Consolidated Statements of Income and Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Interest income
Interest and fees on loans	$ 325,622	$ 304,699	$ 946,679	$ 868,675
Interest on taxable securities	15,555	14,754	45,595	44,969
Interest on nontaxable securities	336	331	1,001	1,009
Interest on deposits in other banks and federal funds sold	13,633	10,769	38,646	33,568
Total interest income	355,146	330,553	1,031,921	948,221
Interest expense
Interest on deposits	129,698	102,999	369,117	244,268
Interest on other borrowings	11,388	19,803	35,435	75,010
Total interest expense	141,086	122,802	404,552	319,278
Net interest income	214,060	207,751	627,369	628,943
Provision for loan losses	6,313	30,095	57,184	123,114
Provision for unfunded commitments	(204)	(5,634)	(11,196)	(3,415)
Provision for other credit losses	(2)	(2)	(3)	5
Provision for credit losses	6,107	24,459	45,985	119,704
Net interest income after provision for credit losses	207,953	183,292	581,384	509,239
Noninterest income
Service charges on deposit accounts	12,918	12,092	37,349	34,323
Mortgage banking activity	37,947	36,290	123,776	108,424
Other service charges, commissions and fees	1,163	1,221	3,576	3,167
Net gain (loss) on securities	(8)	(16)	12,320	(16)
Other noninterest income	17,689	13,594	47,277	40,682
Total noninterest income	69,709	63,181	224,298	186,580
Noninterest expense
Salaries and employee benefits	88,700	81,898	259,831	244,144
Occupancy and equipment	11,716	12,745	37,160	38,253
Data processing and communications expenses	15,221	12,973	45,068	39,458
Credit resolution-related expenses	(110)	(1,360)	1,216	(77)
Advertising and marketing	4,089	2,723	10,205	8,882
Amortization of intangible assets	4,180	4,425	13,009	13,819
Loan servicing expense	8,626	9,290	27,857	26,392
Other noninterest expenses	19,355	18,752	61,499	58,399
Total noninterest expense	151,777	141,446	455,845	429,270
Income before income tax expense	125,885	105,027	349,837	266,549
Income tax expense	26,673	24,912	85,528	63,378
Net income	99,212	80,115	264,309	203,171
Other comprehensive income (loss)
Net unrealized holding gains (losses) arising during period on debt securities available-for-sale, net of tax expense (benefit) of $7,427, $(3,472), $6,710 and $(4,871)	22,296	(10,200)	20,215	(14,311)
Total other comprehensive income (loss)	22,296	(10,200)	20,215	(14,311)
Comprehensive income	$ 121,508	$ 69,915	$ 284,524	$ 188,860
Basic earnings per common share (in dollars per share)	$ 1.44	$ 1.16	$ 3.84	$ 2.94
Diluted earnings per common share (in dollars per share)	$ 1.44	$ 1.16	$ 3.83	$ 2.94
Weighted average common shares outstanding
Basic (in shares)	68,798,093	68,879,352	68,811,727	69,023,201
Diluted (in shares)	69,066,298	68,994,247	69,031,666	69,129,921