Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest income
Interest and fees on loans	$ 1,172,162	$ 834,969	$ 676,089
Interest on taxable securities	59,002	34,656	22,524
Interest on nontaxable securities	1,335	1,176	575
Interest on deposits in other banks	47,936	23,008	3,882
Interest on federal funds sold	0	77	42
Total interest income	1,280,435	893,886	703,112
Interest expense
Interest on deposits	356,017	56,105	22,357
Interest on other borrowings	89,374	36,755	25,428
Total interest expense	445,391	92,860	47,785
Net interest income	835,044	801,026	655,327
Provision for loan losses	153,515	52,610	(35,081)
Provision for unfunded commitments	(10,853)	19,226	332
Provision for other credit losses	(6)	(139)	(616)
Provision for credit losses	142,656	71,697	(35,365)
Net interest income after provision for credit losses	692,388	729,329	690,692
Noninterest income
Service charges on deposit accounts	46,575	44,499	45,106
Mortgage banking activity	139,885	184,904	285,900
Other service charges, commissions and fees	4,401	3,875	4,188
Net gain (loss) on securities	(304)	203	515
Gain on sale of SBA loans	1,557	5,552	6,623
Other noninterest income	50,714	45,391	23,212
Total noninterest income	242,828	284,424	365,544
Noninterest expense
Salaries and employee benefits	320,110	319,719	337,776
Occupancy and equipment	51,450	51,361	48,066
Advertising and marketing	11,856	12,481	8,434
Amortization of intangible assets	18,244	19,744	14,965
Data processing and communications expenses	53,486	49,228	45,976
Legal and other professional fees	17,726	16,439	11,920
Credit resolution-related expenses	80	29	3,538
Merger and conversion charges	0	1,212	4,206
FDIC insurance	26,940	8,063	5,614
Loan servicing expenses	35,283	36,835	26,481
Other noninterest expenses	43,106	45,544	53,148
Total noninterest expense	578,281	560,655	560,124
Income before income tax expense	356,935	453,098	496,112
Income tax expense	87,830	106,558	119,199
Net income	$ 269,105	$ 346,540	$ 376,913
Basic earnings per common share (in dollars per share)	$ 3.90	$ 5.01	$ 5.43
Diluted earnings per common share (in dollars per share)	$ 3.89	$ 4.99	$ 5.40
Weighted average common shares outstanding
Basic (in shares)	68,977,453	69,193,591	69,431,860
Diluted (in shares)	69,104,158	69,419,721	69,761,394