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Fair Values (Schedule of Level 3 Assets) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 21,666 $ 1,161
Purchases 0 4,366
Repayments (10) (10)
Unrealized gains recorded in other comprehensive income 566 464
Ending balance $ 22,222 $ 5,981