CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
INTEREST INCOME:
Interest and fees on loans	$ 697,997	$ 477,970	$ 444,137
Interest on securities:
Taxable	223,521	169,544	125,010
Nontaxable	25,268	24,006	19,268
Interest on federal funds sold	3	11	1
Interest on interest bearing deposits in other financial institutions	7,007	3,125	344
TOTAL INTEREST INCOME	953,796	674,656	588,760
INTEREST EXPENSE:
Interest on deposits	319,688	56,880	14,797
Interest on borrowings	10,311	2,717	471
Interest on term debt (includes $575, $246, and $(1,601) of interest (income) expense related to derivatives reclassified from accumulated other comprehensive income (loss) for the years ended December 31, 2023, 2022, and 2021, respectively)	22,560	16,823	12,932
TOTAL INTEREST EXPENSE	352,559	76,420	28,200
NET INTEREST INCOME	601,237	598,236	560,560
Provision (benefit) for credit losses	21,707	15,370	(17,575)
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	579,530	582,866	578,135
NONINTEREST INCOME:
Revenue from contract with customers	97,533	93,587	87,666
Loan servicing income	1,561	2,741	3,276
Capital markets fees	10,007	11,543	1,324
Securities (losses) gains, net (includes $(141,377), $(1,892), and $5,910 of net security gains (losses) reclassified from accumulated other comprehensive income (loss) for the years ended December 31, 2023, 2022, and 2021, respectively)	(141,539)	(425)	5,910
Unrealized (loss) gain on equity securities, net	240	(622)	58
Net gains on sale of loans held for sale	3,880	9,032	20,605
Valuation adjustment on servicing rights	0	1,658	1,088
Income on bank owned life insurance	3,771	2,341	3,762
Other noninterest income	3,621	8,409	5,246
TOTAL NONINTEREST INCOME (LOSS)	(20,926)	128,264	128,935
NONINTEREST EXPENSES:
Salaries and employee benefits	251,276	254,478	240,114
Occupancy	26,847	28,155	29,965
Furniture and equipment	11,599	12,499	13,323
Professional fees	58,667	58,606	58,843
FDIC insurance assessments	19,940	7,000	5,757
Advertising	8,347	6,221	7,257
Core deposit intangibles and customer relationship intangibles amortization	6,739	7,834	9,395
Other real estate and loan collection expenses	1,489	950	990
(Gain) loss on sales/valuations of assets, net	(77)	(1,047)	588
Acquisition, integration and restructuring costs	10,359	7,586	5,331
Partnership investment in tax credit projects	5,401	5,040	6,303
Other noninterest expenses	61,240	56,055	53,946
TOTAL NONINTEREST EXPENSES	461,827	443,377	431,812
INCOME BEFORE INCOME TAXES	96,777	267,753	275,258
Income taxes (includes $(43,560), $(355), and $1,896 of income tax expense (benefit) reclassified from accumulated other comprehensive income (loss) for the years ended December 31, 2023, 2022, and 2021, respectively)	16,857	55,573	55,335
NET INCOME	79,920	212,180	219,923
Preferred dividends	(8,050)	(8,050)	(8,050)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 71,870	$ 204,130	$ 211,873
EARNINGS PER COMMON SHARE - BASIC (in dollars per share)	$ 1.68	$ 4.80	$ 5.01
EARNINGS PER COMMON SHARE - DILUTED (in dollars per share)	1.68	4.79	5.00
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 1.20	$ 1.09	$ 0.96
Service charges and fees
NONINTEREST INCOME:
Revenue from contract with customers	$ 74,024	$ 68,031	$ 59,703
Trust fees
NONINTEREST INCOME:
Revenue from contract with customers	20,715	22,570	24,417
Brokerage and insurance commissions
NONINTEREST INCOME:
Revenue from contract with customers	$ 2,794	$ 2,986	$ 3,546