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Borrowings and Related Interest (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Subordinated Debt $ 36,083 $ 36,083
Federal Home Loan Bank Advances [Member]    
Debt Instrument [Line Items]    
Loans pledged as collateral to secure FHLB advances 1,051,000 1,159,000
Additional Borrowing Capacity $ 734,000 $ 814,000
Weighted average period remaining maturity of FHLB advances 15 months 18 months 6 days
Interest payable $ 93 $ 96
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 5 years