Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
INTEREST INCOME
Loans, including fees	$ 336,340	$ 316,124	$ 311,987
Debt securities:
Taxable	24,456	6,327	8,591
Tax-exempt	93	204	487
Federal funds sold	83
Interest-bearing deposits with banks	58,848	4,366	6,049
Total interest income	419,820	327,021	327,114
INTEREST EXPENSE
Deposits	41,965	8,232	18,472
Short-term borrowings	60	2	8
Subordinated debt	4,122	3,130	1,966
Total interest expense	46,147	11,364	20,446
Net interest income	373,673	315,657	306,668
Provision for (benefit from) credit losses	10,076	(8,690)	62,648
Net interest income after provision for (benefit from) credit losses	363,597	324,347	244,020
NONINTEREST INCOME
Securities transactions (includes accumulated other comprehensive income reclassifications of $1,536, $0 and $0, respectively)	(1,833)	1,047	(389)
Income from sales of loans	4,548	7,282	6,067
Insurance commissions	26,883	23,745	20,996
Cash management	19,326	12,313	15,411
Gain on sale of other assets	448	2,762	130
Other	31,973	26,546	7,439
Total noninterest income	183,747	170,032	137,222
NONINTEREST EXPENSE
Salaries and employee benefits	184,976	166,723	164,727
Occupancy, net	19,326	18,483	16,421
Depreciation	18,600	16,925	14,609
Amortization of intangible assets	3,448	3,116	3,815
Data processing services	7,584	6,735	6,753
Net expense/(income) from other real estate owned	9,911	9,089	(1,531)
Marketing and business promotion	8,074	7,403	6,996
Deposit insurance	4,735	3,456	2,081
Other	53,258	54,051	43,859
Total noninterest expense	309,912	285,981	257,730
Income before taxes	237,432	208,398	123,512
Income tax expense	44,332	40,768	23,926
Net income	$ 193,100	$ 167,630	$ 99,586
NET INCOME PER COMMON SHARE
Basic	$ 5.89	$ 5.12	$ 3.05
Diluted	$ 5.77	$ 5.03	$ 3.00
OTHER COMPREHENSIVE (LOSS)/GAIN
Unrealized (losses)/gains on securities, net of tax benefit/(expense) of $23,160, $1,829 and $(1,326), respectively	$ (74,880)	$ (5,280)	$ 3,976
Reclassification adjustment for gains included in net income, net of tax expense of $(369), $0 and $0, respectively	1,167
Other comprehensive (loss)/gain, net of tax benefit/(expense) of $22,791, $1,829 and $(1,326), respectively	(73,713)	(5,280)	3,976
Comprehensive income	119,387	162,350	103,562
Trust Revenue [Member]
NONINTEREST INCOME
Revenue	15,645	12,912	13,130
Service Charges on Deposits [Member]
NONINTEREST INCOME
Revenue	$ 86,757	$ 83,425	$ 74,438