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Other Income and Operating Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Other Income and Expenses [Abstract]        
Reporting threshold for other income and operating expenses (percent, greater than)     1.00%  
Noninterest Income        
Other service charges $ 742 $ 619 $ 2,289 $ 1,986
Increase in cash surrender value of corporate owned life insurance 456 489 1,644 1,615
Other income 568 637 1,734 1,218
Total other income 1,766 1,745 5,667 4,819
Noninterest Expenses        
Marketing expense 1,107 1,248 3,523 3,566
Professional fees 1,440 1,389 4,134 4,083
Legal fees 187 313 712 992
Technology expense 1,775 1,322 4,856 3,938
Cardholder expense 735 548 2,777 1,973
Other expenses 4,614 4,425 13,736 12,982
Total other operating expense $ 9,858 $ 9,245 $ 29,738 $ 27,534