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Supplementary Income Statement Information (Schedule of Components of Other Noninterest Income/Expense) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Supplementary Income Statement Information [Abstract]      
Other service charges, commissions, and fees - debit card interchange income $ 7,732 $ 6,564 $ 6,433
Other service charges, commissions, and fees - other interchange income 3,722 3,018 2,288
Other operating expenses - data processing expense 2,910 2,010 1,935
Other operating expenses - credit/debit card processing expense 2,797 2,296 2,181
Other operating expenses - marketing 2,549 1,999 1,674
Other operating expenses - outside consultants 2,511 1,700 1,677
Other operating expenses - telephone and data line expense 2,470 2,311 2,133
Other operating expenses - stationery and supplies 2,399 2,066 2,039
Other operating expenses - FDIC insurance expense 2,350 2,009 2,394
Other operating expenses - dues and subscriptions 1,889 1,604 1,710
Other operating expenses - repossession and collection 1,736 1,842 2,167
Other operating expenses - legal and audit $ 1,497 $ 1,408 $ 1,689