Allowance for Credit Losses - Changes in the Allowance for Credit Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Allowance for credit losses on loans:
Beginning balance	$ 192,090	$ 164,171
Charge-offs	(19,040)	(14,185)
Recoveries	6,710	6,856
Net charge-offs	(12,330)	(7,329)
Provision (recoveries) of credit losses on loans	18,793	23,788	$ (1,700)
Ending balance	198,578	192,090	164,171
Individually evaluated	10,578	6,442
Collectively evaluated	188,000	185,648
Loans:
Individually evaluated	45,601	29,450
Collectively evaluated	12,305,629	11,548,854
Loans, net of unearned income	12,351,230	11,578,304
Nonaccruing loans with no allowance for credit losses	$ 23,592	10,899
Supportable period	2 years
Commercial
Allowance for credit losses on loans:
Beginning balance	$ 44,255	33,922
Charge-offs	(8,838)	(5,120)
Recoveries	3,090	2,471
Net charge-offs	(5,748)	(2,649)
Provision (recoveries) of credit losses on loans	5,448	1,522
Ending balance	43,980	44,255	33,922
Individually evaluated	9,093	4,397
Collectively evaluated	34,887	39,858
Loans:
Individually evaluated	18,026	8,536
Collectively evaluated	1,853,795	1,665,347
Loans, net of unearned income	1,871,821	1,673,883
Nonaccruing loans with no allowance for credit losses	1,689	464
Real Estate  - Construction
Allowance for credit losses on loans:
Beginning balance	19,114	16,419
Charge-offs	(57)	0
Recoveries	48	0
Net charge-offs	(9)	0
Provision (recoveries) of credit losses on loans	(493)	2,695
Ending balance	18,612	19,114	16,419
Individually evaluated	0	0
Collectively evaluated	18,612	19,114
Loans:
Individually evaluated	0	489
Collectively evaluated	1,333,397	1,329,848
Loans, net of unearned income	1,333,397	1,330,337
Nonaccruing loans with no allowance for credit losses	0	0
Real Estate - 1-4 Family Mortgage
Allowance for credit losses on loans:
Beginning balance	44,727	32,356
Charge-offs	(417)	(757)
Recoveries	389	821
Net charge-offs	(28)	64
Provision (recoveries) of credit losses on loans	2,584	12,307
Ending balance	47,283	44,727	32,356
Individually evaluated	83	46
Collectively evaluated	47,200	44,681
Loans:
Individually evaluated	11,600	9,202
Collectively evaluated	3,428,319	3,207,061
Loans, net of unearned income	3,439,919	3,216,263
Nonaccruing loans with no allowance for credit losses	10,876	7,278
Real Estate  - Commercial Mortgage
Allowance for credit losses on loans:
Beginning balance	71,798	68,940
Charge-offs	(5,568)	(5,134)
Recoveries	712	418
Net charge-offs	(4,856)	(4,716)
Provision (recoveries) of credit losses on loans	10,078	7,574
Ending balance	77,020	71,798	68,940
Individually evaluated	1,132	1,729
Collectively evaluated	75,888	70,069
Loans:
Individually evaluated	15,705	10,953
Collectively evaluated	5,470,845	5,107,110
Loans, net of unearned income	5,486,550	5,118,063
Nonaccruing loans with no allowance for credit losses	11,027	3,157
Lease Financing Receivables
Allowance for credit losses on loans:
Beginning balance	2,463	1,486
Charge-offs	(1,524)	(7)
Recoveries	18	146
Net charge-offs	(1,506)	139
Provision (recoveries) of credit losses on loans	1,558	838
Ending balance	2,515	2,463	1,486
Individually evaluated	0	0
Collectively evaluated	2,515	2,463
Loans:
Individually evaluated	0	0
Collectively evaluated	116,020	115,013
Loans, net of unearned income	116,020	115,013
Nonaccruing loans with no allowance for credit losses	0	0
Installment loans to individuals
Allowance for credit losses on loans:
Beginning balance	9,733	11,048
Charge-offs	(2,636)	(3,167)
Recoveries	2,453	3,000
Net charge-offs	(183)	(167)
Provision (recoveries) of credit losses on loans	(382)	(1,148)
Ending balance	9,168	9,733	11,048
Individually evaluated	270	270
Collectively evaluated	8,898	9,463
Loans:
Individually evaluated	270	270
Collectively evaluated	103,253	124,475
Loans, net of unearned income	103,523	124,745
Nonaccruing loans with no allowance for credit losses	0	0
Impact of PCD loans acquired during the period
Allowance for credit losses on loans:
Beginning balance	25	11,460
Ending balance		25	11,460
Impact of PCD loans acquired during the period | Commercial
Allowance for credit losses on loans:
Beginning balance	25	11,460
Ending balance		25	11,460
Impact of PCD loans acquired during the period | Real Estate  - Construction
Allowance for credit losses on loans:
Beginning balance	0	0
Ending balance		0	0
Impact of PCD loans acquired during the period | Real Estate - 1-4 Family Mortgage
Allowance for credit losses on loans:
Beginning balance	0	0
Ending balance		0	0
Impact of PCD loans acquired during the period | Real Estate  - Commercial Mortgage
Allowance for credit losses on loans:
Beginning balance	0	0
Ending balance		0	0
Impact of PCD loans acquired during the period | Lease Financing Receivables
Allowance for credit losses on loans:
Beginning balance	0	0
Ending balance		0	0
Impact of PCD loans acquired during the period | Installment loans to individuals
Allowance for credit losses on loans:
Beginning balance	$ 0	0
Ending balance		$ 0	$ 0