CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
INTEREST INCOME:
Interest and fees on loans	$ 477,970	$ 444,137	$ 424,941
Interest on securities:
Taxable	169,544	125,010	98,263
Nontaxable	24,006	19,268	12,484
Interest on federal funds sold	11	1	0
Interest on interest bearing deposits in other financial institutions	3,125	344	924
TOTAL INTEREST INCOME	674,656	588,760	536,612
INTEREST EXPENSE:
Interest on deposits	56,880	14,797	30,287
Interest on short-term borrowings	2,717	471	610
Interest on other borrowings (includes $246, $1,601, and $(1,820) of interest expense (benefit) related to derivatives reclassified from accumulated other comprehensive income (loss) for the years ended December 31, 2022, 2021, and 2020, respectively)	16,823	12,932	13,986
TOTAL INTEREST EXPENSE	76,420	28,200	44,883
NET INTEREST INCOME	598,236	560,560	491,729
Provision (benefit) for credit losses	15,370	(17,575)	67,066
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	582,866	578,135	424,663
NONINTEREST INCOME:
Revenue from contract with customers	93,587	87,666	71,085
Loan servicing income	2,741	3,276	2,977
Securities (losses) gains, net (includes $(1,892), $5,910, and $7,592 of net security gains (losses) reclassified from accumulated other comprehensive income (loss) for the years ended December 31, 2022, 2021, and 2020, respectively)	(425)	5,910	7,793
Unrealized (loss) gain on equity securities, net	(622)	58	640
Net gains on sale of loans held for sale	9,032	20,605	28,515
Valuation adjustment on servicing rights	1,658	1,088	(1,778)
Income on bank owned life insurance	2,341	3,762	3,554
Other noninterest income	19,952	6,570	7,505
TOTAL NONINTEREST INCOME	128,264	128,935	120,291
NONINTEREST EXPENSES:
Salaries and employee benefits	254,478	240,114	202,668
Occupancy	28,155	29,965	26,554
Furniture and equipment	12,499	13,323	12,514
Professional fees	65,606	64,600	54,068
Advertising	6,221	7,257	5,235
Core deposit intangibles and customer relationship intangibles amortization	7,834	9,395	10,670
Other real estate and loan collection expenses	950	990	1,340
(Gain) loss on sales/valuations of assets, net	(1,047)	588	5,101
Acquisition, integration and restructuring costs	7,586	5,331	5,381
Partnership investment in tax credit projects	5,040	6,303	3,801
Other noninterest expenses	56,055	53,946	43,631
TOTAL NONINTEREST EXPENSES	443,377	431,812	370,963
INCOME BEFORE INCOME TAXES	267,753	275,258	173,991
Income taxes (includes $(355), $1,896, and $2,376 of income tax expense (benefit) reclassified from accumulated other comprehensive income (loss) for the years ended December 31, 2022, 2021, and 2020, respectively)	55,573	55,335	36,053
NET INCOME	212,180	219,923	137,938
Preferred dividends	(8,050)	(8,050)	(4,451)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 204,130	$ 211,873	$ 133,487
EARNINGS PER COMMON SHARE - BASIC (in dollars per share)	$ 4.80	$ 5.01	$ 3.58
EARNINGS PER COMMON SHARE - DILUTED (in dollars per share)	4.79	5.00	3.57
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 1.09	$ 0.96	$ 0.80
Service charges and fees
NONINTEREST INCOME:
Revenue from contract with customers	$ 68,031	$ 59,703	$ 47,467
Trust fees
NONINTEREST INCOME:
Revenue from contract with customers	22,570	24,417	20,862
Brokerage and insurance commissions
NONINTEREST INCOME:
Revenue from contract with customers	$ 2,986	$ 3,546	$ 2,756