Other Noninterest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Expense Disclosure Nonoperating [Abstract]
Corporate value and franchise taxes	$ 3,422	$ 4,481	$ 7,886	$ 8,777
Telecommunications and postage	3,163	3,374	6,481	7,440
Advertising	2,276	2,696	4,762	6,930
Entertainment and contributions	1,487	3,384	2,934	5,831
Tax credit investment amortization	1,112	961	2,225	1,921
Printing and supplies	941	1,627	1,919	2,735
Travel expense	667	396	1,024	1,507
Net other retirement expense	(6,806)	(6,337)	(13,351)	(12,459)
Loss on facilities and equipment from consolidation	15,462		15,462	929
Loss on extinguishment of debt	4,165		4,165
Other miscellaneous	6,396	5,177	12,526	11,717
Total other noninterest expense	$ 32,285	$ 15,759	$ 46,033	$ 35,328