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Fair Value of Financial Instruments (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
security
Sep. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Gains or losses included in earnings attributable to the change in realized/unrealized gains or losses related to the assets $ 0 $ 0 $ 0 $ 0        
Fair value, assets, level 1 to level 2 transfers, amount         $ 0   $ 0  
Fair value, assets, level 2 to level 1 transfer, amount 0 $ 0 $ 0 $ 0   $ 0   $ 0
Collateralized debt obligations [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Acquired trust preferred securities, number of securities | security     9          
Collateralized debt obligations [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]                
Trust preferred securities, amortized cost 18,500,000   $ 18,500,000          
Trust preferred securities, fair value $ 12,800,000   $ 12,800,000