Allowance for Credit Losses - Changes in the Allowance for Credit Loss (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Allowance for credit losses on loans:
Beginning balance	$ 198,578,000	$ 192,090,000
Charge-offs	(13,809,000)	(19,040,000)
Recoveries	5,739,000	6,710,000
Net charge-offs	(8,070,000)	(12,330,000)
(Recoveries of) provision for credit losses on loans	11,248,000	18,793,000	$ 23,788,000
Ending balance	201,756,000	198,578,000	192,090,000
Individually evaluated	15,052,000	10,578,000
Collectively evaluated	186,704,000	188,000,000
Loans:
Individually evaluated	66,063,000	45,601,000
Collectively evaluated	12,818,957,000	12,305,629,000
Loans, net of unearned income	12,885,020,000	12,351,230,000
Nonaccruing loans with no allowance for credit losses	$ 22,039,000	23,592,000
Supportable period	2 years
Commercial
Allowance for credit losses on loans:
Beginning balance	$ 43,980,000	44,255,000
Charge-offs	(4,463,000)	(8,838,000)
Recoveries	1,710,000	3,090,000
Net charge-offs	(2,753,000)	(5,748,000)
(Recoveries of) provision for credit losses on loans	(2,700,000)	5,448,000
Ending balance	38,527,000	43,980,000	44,255,000
Individually evaluated	3,823,000	9,093,000
Collectively evaluated	34,704,000	34,887,000
Loans:
Individually evaluated	9,712,000	18,026,000
Collectively evaluated	1,876,105,000	1,853,795,000
Loans, net of unearned income	1,885,817,000	1,871,821,000
Nonaccruing loans with no allowance for credit losses	122,000	1,689,000
Real Estate  - Construction
Allowance for credit losses on loans:
Beginning balance	18,612,000	19,114,000
Charge-offs	(145,000)	(57,000)
Recoveries	0	48,000
Net charge-offs	(145,000)	(9,000)
(Recoveries of) provision for credit losses on loans	(3,341,000)	(493,000)
Ending balance	15,126,000	18,612,000	19,114,000
Individually evaluated	0	0
Collectively evaluated	15,126,000	18,612,000
Loans:
Individually evaluated	241,000	0
Collectively evaluated	1,093,412,000	1,333,397,000
Loans, net of unearned income	1,093,653,000	1,333,397,000
Nonaccruing loans with no allowance for credit losses	241,000	0
Real Estate - 1-4 Family Mortgage
Allowance for credit losses on loans:
Beginning balance	47,283,000	44,727,000
Charge-offs	(966,000)	(417,000)
Recoveries	166,000	389,000
Net charge-offs	(800,000)	(28,000)
(Recoveries of) provision for credit losses on loans	1,278,000	2,584,000
Ending balance	47,761,000	47,283,000	44,727,000
Individually evaluated	0	83,000
Collectively evaluated	47,761,000	47,200,000
Loans:
Individually evaluated	6,576,000	11,600,000
Collectively evaluated	3,482,301,000	3,428,319,000
Loans, net of unearned income	3,488,877,000	3,439,919,000
Nonaccruing loans with no allowance for credit losses	6,298,000	10,876,000
Real Estate  - Commercial Mortgage
Allowance for credit losses on loans:
Beginning balance	77,020,000	71,798,000
Charge-offs	(5,737,000)	(5,568,000)
Recoveries	2,278,000	712,000
Net charge-offs	(3,459,000)	(4,856,000)
(Recoveries of) provision for credit losses on loans	16,643,000	10,078,000
Ending balance	90,204,000	77,020,000	71,798,000
Individually evaluated	9,622,000	1,132,000
Collectively evaluated	80,582,000	75,888,000
Loans:
Individually evaluated	45,182,000	15,705,000
Collectively evaluated	6,190,886,000	5,470,845,000
Loans, net of unearned income	6,236,068,000	5,486,550,000
Nonaccruing loans with no allowance for credit losses	14,764,000	11,027,000
Lease Financing Receivables
Allowance for credit losses on loans:
Beginning balance	2,515,000	2,463,000
Charge-offs	(642,000)	(1,524,000)
Recoveries	34,000	18,000
Net charge-offs	(608,000)	(1,506,000)
(Recoveries of) provision for credit losses on loans	1,461,000	1,558,000
Ending balance	3,368,000	2,515,000	2,463,000
Individually evaluated	1,337,000	0
Collectively evaluated	2,031,000	2,515,000
Loans:
Individually evaluated	4,082,000	0
Collectively evaluated	86,509,000	116,020,000
Loans, net of unearned income	90,591,000	116,020,000
Nonaccruing loans with no allowance for credit losses	614,000	0
Installment loans to individuals
Allowance for credit losses on loans:
Beginning balance	9,168,000	9,733,000
Charge-offs	(1,856,000)	(2,636,000)
Recoveries	1,551,000	2,453,000
Net charge-offs	(305,000)	(183,000)
(Recoveries of) provision for credit losses on loans	(2,093,000)	(382,000)
Ending balance	6,770,000	9,168,000	9,733,000
Individually evaluated	270,000	270,000
Collectively evaluated	6,500,000	8,898,000
Loans:
Individually evaluated	270,000	270,000
Collectively evaluated	89,744,000	103,253,000
Loans, net of unearned income	90,014,000	103,523,000
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	0	25,000
Ending balance		0	25,000
Impact of PCD loans acquired during the period | Commercial
Allowance for credit losses on loans:
Beginning balance	0	25,000
Ending balance	34,000	0	25,000
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