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Borrowings and Related Interest (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2003
Debt Instrument [Line Items]      
Repurchase agreements matured and not renewed $ 140,000,000    
Subordinated Debt 36,083,000 $ 36,083,000  
Trust redeemable preferred securities issued     $ 35,000,000.0
Extinguishment of debt amount 50,000,000    
Repurchase Agreement [Member]      
Debt Instrument [Line Items]      
Debt outstanding 0    
Federal Home Loan Bank Advances [Member]      
Debt Instrument [Line Items]      
Loans pledged as collateral to secure FHLB advances 1,159,000,000 1,060,000,000.000  
Additional Borrowing Capacity $ 814,000,000 $ 983,000,000  
Weighted average period remaining maturity of FHLB advances 18 months 6 days 22 months 21 days  
Interest payable $ 96,000 $ 160,000  
Minimum amount of qualifying collateral 110.00%    
Junior Subordinated Debt [Member]      
Debt Instrument [Line Items]      
Effective interest rate 3.18% 4.85%  
Face amount $ 36,100,000    
Debt Instrument Interest Rate Terms 3-month LIBOR plus 295 basis points    
Debt Instrument Basis Spread On Variable Rate 2.95%    
Minimum [Member] | Federal Home Loan Bank Advances [Member]      
Debt Instrument [Line Items]      
Debt instrument term 1 day    
Maximum [Member] | Federal Home Loan Bank Advances [Member]      
Debt Instrument [Line Items]      
Debt instrument term 7 years