Other Noninterest Income and Other Noninterest Expense - Summary of Other Noninterest Income and Other Noninterest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other noninterest income
Insurance revenue	$ 2,677	$ 7,378	$ 7,717
Bankcard fees	5,951	7,310	7,270
Income from bank owned life insurance policies	3,450	3,313	2,954
Other	6,033	6,655	(263)
Total other noninterest income	18,111	24,656	17,678
Other noninterest expense
Net cost of operation of other real estate owned	653	2,251	3,033
Data processing expense	8,775	7,590	6,280
Consulting and professional fees	13,285	9,090	6,728
Loan related expenses	3,145	2,379	3,114
FDIC insurance	4,645	4,275	7,228
Communications	2,773	2,837	2,656
Advertising and public relations	2,523	2,048	1,369
Legal expenses	3,732	4,274	2,721
Other	27,649	25,921	27,469
Total other noninterest expense	$ 67,180	$ 60,665	$ 60,598