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Loans - Loans individually evaluated for impairment by portfolio class (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Financing Receivable Impaired [Line Items]      
Unpaid principal balance $ 3,455   $ 3,478
Recorded Investment 3,422   3,440
Related Allowance 0   0
Average Recorded Investment 3,386 $ 7,874  
Interest Income Recognized 41 117  
Construction [Member]      
Financing Receivable Impaired [Line Items]      
Unpaid principal balance 0   0
Recorded Investment 0   0
Related Allowance 0   0
Real estate loans [Member] | One To Four Family [Member]      
Financing Receivable Impaired [Line Items]      
Unpaid principal balance 154   46
Recorded Investment 121   14
Related Allowance 0   0
Average Recorded Investment 67 439  
Interest Income Recognized 1 5  
Real estate loans [Member] | Multifamily [Member]      
Financing Receivable Impaired [Line Items]      
Unpaid principal balance 0   0
Recorded Investment 0   0
Related Allowance 0   0
Average Recorded Investment 0 0  
Interest Income Recognized 0 0  
Real estate loans [Member] | Commercial [Member]      
Financing Receivable Impaired [Line Items]      
Unpaid principal balance 3,175   3,189
Recorded Investment 3,175   3,189
Related Allowance 0   0
Average Recorded Investment 3,182 6,339  
Interest Income Recognized 38 94  
Commercial Loans [Member]      
Financing Receivable Impaired [Line Items]      
Unpaid principal balance 126   243
Recorded Investment 126   237
Related Allowance 0   0
Average Recorded Investment 137 1,096  
Interest Income Recognized 2 18  
Consumer Loans [Member]      
Financing Receivable Impaired [Line Items]      
Unpaid principal balance 0   0
Recorded Investment 0   0
Related Allowance 0   $ 0
Average Recorded Investment 0 0  
Interest Income Recognized $ 0 $ 0