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Other Operating Income and Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other operating expense      
Advertising and marketing expense $ 1,099 $ 1,178 $ 1,022
Accounting and auditing expenses 690 797 746
ATM and interchange expense 853 814 760
Legal fees and expenses 377 369 769
ATM and debit card income      
Other operating income      
ATM and debit card income 3,024 2,714 2,630
Collections/foreclosures/ other real estate owned expense      
Other operating expense      
Collections/foreclosures/ other real estate owned expense $ 278 $ 432 $ 657