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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Collateralized debt obligations [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance $ 19,532 $ 28,391 $ 22,211 $ 25,339
Included in other comprehensive income 698 1,655 (1,981) 4,707
Ending Balance 20,230 30,046 20,230 30,046
Interest Rate Swap [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance (33) (164) (66) (199)
Included in other comprehensive income 33 24 66 59
Ending balance $ 0 $ (140) $ 0 $ (140)