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Fair Value of Financial Instruments (Narrative) (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
security
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Amortized Cost $ 139,263,000   $ 139,263,000   $ 144,123,000
Available-for-sale Securities 135,809,000   135,809,000   137,641,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net     0 $ 0  
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 0 0  
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 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 18,387,000   $ 18,387,000   18,358,000
Available-for-sale Securities $ 14,872,000   $ 14,872,000   $ 15,277,000