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Borrowings and Related Interest (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2003
Debt Instrument [Line Items]      
Subordinated capital notes $ 36,083 $ 36,083  
Trust redeemable preferred securities issued     $ 35,000
Advances from the Federal Home Loan Bank      
Debt Instrument [Line Items]      
Minimum amount of qualifying collateral 110.00%    
Loans pledged as collateral to secure FHLB advances $ 949,000 1,159,000  
Additional borrowing capacity $ 697,300 $ 814,000  
Weighted average period remaining maturity of FHLB advances 3 days 18 months 6 days  
Original debt instrument term of FHLB advances 1 month    
Accrued interest payable $ 8 $ 96  
Junior Subordinated Debt      
Debt Instrument [Line Items]      
Par value of subordinated deferrable interest debenture $ 36,100    
Basis spread on variable rate 2.95%    
Effective interest rate 3.17% 3.18%