Other Noninterest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Expense Disclosure Nonoperating [Abstract]
Advertising	$ 5,435	$ 2,553	$ 11,768	$ 8,596
Corporate value and franchise taxes	4,109	3,718	12,366	10,735
Telecommunications and postage	3,610	3,598	10,439	11,063
Entertainment and contributions	2,765	2,539	8,215	8,250
Printing and supplies	1,459	1,287	3,720	4,261
Travel expense	1,172	1,365	3,614	3,872
Tax credit investment amortization	1,286	1,560	3,658	3,309
Other retirement expense	(4,152)	(4,664)	(12,409)	(13,585)
Loss on restructuring of bank-owned life insurance contracts				3,240
Other miscellaneous	17,374	6,297	29,653	20,811
Total other noninterest expense	$ 33,058	$ 18,253	$ 71,024	$ 60,552