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Fair Value of Financial Instruments (Narrative) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
security
Jun. 30, 2019
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
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      
Amortized Cost 149,250,000   149,250,000     $ 135,008,000  
Available-for-sale Securities 146,190,000   146,190,000     131,305,000  
Fair value, assets, level 1 to level 2 transfers, amount 0 0 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        
Amortized Cost 18,515,000   $ 18,515,000     18,443,000  
Available-for-sale Securities $ 11,952,000   $ 11,952,000     $ 14,354,000