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Financial Statement Presentation, Recently Adopted Accounting Standards (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Recently Adopted Accounting Standards [Abstract]    
Allowance for credit losses on securities available for sale $ 0  
Allowance for credit losses on securities held to maturity 0  
Assets [Abstract]    
Allowance for credit losses on loans 46,178  
Liabilities and Shareholders' Equity [Abstract]    
Undivided Profits 355,948 $ 349,056
Pre-CECL Adoption [Member]    
Assets [Abstract]    
Allowance for credit losses on loans   44,267
Allowance for credit losses on securities   0
Liabilities and Shareholders' Equity [Abstract]    
Tax Effect, net   0
Total   44,285
Undivided Profits   349,056
Unfunded Loan Commitment [Member]    
Assets [Abstract]    
Allowance for credit losses on loans $ 2,653 18
Unfunded Loan Commitment [Member] | Pre-CECL Adoption [Member]    
Liabilities and Shareholders' Equity [Abstract]    
Other liabilities (ACL unfunded loan commitments)   18
ASU 2016-13 [Member]    
Assets [Abstract]    
Allowance for credit losses on loans   46,620
Allowance for credit losses on securities   0
Liabilities and Shareholders' Equity [Abstract]    
Tax Effect, net   0
Total   48,973
Undivided Profits   345,586
ASU 2016-13 [Member] | Impact of Adoption [Member]    
Assets [Abstract]    
Allowance for credit losses on loans   2,353
ASU 2016-13 [Member] | Unfunded Loan Commitment [Member]    
Assets [Abstract]    
Allowance for credit losses on loans   2,353
Liabilities and Shareholders' Equity [Abstract]    
Other liabilities (ACL unfunded loan commitments)   2,353
ASU 2016-13 [Member] | Unfunded Loan Commitment [Member] | Impact of Adoption [Member]    
Assets [Abstract]    
Allowance for credit losses on loans   2,335
ASU 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]    
Recently Adopted Accounting Standards [Abstract]    
Allowance for credit losses on securities available for sale   0
Allowance for credit losses on securities held to maturity   0
ASU 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Impact of Adoption [Member]    
Assets [Abstract]    
Allowance for credit losses on loans   2,353
Allowance for credit losses on securities   0
Liabilities and Shareholders' Equity [Abstract]    
Tax Effect, net   (1,218)
Total   3,470
Undivided Profits   (3,470)
ASU 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Unfunded Loan Commitment [Member] | Impact of Adoption [Member]    
Liabilities and Shareholders' Equity [Abstract]    
Other liabilities (ACL unfunded loan commitments)   $ 2,335