Parent Company Financial Statements - Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Expenses
Professional services	$ 24,477	$ 18,902	$ 15,958
Charitable contributions	0	95,272	12,905
Other	2,478	25,177	26,339
Total noninterest expense	443,956	504,923	412,684
Income tax expense	34,047	13,163	39,481
Net income	154,665	22,738	135,098
Parent
Expenses
Professional services	7,393	1,485	360
Charitable contributions	0	91,287	0
Other	222	151	105
Total noninterest expense	7,615	92,923	465
Loss before income taxes and equity in undistributed income of subsidiaries	(7,615)	(92,923)	(465)
Income tax expense	(11,344)	(13,933)	(131)
Income (loss) before equity in undistributed income of subsidiaries	3,729	(78,990)	(334)
Equity in undistributed income of subsidiaries	150,936	101,728	135,432
Net income	$ 154,665	$ 22,738	$ 135,098