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Fair Values (Schedule of Level 3 Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 21,666 $ 1,161
Purchases 0 20,240
Repayments (10) (10)
Unrealized gains recorded in other comprehensive income 1,186 275
Ending balance $ 22,842 $ 21,666