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Loans (Details 4) - USD ($)
$ in Thousands
Dec. 31, 2022
Mar. 31, 2022
Financing Receivable, Past Due [Line Items]    
Impaired Financing Receivable, Recorded Investment $ 4,983 $ 1,779
Impaired Financing Receivable, Unpaid Principal Balance 5,508 47
Impaired Financing Receivable, Related Allowance  
Commercial, Financial And Agricultural Loan [Member]    
Financing Receivable, Past Due [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 29
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 29
Impaired Financing Receivable, with Related Allowance, Recorded Investment
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance
Impaired Financing Receivable, Recorded Investment 29
Impaired Financing Receivable, Unpaid Principal Balance 29
Impaired Financing Receivable, Related Allowance  
Construction Loans [Member]    
Financing Receivable, Past Due [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance
Impaired Financing Receivable, with Related Allowance, Recorded Investment
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance
Impaired Financing Receivable, Recorded Investment
Impaired Financing Receivable, Unpaid Principal Balance
Impaired Financing Receivable, Related Allowance  
Residential Mortgage [Member]    
Financing Receivable, Past Due [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 34 42
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 51 1
Impaired Financing Receivable, with Related Allowance, Recorded Investment
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance
Impaired Financing Receivable, Recorded Investment 34 42
Impaired Financing Receivable, Unpaid Principal Balance 51 1
Impaired Financing Receivable, Related Allowance  
Commercial Real Estate [Member]    
Financing Receivable, Past Due [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 4,752 1,737
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 5,260 46
Impaired Financing Receivable, with Related Allowance, Recorded Investment
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance
Impaired Financing Receivable, Recorded Investment 4,752 1,737
Impaired Financing Receivable, Unpaid Principal Balance 5,260 46
Impaired Financing Receivable, Related Allowance  
Home Equity Line of Credit [Member]    
Financing Receivable, Past Due [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 168
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance 168
Impaired Financing Receivable, with Related Allowance, Recorded Investment
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance
Impaired Financing Receivable, Recorded Investment 168
Impaired Financing Receivable, Unpaid Principal Balance 168
Impaired Financing Receivable, Related Allowance  
Consumer Portfolio Segment [Member]    
Financing Receivable, Past Due [Line Items]    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance
Impaired Financing Receivable, with Related Allowance, Recorded Investment
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance
Impaired Financing Receivable, Recorded Investment
Impaired Financing Receivable, Unpaid Principal Balance
Impaired Financing Receivable, Related Allowance