CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
INTEREST INCOME:
Interest and fees on loans	$ 112,062	$ 102,657	$ 336,416	$ 316,076
Interest on securities:
Taxable	32,384	25,016	94,373	70,109
Nontaxable	4,609	3,222	13,673	8,749
Interest on federal funds sold	0	0	1	0
Interest on interest bearing deposits in other financial institutions	132	72	258	847
TOTAL INTEREST INCOME	149,187	130,967	444,721	395,781
INTEREST EXPENSE:
Interest on deposits	3,444	4,962	11,629	25,678
Interest on short-term borrowings	98	78	348	435
Interest on other borrowings (includes $543 and $595 of interest benefit related to derivatives reclassified from accumulated other comprehensive income (loss) for the three months ended September 30, 2021 and 2020, respectively, and $1,601 and $1,195 of interest benefit related to derivatives reclassified from accumulated other comprehensive income (loss) for the nine months ended September 30, 2021 and 2020, respectively)	3,102	3,430	9,378	10,514
TOTAL INTEREST EXPENSE	6,644	8,470	21,355	36,627
NET INTEREST INCOME	142,543	122,497	423,366	359,154
Provision (benefit) for credit losses	(4,534)	1,678	(12,262)	49,994
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	147,077	120,819	435,628	309,160
NONINTEREST INCOME:
Revenue from contract with customers	22,638	17,755	64,975	52,075
Loan servicing income	784	638	2,495	1,980
Securities gains, net (includes $1,535 and $1,099 of net security gains reclassified from accumulated other comprehensive income (loss) for the three months ended September 30, 2021 and 2020, respectively, and $4,347 and $4,763 of net security gains reclassified from accumulated other comprehensive income (loss) for the nine months ended September 30, 2021 and 2020, respectively)	1,535	1,300	4,347	4,964
Unrealized gain on equity securities, net	112	155	85	604
Net gains on sale of loans held for sale	5,281	8,894	16,454	21,411
Valuation adjustment on servicing rights	195	(120)	586	(1,676)
Income on bank owned life insurance	940	868	2,706	2,533
Other noninterest income	1,239	1,726	4,557	5,779
TOTAL NONINTEREST INCOME	32,724	31,216	96,205	87,670
NONINTEREST EXPENSES:
Salaries and employee benefits	60,689	50,978	177,083	151,053
Occupancy	7,366	6,732	22,683	19,705
Furniture and equipment	3,365	2,500	9,959	8,601
Professional fees	17,242	12,802	46,969	38,951
Advertising	1,921	928	5,039	4,128
Core deposit and customer relationship intangibles amortization	2,295	2,492	7,226	8,169
Other real estate and loan collection expenses	78	335	627	872
(Gain)/loss on sales/valuations of assets, net	(3)	1,763	374	2,480
Acquisition, integration and restructuring costs	204	1,146	3,342	3,195
Partnership investment in tax credit projects	2,374	927	3,754	1,902
Other noninterest expenses	15,096	9,793	39,370	32,638
TOTAL NONINTEREST EXPENSES	110,627	90,396	316,426	271,694
INCOME BEFORE INCOME TAXES	69,174	61,639	215,407	125,136
Income taxes (includes $524 and $429 of income tax expense reclassified from accumulated other comprehensive income (loss) for the three months ended September 30, 2021 and 2020, respectively, and $1,501 and $1,509 of income tax expense reclassified from accumulated other comprehensive income (loss) for the nine months ended September 30, 2021 and 2020, respectively)	13,250	13,681	45,064	27,007
NET INCOME	55,924	47,958	170,343	98,129
Preferred dividends	(2,013)	(2,437)	(6,038)	(2,437)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 53,911	$ 45,521	$ 164,305	$ 95,692
EARNINGS PER COMMON SHARE - BASIC (in dollars per share)	$ 1.27	$ 1.23	$ 3.89	$ 2.59
EARNINGS PER COMMON SHARE - DILUTED (in dollars per share)	1.27	1.23	3.88	2.59
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.25	$ 0.20	$ 0.69	$ 0.60
Service charges and fees
NONINTEREST INCOME:
Revenue from contract with customers	$ 15,551	$ 11,749	$ 44,354	$ 34,742
Trust fees
NONINTEREST INCOME:
Revenue from contract with customers	6,221	5,357	18,037	15,356
Brokerage and insurance commissions
NONINTEREST INCOME:
Revenue from contract with customers	$ 866	$ 649	$ 2,584	$ 1,977