Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
INTEREST INCOME
Loans, including fees	$ 555,008	$ 687,771	$ 710,935
Interest bearing balances due from banks and federal funds sold	2,795	4,383	7,486
Investment securities	111,693	64,533	63,376
Mortgage loans held for sale	1,565	3,031	1,326
TOTAL INTEREST INCOME	671,061	759,718	783,123
INTEREST EXPENSE
Deposits	41,172	79,860	139,011
Federal funds purchased and securities sold under agreements to repurchase	579	1,715	1,010
Other borrowings	19,495	19,652	23,008
Subordinated notes and debentures	18,283	18,757	18,341
TOTAL INTEREST EXPENSE	79,529	119,984	181,370
NET INTEREST INCOME	591,532	639,734	601,753
Provision for credit losses	(32,704)	74,973	43,240
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	624,236	564,761	558,513
NON-INTEREST INCOME
Bank owned life insurance income	8,902	5,815	4,768
Gain on sale of securities, net	15,498	54,806	13,314
Other income	35,273	39,876	64,684
TOTAL NON-INTEREST INCOME	191,815	239,769	197,879
NON-INTEREST EXPENSE
Salaries and employee benefits	246,335	242,474	227,795
Occupancy expense, net	38,797	37,556	32,008
Furniture and equipment expense	19,890	24,038	18,220
Other real estate and foreclosure expense	2,121	1,752	3,442
Deposit insurance	6,973	9,184	4,416
Merger related costs	15,911	4,531	36,379
Other operating expenses	153,562	165,201	131,700
TOTAL NON-INTEREST EXPENSE	483,589	484,736	453,960
INCOME BEFORE INCOME TAXES	332,462	319,794	302,432
Provision for income taxes	61,306	64,890	64,265
NET INCOME	271,156	254,904	238,167
Preferred stock dividends	47	52	339
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 271,109	$ 254,852	$ 237,828
Basic earnings per share (in dollars per share)	$ 2.47	$ 2.32	$ 2.42
Diluted earnings per share (in dollars per share)	$ 2.46	$ 2.31	$ 2.41
Wealth management fees
NON-INTEREST INCOME
NON-INTEREST INCOME	$ 31,172	$ 30,386	$ 27,353
Service charges on deposit accounts
NON-INTEREST INCOME
NON-INTEREST INCOME	43,231	43,082	44,782
Other service charges and fees
NON-INTEREST INCOME
NON-INTEREST INCOME	7,696	6,624	5,824
Mortgage lending income
NON-INTEREST INCOME
NON-INTEREST INCOME	21,798	34,469	15,017
Debit and credit card fees
NON-INTEREST INCOME
NON-INTEREST INCOME	$ 28,245	$ 24,711	$ 22,137