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Loans (Related Parties Roll Forward) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Loans and Leases Receivable, Related Parties [Roll Forward]    
Balance at beginning of year $ 114,305 $ 141,465
Advances 56,652 57,165
Repayments (55,284) (84,325)
Balance at end of year $ 115,673 $ 114,305