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Other Operating Income and Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other operating expense      
Advertising and marketing expense $ 1,165 $ 1,208 $ 1,099
Accounting and auditing expenses 837 818 690
ATM and interchange expense 995 886 853
ATM and debit card income      
Other operating income      
ATM and debit card income $ 3,556 $ 3,378 $ 3,024