Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
INTEREST INCOME
Loans, including fees	$ 694,192	$ 555,008	$ 687,771
Interest bearing balances due from banks and federal funds sold	5,500	2,795	4,383
Investment securities	158,203	111,693	64,533
Mortgage loans held for sale	720	1,565	3,031
Other loans held for sale	3,120	0	0
TOTAL INTEREST INCOME	861,735	671,061	759,718
INTEREST EXPENSE
Deposits	99,049	41,172	79,860
Federal funds purchased and securities sold under agreements to repurchase	941	579	1,715
Other borrowings	24,934	19,495	19,652
Subordinated notes and debentures	19,495	18,283	18,757
TOTAL INTEREST EXPENSE	144,419	79,529	119,984
NET INTEREST INCOME	717,316	591,532	639,734
Provision for credit losses	14,074	(32,704)	74,973
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	703,242	624,236	564,761
NONINTEREST INCOME
Bank owned life insurance income	11,146	8,902	5,815
Gain (loss) on sale of securities, net	(278)	15,498	54,806
Gain on insurance settlement	4,074	0	0
Other income	27,361	35,273	39,876
TOTAL NONINTEREST INCOME	170,066	191,815	239,769
NONINTEREST EXPENSE
Salaries and employee benefits	286,982	246,335	242,474
Occupancy expense, net	44,321	38,797	37,556
Furniture and equipment expense	20,665	19,890	24,038
Other real estate and foreclosure expense	1,003	2,121	1,752
Deposit insurance	11,608	6,973	9,184
Merger related costs	22,476	15,911	4,531
Other operating expenses	179,693	153,562	165,201
TOTAL NONINTEREST EXPENSE	566,748	483,589	484,736
INCOME BEFORE INCOME TAXES	306,560	332,462	319,794
Provision for income taxes	50,148	61,306	64,890
NET INCOME	256,412	271,156	254,904
Preferred stock dividends	0	47	52
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 256,412	$ 271,109	$ 254,852
BASIC EARNINGS PER SHARE (in dollars per share)	$ 2.07	$ 2.47	$ 2.32
DILUTED EARNINGS PER SHARE (in dollars per share)	$ 2.06	$ 2.46	$ 2.31
Service charges on deposit accounts
NONINTEREST INCOME
Non-interest income	$ 46,527	$ 43,231	$ 43,082
Debit and credit card fees
NONINTEREST INCOME
Non-interest income	31,203	28,245	24,711
Wealth management fees
NONINTEREST INCOME
Non-interest income	31,895	31,172	30,386
Mortgage lending income
NONINTEREST INCOME
Non-interest income	10,522	21,798	34,469
Other service charges and fees
NONINTEREST INCOME
Non-interest income	$ 7,616	$ 7,696	$ 6,624