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Fair Value of Financial Instruments (Reconciliation of Fair Valued Assets Measured on a Recurring Basis) (Details) - Collateralized debt obligations [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 15,277 $ 14,920
Included in other comprehensive income (125) 1,057
Ending Balance $ 15,152 $ 15,977