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Fair Values (Schedule of Level 3 Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 1,161 $ 1,167
Purchases 20,240 0
Repayments (10) (10)
Unrealized gains recorded in other comprehensive income 275 4
Ending balance $ 21,666 $ 1,161