Other Income and Operating Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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	$ 836	$ 742	$ 2,366	$ 2,289
Increase in cash surrender value of corporate owned life insurance	499	456	1,519	1,644
Net (loss) gain on sale of fixed assets	(11)	(2)	2,954	19
Other income	733	570	1,904	1,715
Total other income	2,057	1,766	8,743	5,667
Noninterest Expenses
Marketing expense	1,246	1,107	3,801	3,523
Professional fees	1,901	1,440	5,490	4,134
Legal fees	341	187	841	712
Software, license, and maintenance	1,911	1,775	6,219	4,856
Cardholder expense	909	735	2,351	2,777
Other expenses	5,473	4,614	16,123	13,736
Total other operating expense	$ 11,781	$ 9,858	$ 34,825	$ 29,738