Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
INTEREST INCOME
Loans, including fees	$ 467,540	$ 336,340	$ 316,124
Debt securities:
Taxable	36,838	24,456	6,327
Tax-exempt	72	93	204
Federal funds sold	226	83
Interest-bearing deposits with banks	119,260	58,848	4,366
Total interest income	623,936	419,820	327,021
INTEREST EXPENSE
Deposits	195,046	41,965	8,232
Short-term borrowings	312	60	2
Subordinated debt	4,122	4,122	3,130
Total interest expense	199,480	46,147	11,364
Net interest income	424,456	373,673	315,657
Provision for/(benefit from) credit losses	7,458	10,076	(8,690)
Net interest income after provision for (benefit from) credit losses	416,998	363,597	324,347
NONINTEREST INCOME
Securities transactions (includes accumulated other comprehensive income reclassifications of $0, $1,536 and $0, respectively	(1,828)	(1,833)	1,047
Income from sales of loans	2,607	4,548	7,282
Insurance commissions	30,615	26,883	23,745
Cash management	30,716	19,326	12,313
Gain on sale of other assets	1,603	448	2,762
Other	25,544	31,973	26,546
Total noninterest income	185,408	183,747	170,032
NONINTEREST EXPENSE
Salaries and employee benefits	199,986	184,976	166,723
Occupancy, net	21,027	19,326	18,483
Depreciation	18,657	18,600	16,925
Amortization of intangible assets	3,532	3,448	3,116
Data processing services	8,368	7,584	6,735
Net expense from other real estate owned	15,938	9,911	9,089
Marketing and business promotion	9,114	8,074	7,403
Deposit insurance	5,827	4,735	3,456
Other	50,009	53,258	54,051
Total noninterest expense	332,458	309,912	285,981
Income before taxes	269,948	237,432	208,398
Income tax expense	57,483	44,332	40,768
Net income	$ 212,465	$ 193,100	$ 167,630
NET INCOME PER COMMON SHARE
Basic	$ 6.45	$ 5.89	$ 5.12
Diluted	$ 6.34	$ 5.77	$ 5.03
OTHER COMPREHENSIVE (LOSS)/GAIN
Unrealized gains/(losses) on available for sale debt securities, net of tax (expense)/benefit of $(6,634), $23,160 and $1,829, respectively	$ 21,521	$ (74,880)	$ (5,280)
Reclassification adjustment for available for sale debt security gains included in net income, net of tax expense of $0, $(369) and $0, respectively		1,167
Other comprehensive gain/(loss), net of tax (expense)/benefit of $(6,634), $22,791 and $1,829, respectively	21,521	(73,713)	(5,280)
Comprehensive income	233,986	119,387	162,350
Trust Revenue [Member]
NONINTEREST INCOME
Revenue	18,784	15,645	12,912
Service Charges on Deposits [Member]
NONINTEREST INCOME
Revenue	$ 77,367	$ 86,757	$ 83,425