Other Noninterest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Other Expense Disclosure Nonoperating [Abstract]
Advertising	$ 3,159	$ 5,435	$ 10,089	$ 11,768
Corporate value and franchise taxes	4,872	4,109	13,649	12,366
Telecommunications and postage	4,043	3,610	11,483	10,439
Entertainment and contributions	1,315	2,765	7,146	8,215
Travel expense	309	1,172	1,816	3,614
Printing and supplies	1,271	1,459	4,006	3,720
Tax credit investment amortization	961	1,286	2,882	3,658
Net other retirement expense (income)	(6,337)	(4,152)	(18,796)	(12,409)
Other miscellaneous	5,105	17,374	17,751	29,653
Total other noninterest expense	$ 14,698	$ 33,058	$ 50,026	$ 71,024