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Borrowings and Related Interest (Narrative) (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Repurchase agreements matured and not renewed $ 140,000,000  
Subordinated Debt 36,083,000 $ 36,083,000
Debt extinguishment costs 50,000,000  
Repurchase Agreement [Member]    
Debt Instrument [Line Items]    
Interest payable   274,000
Debt outstanding 0  
Federal Home Loan Bank Advances [Member]    
Debt Instrument [Line Items]    
Loans pledged as collateral to secure FHLB advances 1,186,000,000 1,060,000,000.000
Additional Borrowing Capacity $ 992,000,000 $ 983,000,000
Weighted average period remaining maturity of FHLB advances 19 months 24 days 22 months 21 days
Interest payable $ 97,000 $ 160,000
Minimum amount of qualifying collateral 110.00%  
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