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14. Other Operating Income and Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Operating Income And Expense Details      
Visa debit card income $ 3,757 $ 3,589 $ 3,452
Net appraisal management fee income 780 886 635
Insurance and brokerage commissions 761 632 714
Advertising 1,195 1,136 784
FDIC insurance 347 494 681
Visa debit card expense 1,248 1,140 988
Telephone 855 754 588
Foreclosure/OREO expense 46 120 398
Internet banking expense 720 710 671
FHLB advance prepayment penalty 508 1,260 504
Consulting $ 785 $ 2,257 $ 904