684,057,000
Certificates of deposit, retail	294,127,000	409,576,000
Advances from the FHLB	95,000,000	120,000,000
Accrued interest payable	112,000	211,000
Derivative Liability, Fair Value, Gross Liability		2,825,000
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash on hand and in banks	7,246,000	7,995,000
Interest-earning deposits	66,145,000	72,494,000
Investments available-for-sale, at fair value	168,948,000	127,551,000
Investments held-to-maturity, at amortized cost	2,432,000	2,418,000
Loans receivable, net	1,109,887,000	1,101,559,000
FHLB stock	5,465,000	6,410,000
Accrued interest receivable	5,285,000	5,508,000
Derivative Asset, Fair Value, Gross Asset	1,491,000
Deposits	863,347,000	684,057,000
Certificates of deposit, retail	295,929,000	418,118,000
Advances from the FHLB	95,003,000	120,006,000
Accrued interest payable	$ 112,000	211,000
Derivative Liability, Fair Value, Gross Liability		$ 2,825,000