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Fair Value of Financial Instruments (Reconciliation of Fair Valued Assets Measured on a Recurring Basis) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Collateralized debt obligations [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance $ 20,357 $ 19,532 $ 20,254 $ 22,211
Included in other comprehensive income (6,010) 698 (5,907) (1,981)
Ending Balance $ 14,347 20,230 $ 14,347 20,230
Interest Rate Swap [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance   (33)   (66)
Included in other comprehensive income   33   66
Ending balance   $ 0   $ 0