CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
INTEREST INCOME:
Interest and fees on loans	$ 102,657	$ 110,566	$ 316,076	$ 317,049
Interest on securities:
Taxable	25,016	18,567	70,109	50,566
Nontaxable	3,222	2,119	8,749	7,766
Interest on federal funds sold	0	0	0	4
Interest on interest bearing deposits in other financial institutions	72	2,151	847	5,742
TOTAL INTEREST INCOME	130,967	133,403	395,781	381,127
INTEREST EXPENSE:
Interest on deposits	4,962	17,982	25,678	47,333
Interest on short-term borrowings	78	250	435	1,477
Interest on other borrowings (includes $(595) and $24 of interest expense/(benefit) related to derivatives reclassified from accumulated other comprehensive income for the three months ended September 30, 2020 and 2019, respectively, and $(1,195) and $276 of interest expense/(benefit) related to derivatives reclassified from accumulated other comprehensive income for the nine months ended September 30, 2020 and 2019, respectively)	3,430	3,850	10,514	11,333
TOTAL INTEREST EXPENSE	8,470	22,082	36,627	60,143
NET INTEREST INCOME	122,497	111,321	359,154	320,984
Provision for credit losses	1,678	5,201	49,994	11,754
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	120,819	106,120	309,160	309,230
NONINTEREST INCOME:
Revenue from contract with customers	17,755	18,287	52,075	56,771
Loan servicing income	638	821	1,980	3,888
Securities gains, net (includes $1,099 and $2,013 of net security gains reclassified from accumulated other comprehensive income for the three months ended September 30, 2020 and 2019, respectively and $4,763 and $7,168 of net security gains reclassified from accumulated other comprehensive income for the nine months ended September 30, 2020 and 2019, respectively)	1,300	2,013	4,964	7,168
Unrealized gain on equity securities, net	155	144	604	514
Net gains on sale of loans held for sale	8,894	4,673	21,411	12,192
Valuation allowance on servicing rights	(120)	(626)	(1,676)	(1,579)
Income on bank owned life insurance	868	881	2,533	2,668
Other noninterest income	1,726	3,207	5,779	6,556
TOTAL NONINTEREST INCOME	31,216	29,400	87,670	88,178
NONINTEREST EXPENSES:
Salaries and employee benefits	50,978	49,927	151,053	150,107
Occupancy	6,732	6,594	19,705	19,627
Furniture and equipment	2,500	2,862	8,601	8,690
Professional fees	12,802	11,276	38,951	36,642
Advertising	928	2,622	4,128	7,551
Core deposit intangibles and customer relationship intangibles amortization	2,492	2,899	8,169	9,054
Other real estate and loan collection expenses	335	(89)	872	774
(Gain)/loss on sales/valuations of assets, net	1,763	356	2,480	(20,934)
Acquisition, integration and restructuring costs	1,146	1,500	3,195	6,043
Partnership investment in tax credit projects	927	3,052	1,902	4,992
Other noninterest expenses	9,793	11,968	32,638	33,749
TOTAL NONINTEREST EXPENSES	90,396	92,967	271,694	256,295
INCOME BEFORE INCOME TAXES	61,639	42,553	125,136	141,113
Income taxes (includes $429 and $502 of income tax expense reclassified from accumulated other comprehensive income for the three months ended September 30, 2020 and 2019, respectively and $1,509 and $1,740 of income tax expense reclassified from accumulated other comprehensive income for the nine months ended September 30, 2020 and 2019, respectively)	13,681	7,941	27,007	29,835
NET INCOME	47,958	34,612	98,129	111,278
Preferred dividends	(2,437)	0	(2,437)	0
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 45,521	$ 34,612	$ 95,692	$ 111,278
EARNINGS PER COMMON SHARE - BASIC (in dollars per share)	$ 1.23	$ 0.94	$ 2.59	$ 3.12
EARNINGS PER COMMON SHARE - DILUTED (in dollars per share)	1.23	0.94	2.59	3.11
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.20	$ 0.18	$ 0.60	$ 0.50
Service charges and fees
NONINTEREST INCOME:
Revenue from contract with customers	$ 11,749	$ 12,366	$ 34,742	$ 39,789
Trust fees
NONINTEREST INCOME:
Revenue from contract with customers	5,357	4,959	15,356	14,258
Brokerage and insurance commissions
NONINTEREST INCOME:
Revenue from contract with customers	$ 649	$ 962	$ 1,977	$ 2,724