Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
INTEREST INCOME
Loans, including fees	$ 132,216	$ 163,180	$ 417,444	$ 527,656
Interest bearing balances due from banks and federal funds sold	763	623	2,212	3,667
Investment securities	30,717	14,910	79,418	47,326
Mortgage loans held for sale	230	1,012	1,255	1,961
TOTAL INTEREST INCOME	163,926	179,725	500,329	580,610
INTEREST EXPENSE
Deposits	9,116	16,206	33,077	65,489
Federal funds purchased and securities sold under agreements to repurchase	70	335	507	1,431
Other borrowings	4,893	4,943	14,592	14,783
Subordinated notes and debentures	4,610	4,631	13,702	14,133
TOTAL INTEREST EXPENSE	18,689	26,115	61,878	95,836
NET INTEREST INCOME	145,237	153,610	438,451	484,774
Provision for credit loss expense	(19,890)	22,981	(31,396)	68,030
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	165,127	130,629	469,847	416,744
NON-INTEREST INCOME
Investment banking income	732	557	2,081	2,005
Bank owned life insurance income	2,573	1,591	6,134	4,334
Gain on sale of securities, net	5,248	22,305	15,846	54,790
Other income	6,220	5,380	24,590	27,990
TOTAL NON-INTEREST INCOME	48,550	69,479	145,214	198,008
NON-INTEREST EXPENSE
Salaries and employee benefits	61,902	61,144	182,503	186,712
Occupancy expense, net	9,361	9,647	27,764	28,374
Furniture and equipment expense	4,895	6,231	15,169	18,098
Other real estate and foreclosure expense	339	602	1,545	1,201
Deposit insurance	1,870	2,244	4,865	7,557
Merger related costs	1,401	902	2,320	3,800
Other operating expenses	34,565	35,807	107,826	113,154
TOTAL NON-INTEREST EXPENSE	114,333	116,577	341,992	358,896
INCOME BEFORE INCOME TAXES	99,344	83,531	273,069	255,856
Provision for income taxes	18,770	17,633	50,151	53,920
NET INCOME	80,574	65,898	222,918	201,936
Preferred stock dividends	13	13	39	39
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 80,561	$ 65,885	$ 222,879	$ 201,897
BASIC EARNINGS PER SHARE (in dollars per share)	$ 0.75	$ 0.60	$ 2.06	$ 1.83
DILUTED EARNINGS PER SHARE (in dollars per share)	$ 0.74	$ 0.60	$ 2.05	$ 1.83
Trust income
NON-INTEREST INCOME
Non-interest income	$ 7,145	$ 6,744	$ 21,049	$ 21,148
Service charges on deposit accounts
NON-INTEREST INCOME
Non-interest income	11,557	10,385	31,322	32,283
Other service charges and fees
NON-INTEREST INCOME
Non-interest income	1,964	1,764	5,934	4,841
Mortgage lending income
NON-INTEREST INCOME
Non-interest income	5,818	13,971	16,755	31,476
SBA lending income
NON-INTEREST INCOME
Non-interest income	191	304	718	845
Debit and credit card fees
NON-INTEREST INCOME
Non-interest income	$ 7,102	$ 6,478	$ 20,785	$ 18,296