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Other Operating Income and Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other operating expense      
Advertising and marketing expense $ 983 $ 1,174 $ 1,165
Accounting and auditing expenses 788 828 837
ATM and interchange expense 1,253 1,176 995
Swap termination expense 1,756 0 0
ATM and debit card income      
Other operating income      
Other operating income 4,138 3,956 3,556
Loan processing fees      
Other operating income      
Other operating income $ 1,200 $ 812 $ 711