CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
INTEREST INCOME:
Interest and fees on loans	$ 111,915	$ 107,005	$ 224,354	$ 213,419
Interest on securities:
Taxable	31,546	23,362	61,989	45,093
Nontaxable	4,561	3,344	9,064	5,527
Interest on federal funds sold	0	0	1	0
Interest on interest bearing deposits in other financial institutions	60	54	126	775
TOTAL INTEREST INCOME	148,082	133,765	295,534	264,814
INTEREST EXPENSE:
Interest on deposits	3,790	6,134	8,185	20,716
Interest on short-term borrowings	98	61	250	357
Interest on other borrowings (includes $(461) and $(423) of interest expense related to derivatives reclassified from accumulated other comprehensive income (loss) for the three months ended June 30, 2021 and 2020, respectively, and $(1,058) and $(613) of interest expense related to derivatives reclassified from accumulated other comprehensive income (loss) for the six months ended June 30, 2021 and 2020, respectively)	2,976	3,424	6,276	7,084
TOTAL INTEREST EXPENSE	6,864	9,619	14,711	28,157
NET INTEREST INCOME	141,218	124,146	280,823	236,657
Provision (benefit) for credit losses	(7,080)	26,796	(7,728)	48,316
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	148,298	97,350	288,551	188,341
NONINTEREST INCOME:
Revenue from contract with customers	22,036	16,544	42,337	34,320
Loan servicing income	873	379	1,711	1,342
Securities gains, net (includes $2,842 and $2,006 of net security gains reclassified from accumulated other comprehensive income (loss) for the three months ended June 30, 2021 and 2020, respectively, and $2,812 and $3,664 of net security gains reclassified from accumulated other comprehensive income (loss) for the six months ended June 30, 2021 and 2020, respectively)	2,842	2,006	2,812	3,664
Unrealized gain (loss) on equity securities, net	83	680	(27)	449
Net gains on sale of loans held for sale	4,753	7,857	11,173	12,517
Valuation adjustment on servicing rights	(526)	9	391	(1,556)
Income on bank owned life insurance	937	1,167	1,766	1,665
Other noninterest income	2,166	1,995	3,318	4,053
TOTAL NONINTEREST INCOME	33,164	30,637	63,481	56,454
NONINTEREST EXPENSES:
Salaries and employee benefits	57,332	50,118	116,394	100,075
Occupancy	7,399	6,502	15,317	12,973
Furniture and equipment	3,501	2,993	6,594	6,101
Professional fees	16,237	13,676	29,727	26,149
Advertising	1,649	995	3,118	3,200
Core deposit and customer relationship intangibles amortization	2,415	2,696	4,931	5,677
Other real estate and loan collection expenses	414	203	549	537
Loss on sales/valuations of assets, net	183	701	377	717
Acquisition, integration and restructuring costs	210	673	3,138	2,049
Partnership investment in tax credit projects	1,345	791	1,380	975
Other noninterest expenses	12,691	11,091	24,274	22,845
TOTAL NONINTEREST EXPENSES	103,376	90,439	205,799	181,298
INCOME BEFORE INCOME TAXES	78,086	37,548	146,233	63,497
Income taxes (includes $834 and $614 of income tax expense reclassified from accumulated other comprehensive income (loss) for the three months ended June 30, 2021 and 2020, respectively, and $977 and $1,080 of income tax expense reclassified from accumulated other comprehensive income (loss) for the six months ended June 30, 2021 and 2020, respectively)	16,481	7,417	31,814	13,326
NET INCOME	61,605	30,131	114,419	50,171
Preferred dividends	(2,012)	0	(4,025)	0
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 59,593	$ 30,131	$ 110,394	$ 50,171
EARNINGS PER COMMON SHARE - BASIC (in dollars per share)	$ 1.41	$ 0.82	$ 2.62	$ 1.36
EARNINGS PER COMMON SHARE - DILUTED (in dollars per share)	1.41	0.82	2.61	1.36
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.22	$ 0.20	$ 0.44	$ 0.40
Service charges and fees
NONINTEREST INCOME:
Revenue from contract with customers	$ 15,132	$ 10,972	$ 28,803	$ 22,993
Trust fees
NONINTEREST INCOME:
Revenue from contract with customers	6,039	4,977	11,816	9,999
Brokerage and insurance commissions
NONINTEREST INCOME:
Revenue from contract with customers	$ 865	$ 595	$ 1,718	$ 1,328