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Loans (Officer and Director Loans) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Loans and Leases Receivable Disclosure [Abstract]    
Loan portfolio secured by real estate, percent 94.00% 96.00%
Loans and Leases Receivable, Related Parties [Roll Forward]    
Balance, beginning of year $ 29,256 $ 37,394
New loans and advances 6,121 31
Loan repayments (2,268) (8,169)
Balance, end of year $ 33,109 $ 29,256