Consolidated Statements of Income and Comprehensive Income (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Interest income
Interest and fees on loans	$ 216,400	$ 166,358	$ 584,706	$ 505,276
Interest on taxable securities	10,324	5,296	21,627	16,658
Interest on nontaxable securities	363	139	818	419
Interest on deposits in other banks and federal funds sold	7,215	1,253	13,093	2,394
Total interest income	234,302	173,046	620,244	524,747
Interest expense
Interest on deposits	14,034	5,106	23,034	17,679
Interest on other borrowings	7,287	6,279	20,321	18,578
Total interest expense	21,321	11,385	43,355	36,257
Net interest income	212,981	161,661	576,889	488,490
Provision for loan losses	17,469	(3,984)	27,962	(21,462)
Provision for unfunded commitments	192	(5,516)	10,980	(16,056)
Provision for other credit losses	(9)	(175)	(135)	(606)
Provision for credit losses	17,652	(9,675)	38,807	(38,124)
Net interest income after provision for credit losses	195,329	171,336	538,082	526,614
Noninterest income
Service charges on deposit accounts	11,168	11,486	33,374	33,322
Mortgage banking activity	40,350	56,460	162,049	225,177
Other service charges, commissions and fees	970	1,154	2,907	3,226
Net gain (loss) on securities	(21)	530	200	519
Other noninterest income	12,857	6,932	37,546	21,531
Total noninterest income	65,324	76,562	236,076	283,775
Noninterest expense
Salaries and employee benefits	78,697	79,671	244,523	261,161
Occupancy and equipment	12,983	11,979	38,456	34,572
Data processing and communications expenses	12,015	10,681	36,742	34,442
Credit resolution-related expenses	126	377	(343)	1,546
Advertising and marketing	3,553	2,676	8,663	6,053
Amortization of intangible assets	4,710	3,387	15,035	11,578
Merger and conversion charges	0	183	977	183
Loan servicing expense	9,613	7,400	28,452	18,214
Other noninterest expenses	17,881	20,842	53,089	54,006
Total noninterest expense	139,578	137,196	425,594	421,755
Income before income tax expense	121,075	110,702	348,564	388,634
Income tax expense	28,520	29,022	84,245	93,665
Net income	92,555	81,680	264,319	294,969
Other comprehensive loss
Net unrealized holding losses arising during period on investment securities available-for-sale, net of tax benefit of $(10,128), $(834), $(17,631) and $(3,089)	(38,099)	(3,139)	(66,324)	(11,620)
Total other comprehensive loss	(38,099)	(3,139)	(66,324)	(11,620)
Comprehensive income	$ 54,456	$ 78,541	$ 197,995	$ 283,349
Basic earnings per common share (in dollars per share)	$ 1.34	$ 1.18	$ 3.82	$ 4.25
Diluted earnings per common share (in dollars per share)	$ 1.34	$ 1.17	$ 3.81	$ 4.23
Weighted average common shares outstanding
Basic (in shares)	69,125	69,440	69,213	69,445
Diluted (in shares)	69,327	69,756	69,428	69,772