Consolidated Statements of Income and Comprehensive Income (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest income
Interest and fees on loans	$ 304,699	$ 216,400	$ 868,675	$ 584,706
Interest on taxable securities	14,754	10,324	44,969	21,627
Interest on nontaxable securities	331	363	1,009	818
Interest on deposits in other banks and federal funds sold	10,769	7,215	33,568	13,093
Total interest income	330,553	234,302	948,221	620,244
Interest expense
Interest on deposits	102,999	14,034	244,268	23,034
Interest on other borrowings	19,803	7,287	75,010	20,321
Total interest expense	122,802	21,321	319,278	43,355
Net interest income	207,751	212,981	628,943	576,889
Provision for loan losses	30,095	17,469	123,114	27,962
Provision for unfunded commitments	(5,634)	192	(3,415)	10,980
Provision for other credit losses	(2)	(9)	5	(135)
Provision for credit losses	24,459	17,652	119,704	38,807
Net interest income after provision for credit losses	183,292	195,329	509,239	538,082
Noninterest income
Service charges on deposit accounts	12,092	11,168	34,323	33,374
Mortgage banking activity	36,290	40,350	108,424	162,049
Other service charges, commissions and fees	1,221	970	3,167	2,907
Net gain (loss) on securities	(16)	(21)	(16)	200
Other noninterest income	13,594	12,857	40,682	37,546
Total noninterest income	63,181	65,324	186,580	236,076
Noninterest expense
Salaries and employee benefits	81,898	78,697	244,144	244,523
Occupancy and equipment	12,745	12,983	38,253	38,456
Data processing and communications expenses	12,973	12,015	39,458	36,742
Credit resolution-related expenses	(1,360)	126	(77)	(343)
Advertising and marketing	2,723	3,553	8,882	8,663
Amortization of intangible assets	4,425	4,710	13,819	15,035
Merger and conversion charges	0	0	0	977
Loan servicing expense	9,290	9,613	26,392	28,452
Other noninterest expenses	18,752	17,881	58,399	53,089
Total noninterest expense	141,446	139,578	429,270	425,594
Income before income tax expense	105,027	121,075	266,549	348,564
Income tax expense	24,912	28,520	63,378	84,245
Net income	80,115	92,555	203,171	264,319
Other comprehensive loss
Net unrealized holding losses arising during period on debt securities available-for-sale, net of tax benefit of $(3,472), $(10,128), $(4,871) and $(17,631)	(10,200)	(38,099)	(14,311)	(66,324)
Total other comprehensive loss	(10,200)	(38,099)	(14,311)	(66,324)
Comprehensive income	$ 69,915	$ 54,456	$ 188,860	$ 197,995
Basic earnings per common share (in dollars per share)	$ 1.16	$ 1.34	$ 2.94	$ 3.82
Diluted earnings per common share (in dollars per share)	$ 1.16	$ 1.34	$ 2.94	$ 3.81
Weighted average common shares outstanding
Basic (in shares)	68,879	69,125	69,023	69,213
Diluted (in shares)	68,994	69,327	69,130	69,428