Other Noninterest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Expense Disclosure Nonoperating [Abstract]
Advertising	$ 3,253	$ 3,517	$ 6,333	$ 6,043
Corporate value and franchise taxes	4,215	3,577	8,257	7,017
Printing and supplies	1,092	1,688	2,261	2,974
Telecommunications and postage	3,363	3,615	6,829	7,465
Travel expense	1,344	1,441	2,442	2,507
Entertainment and contributions	2,742	3,193	5,450	5,711
Tax credit investment amortization	1,234	875	2,372	1,749
Other retirement expense	(4,152)	(4,458)	(8,257)	(8,921)
Loss on restructuring of bank-owned life insurance contracts		3,240		3,240
Other miscellaneous	6,588	8,830	12,279	14,514
Total other noninterest expense	$ 19,679	$ 25,518	$ 37,966	$ 42,299