Consolidated Statements of Income and Comprehensive Income (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Interest income
Interest and fees on loans	$ 190,740	$ 167,761	$ 368,306	$ 338,918
Interest on taxable securities	7,064	5,244	11,303	11,362
Interest on nontaxable securities	269	139	455	280
Interest on deposits in other banks and federal funds sold	4,495	607	5,878	1,141
Total interest income	202,568	173,751	385,942	351,701
Interest expense
Interest on deposits	4,908	5,775	9,000	12,573
Interest on other borrowings	6,296	6,124	13,034	12,299
Total interest expense	11,204	11,899	22,034	24,872
Net interest income	191,364	161,852	363,908	326,829
Provision for loan losses	13,227	(899)	10,493	(17,478)
Provision for unfunded commitments	1,779	1,299	10,788	(10,540)
Provision for other credit losses	(82)	(258)	(126)	(431)
Provision for credit losses	14,924	142	21,155	(28,449)
Net interest income after provision for credit losses	176,440	161,710	342,753	355,278
Noninterest income
Service charges on deposit accounts	11,148	11,007	22,206	21,836
Mortgage banking activity	58,761	70,231	121,699	168,717
Other service charges, commissions and fees	998	1,056	1,937	2,072
Net loss on securities	248	1	221	(11)
Other noninterest income	12,686	6,945	24,689	14,599
Total noninterest income	83,841	89,240	170,752	207,213
Noninterest expense
Salaries and employee benefits	81,545	85,505	165,826	181,490
Occupancy and equipment	12,746	10,812	25,473	22,593
Data processing and communications expenses	12,155	11,877	24,727	23,761
Credit resolution-related expenses	496	622	(469)	1,169
Advertising and marketing	3,122	1,946	5,110	3,377
Amortization of intangible assets	5,144	4,065	10,325	8,191
Merger and conversion charges	0	0	977	0
Loan servicing expense	9,920	4,914	18,839	10,814
Other noninterest expenses	17,068	16,020	35,208	33,164
Total noninterest expense	142,196	135,761	286,016	284,559
Income before income tax expense	118,085	115,189	227,489	277,932
Income tax expense	28,019	26,862	55,725	64,643
Net income	90,066	88,327	171,764	213,289
Other comprehensive loss
Net unrealized holding losses arising during period on investment securities available-for-sale, net of tax benefit of $(2,870), $(283), $(7,503) and $(2,255)	(10,794)	(1,066)	(28,225)	(8,481)
Total other comprehensive loss	(10,794)	(1,066)	(28,225)	(8,481)
Comprehensive income	$ 79,272	$ 87,261	$ 143,539	$ 204,808
Basic earnings per common share (in dollars per share)	$ 1.30	$ 1.27	$ 2.48	$ 3.07
Diluted earnings per common share (in dollars per share)	$ 1.30	$ 1.27	$ 2.47	$ 3.06
Weighted average common shares outstanding
Basic (in shares)	69,136	69,497	69,246	69,448
Diluted (in shares)	69,316	69,792	69,485	69,765