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Other Income and Operating Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Other Income and Expenses [Abstract]        
Reporting threshold for other income and operating expenses (percent, greater than)     1.00%  
Noninterest Income        
Other service charges $ 722 $ 727 $ 1,531 $ 1,547
Increase in cash surrender value of corporate owned life insurance 504 557 1,020 1,188
Gain on sale of fixed assets 2,959 16 2,965 21
Other income 713 446 1,170 1,145
Total other income 4,898 1,746 6,686 3,901
Noninterest Expenses        
Marketing expense 1,414 1,242 2,555 2,416
Professional fees 1,712 1,331 3,588 2,693
Legal fees 292 260 500 524
Technology expense 1,911 1,632 3,902 3,093
Cardholder expense 810 860 1,442 2,041
Other expenses 6,296 4,645 11,056 9,161
Total other operating expense $ 12,435 $ 9,970 $ 23,043 $ 19,928