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Schedule of Impaired Financing Receivables (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Unpaid contractual principal $ 15,059,000 $ 14,763,000
Impaired loan balance 12,758,000 12,462,000
Impaired loans without an allowance 7,119,000 8,473,000
Impaired loans with an allowance 5,639,000 3,989,000
Related allowance recorded 492,000 266,000
Year-to-date average loan balance 12,864,000 12,948,000
Year-to-date interest income recognized 43,000 148,000
One To Four Family Residential Real Estate Loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Unpaid contractual principal 956,000 914,000
Impaired loan balance 956,000 914,000
Impaired loans without an allowance 956,000 914,000
Impaired loans with an allowance
Related allowance recorded
Year-to-date average loan balance 963,000 925,000
Year-to-date interest income recognized 2,000 3,000
Construction and Land Loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Unpaid contractual principal 2,762,000 2,872,000
Impaired loan balance 1,027,000 1,137,000
Impaired loans without an allowance 1,027,000 1,137,000
Impaired loans with an allowance
Related allowance recorded
Year-to-date average loan balance 1,043,000 1,211,000
Year-to-date interest income recognized 6,000 26,000
Commercial Real Estate Loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Unpaid contractual principal 7,874,000 8,119,000
Impaired loan balance 7,874,000 8,119,000
Impaired loans without an allowance 2,404,000 4,302,000
Impaired loans with an allowance 5,470,000 3,817,000
Related allowance recorded 424,000 177,000
Year-to-date average loan balance 7,875,000 8,152,000
Year-to-date interest income recognized 9,000 8,000
Commercial Loan [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Unpaid contractual principal 2,030,000 1,990,000
Impaired loan balance 1,679,000 1,639,000
Impaired loans without an allowance 1,561,000 1,543,000
Impaired loans with an allowance 118,000 96,000
Related allowance recorded 28,000 22,000
Year-to-date average loan balance 1,705,000 1,984,000
Year-to-date interest income recognized 10,000 43,000
Agriculture Loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Unpaid contractual principal 1,397,000 829,000
Impaired loan balance 1,182,000 614,000
Impaired loans without an allowance 1,131,000 538,000
Impaired loans with an allowance 51,000 76,000
Related allowance recorded 40,000 67,000
Year-to-date average loan balance 1,237,000 618,000
Year-to-date interest income recognized 16,000 67,000
Municipal Loans [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Unpaid contractual principal 36,000 36,000
Impaired loan balance 36,000 36,000
Impaired loans without an allowance 36,000 36,000
Impaired loans with an allowance
Related allowance recorded
Year-to-date average loan balance 36,000 54,000
Year-to-date interest income recognized 1,000
Consumer Loan [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Unpaid contractual principal 4,000 3,000
Impaired loan balance 4,000 3,000
Impaired loans without an allowance 4,000 3,000
Impaired loans with an allowance
Related allowance recorded
Year-to-date average loan balance 5,000 4,000
Year-to-date interest income recognized