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Loans and Allowance for Credit Losses Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Total
Total	$ 24,012,539		$ 24,012,539		$ 24,044,919
Current period gross charge-offs	(15,916)	$ (14,007)	(35,950)	$ (24,959)
Real estate - commercial mortgage
Total
Total	9,678,038		9,678,038		9,601,858
Gross loans	9,678,038		9,678,038		9,601,858
Commercial and Industrial
Total
Total	4,541,765		4,541,765		4,605,589
Gross loans	4,541,765		4,541,765		4,605,589
Leases and other loans
Total
Total	348,591		348,591		315,458
Gross loans	348,591		348,591		315,458
Real estate - residential mortgage
Total
Total	6,511,687		6,511,687		6,349,643
Gross loans	6,511,687		6,511,687		6,349,643
Portfolio Segment and Loan Class
2025
Total	711,827		711,827		1,286,860
2024
Total	1,423,048		1,423,048		2,032,639
2023
Total	2,089,781		2,089,781		2,210,556
2022
Total	2,080,498		2,080,498		1,976,780
2021
Total	1,855,377		1,855,377		1,476,712
Prior
Total	5,607,120		5,607,120		4,569,991
Revolving Loans Amortized Cost Basis
Total	1,690,145		1,690,145		1,782,925
Total
Total	15,488,018		15,488,018		15,383,443
Portfolio Segment and Loan Class \| Pass
2025
Total	709,418		709,418		1,256,865
2024
Total	1,382,300		1,382,300		1,879,088
2023
Total	1,892,515		1,892,515		1,808,587
2022
Total	1,777,679		1,777,679		1,615,041
2021
Total	1,535,456		1,535,456		1,354,603
Prior
Total	5,074,035		5,074,035		4,140,549
Revolving Loans Amortized Cost Basis
Total	1,418,839		1,418,839		1,475,751
Total
Total	13,800,817		13,800,817		13,547,095
Portfolio Segment and Loan Class \| Special Mention
2025
Total	1,446		1,446		14,369
2024
Total	21,091		21,091		92,293
2023
Total	105,462		105,462		249,862
2022
Total	112,487		112,487		245,540
2021
Total	210,962		210,962		34,516
Prior
Total	168,330		168,330		165,731
Revolving Loans Amortized Cost Basis
Total	111,268		111,268		128,918
Total
Total	741,439		741,439		931,542
Portfolio Segment and Loan Class \| Substandard or Lower
2025
Total	963		963		15,626
2024
Total	19,657		19,657		61,258
2023
Total	91,804		91,804		152,107
2022
Total	190,332		190,332		116,199
2021
Total	108,959		108,959		87,593
Prior
Total	364,755		364,755		263,711
Revolving Loans Amortized Cost Basis
Total	160,038		160,038		178,256
Total
Total	945,762		945,762		904,806
Portfolio Segment and Loan Class \| Real estate - commercial mortgage
2025
Total	293,023		293,023		633,014
Current period gross charge-offs			0		0
2024
Total	669,228		669,228		1,016,309
Current period gross charge-offs			0		(126)
2023
Total	1,204,635		1,204,635		1,390,901
Current period gross charge-offs			0		(84)
2022
Total	1,372,705		1,372,705		1,569,160
Current period gross charge-offs			(11,149)		0
2021
Total	1,529,188		1,529,188		1,181,456
Current period gross charge-offs			(4,052)		0
Prior
Total	4,534,992		4,534,992		3,715,159
Current period gross charge-offs			(3,307)		(12,950)
Revolving Loans Amortized Cost Basis
Total	73,667		73,667		82,300
Current period gross charge-offs			0		0
Total
Total	9,678,038		9,678,038		9,601,858
Current period gross charge-offs			(18,508)		(13,186)
Portfolio Segment and Loan Class \| Real estate - commercial mortgage \| Pass
2025
Total	292,672		292,672		623,742
2024
Total	653,936		653,936		898,296
2023
Total	1,058,157		1,058,157		1,138,669
2022
Total	1,173,880		1,173,880		1,316,000
2021
Total	1,258,685		1,258,685		1,077,625
Prior
Total	4,131,150		4,131,150		3,414,138
Revolving Loans Amortized Cost Basis
Total	71,916		71,916		69,942
Total
Total	8,640,996		8,640,996		8,548,058
Portfolio Segment and Loan Class \| Real estate - commercial mortgage \| Special Mention
2025
Total	0		0		4,441
2024
Total	2,320		2,320		73,348
2023
Total	79,027		79,027		149,280
2022
Total	85,562		85,562		157,543
2021
Total	176,162		176,162		28,734
Prior
Total	144,806		144,806		107,099
Revolving Loans Amortized Cost Basis
Total	555		555		10,978
Total
Total	488,432		488,432		531,423
Portfolio Segment and Loan Class \| Real estate - commercial mortgage \| Substandard or Lower
2025
Total	351		351		4,831
2024
Total	12,972		12,972		44,665
2023
Total	67,451		67,451		102,952
2022
Total	113,263		113,263		95,617
2021
Total	94,341		94,341		75,097
Prior
Total	259,036		259,036		193,922
Revolving Loans Amortized Cost Basis
Total	1,196		1,196		1,380
Total
Total	548,610		548,610		522,377
Portfolio Segment and Loan Class \| Commercial and Industrial
2025
Total	252,625		252,625		456,640
Current period gross charge-offs			0		(612)
2024
Total	414,753		414,753		511,646
Current period gross charge-offs			(525)		(3,709)
2023
Total	490,331		490,331		567,301
Current period gross charge-offs			(4,417)		(2,560)
2022
Total	517,184		517,184		290,674
Current period gross charge-offs			(2,548)		(4,587)
2021
Total	251,717		251,717		285,534
Current period gross charge-offs			(578)		(317)
Prior
Total	1,003,121		1,003,121		793,002
Current period gross charge-offs			(1,351)		(7,612)
Revolving Loans Amortized Cost Basis
Total	1,582,412		1,582,412		1,669,896
Current period gross charge-offs			(226)		(3,553)
Total
Total	4,541,765		4,541,765		4,605,589
Current period gross charge-offs			(9,645)		(26,585)
Portfolio Segment and Loan Class \| Commercial and Industrial \| Pass
2025
Total	251,132		251,132		435,917
2024
Total	393,178		393,178		486,720
2023
Total	447,226		447,226		512,622
2022
Total	475,498		475,498		261,603
2021
Total	228,029		228,029		268,194
Prior
Total	889,983		889,983		684,931
Revolving Loans Amortized Cost Basis
Total	1,312,944		1,312,944		1,375,201
Total
Total	4,007,965		4,007,965		4,031,534
Portfolio Segment and Loan Class \| Commercial and Industrial \| Special Mention
2025
Total	1,081		1,081		9,928
2024
Total	17,172		17,172		8,333
2023
Total	22,739		22,739		19,931
2022
Total	11,334		11,334		18,888
2021
Total	12,507		12,507		4,844
Prior
Total	22,040		22,040		58,632
Revolving Loans Amortized Cost Basis
Total	110,713		110,713		117,940
Total
Total	207,979		207,979		238,809
Portfolio Segment and Loan Class \| Commercial and Industrial \| Substandard or Lower
2025
Total	412		412		10,795
2024
Total	4,403		4,403		16,593
2023
Total	20,366		20,366		34,748
2022
Total	30,352		30,352		10,183
2021
Total	11,181		11,181		12,496
Prior
Total	91,098		91,098		49,439
Revolving Loans Amortized Cost Basis
Total	158,755		158,755		176,755
Total
Total	325,821		325,821		335,246
Portfolio Segment and Loan Class \| Real estate - construction(1)
2025
Total	28,284		28,284		197,206
Current period gross charge-offs			0		0
2024
Total	276,486		276,486		504,684
Current period gross charge-offs			0		0
2023
Total	314,444		314,444		252,354
Current period gross charge-offs			0			$ 0
2022
Total	150,426		150,426		116,946
Current period gross charge-offs			0		0
2021
Total	61,223		61,223		9,722
Current period gross charge-offs			0		0
Prior
Total	54,695		54,695		61,830
Current period gross charge-offs			(100)		0
Revolving Loans Amortized Cost Basis
Total	34,066		34,066		30,729
Current period gross charge-offs			0		0
Total
Total	919,624		919,624		1,175,996
Current period gross charge-offs			(100)		0
Portfolio Segment and Loan Class \| Real estate - construction(1) \| Pass
2025
Total	28,284		28,284		197,206
2024
Total	276,486		276,486		494,072
2023
Total	308,355		308,355		157,296
2022
Total	91,472		91,472		37,438
2021
Total	36,324		36,324		8,784
Prior
Total	39,947		39,947		41,480
Revolving Loans Amortized Cost Basis
Total	33,979		33,979		30,608
Total
Total	814,847		814,847		967,503
Portfolio Segment and Loan Class \| Real estate - construction(1) \| Special Mention
2025
Total	0		0		0
2024
Total	0		0		10,612
2023
Total	3,195		3,195		80,651
2022
Total	15,093		15,093		69,109
2021
Total	21,990		21,990		938
Prior
Total	236		236		0
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	40,514		40,514		161,310
Portfolio Segment and Loan Class \| Real estate - construction(1) \| Substandard or Lower
2025
Total	0		0		0
2024
Total	0		0		0
2023
Total	2,894		2,894		14,407
2022
Total	43,861		43,861		10,399
2021
Total	2,909		2,909		0
Prior
Total	14,512		14,512		20,350
Revolving Loans Amortized Cost Basis
Total	87		87		121
Total
Total	64,263		64,263		47,183
Payment Activity, Aging Status
2025
Total	567,640		567,640		912,394
2024
Total	688,794		688,794		998,060
2023
Total	827,368		827,368		1,804,966
2022
Total	1,661,290		1,661,290		1,815,735
2021
Total	1,727,012		1,727,012		1,087,446
Prior
Total	2,044,217		2,044,217		1,082,486
Revolving Loans Amortized Cost Basis
Total	986,922		986,922		916,813
Total
Total	8,524,521		8,524,521		8,661,476
Payment Activity, Aging Status \| Performing
2025
Total	567,419		567,419		912,071
2024
Total	688,627		688,627		995,854
2023
Total	825,054		825,054		1,795,602
2022
Total	1,654,050		1,654,050		1,810,796
2021
Total	1,722,585		1,722,585		1,081,147
Prior
Total	2,011,721		2,011,721		1,038,004
Revolving Loans Amortized Cost Basis
Total	984,036		984,036		913,920
Total
Total	8,474,303		8,474,303		8,587,778
Payment Activity, Aging Status \| Nonperforming
2025
Total	221		221		323
2024
Total	167		167		2,206
2023
Total	2,314		2,314		9,364
2022
Total	7,240		7,240		4,939
2021
Total	4,427		4,427		6,299
Prior
Total	32,496		32,496		44,482
Revolving Loans Amortized Cost Basis
Total	2,886		2,886		2,893
Total
Total	50,218		50,218		73,698
Payment Activity, Aging Status \| Leases and other loans
2025
Total	137,895		137,895		123,991
Current period gross charge-offs			(1,009)		(1,977)
2024
Total	62,581		62,581		89,006
Current period gross charge-offs			(787)		(913)
2023
Total	80,371		80,371		54,646
Current period gross charge-offs			(304)		(335)
2022
Total					17,638
Current period gross charge-offs			(164)		(334)
2021
Total					10,853
Current period gross charge-offs			(107)		(192)
Prior
Total					19,324
Current period gross charge-offs			(647)		(770)
Revolving Loans Amortized Cost Basis
Total	0		0		0
Current period gross charge-offs			0		0
Total
Total	348,591		348,591		315,458
Current period gross charge-offs			(3,018)		(4,696)
Payment Activity, Aging Status \| Leases and other loans \| Pass
2025
Total	137,330		137,330
2024
Total	58,700		58,700
2023
Total	78,777		78,777
2022
Total	36,829		36,829
2021
Total	12,418		12,418
Prior
Total	12,955		12,955
Revolving Loans Amortized Cost Basis
Total	0		0
Total
Total	337,009		337,009
Payment Activity, Aging Status \| Leases and other loans \| Special Mention
2025
Total	365		365
2024
Total	1,599		1,599
2023
Total	501		501
2022
Total	498		498
2021
Total	303		303
Prior
Total	1,248		1,248
Revolving Loans Amortized Cost Basis
Total	0		0
Total
Total	4,514		4,514
Payment Activity, Aging Status \| Leases and other loans \| Substandard or Lower
2025
Total	200		200
2024
Total	2,282		2,282
2023
Total	1,093		1,093
2022
Total	2,856		2,856
2021
Total	528		528
Prior
Total	109		109
Revolving Loans Amortized Cost Basis
Total	0		0
Total
Total	7,068		7,068
Payment Activity, Aging Status \| Leases and other loans \| Performing
2025
Total					123,991
2024
Total					89,006
2023
Total					52,724
2022
Total					16,894
2021
Total					10,830
Prior
Total					9,996
Revolving Loans Amortized Cost Basis
Total					0
Total
Total					303,441
Payment Activity, Aging Status \| Leases and other loans \| Nonperforming
2025
Total					0
2024
Total					0
2023
Total					1,922
2022
Total	40,183		40,183		744
2021
Total	13,249		13,249		23
Prior
Total	14,312		14,312		9,328
Revolving Loans Amortized Cost Basis
Total					0
Total
Total					12,017
Payment Activity, Aging Status \| Real estate - residential mortgage
2025
Total	326,209		326,209		471,005
Current period gross charge-offs			0		0
2024
Total	508,562		508,562		729,988
Current period gross charge-offs			(19)		(172)
2023
Total	717,348		717,348		1,520,639
Current period gross charge-offs			(59)		(106)
2022
Total	1,478,906		1,478,906		1,730,223
Current period gross charge-offs			(130)		(12)
2021
Total	1,673,428		1,673,428		1,027,639
Current period gross charge-offs			(150)		(43)
Prior
Total	1,807,234		1,807,234		870,149
Current period gross charge-offs			(243)		(888)
Revolving Loans Amortized Cost Basis
Total	0		0		0
Current period gross charge-offs			0		0
Total
Total	6,511,687		6,511,687		6,349,643
Current period gross charge-offs			(601)		(1,472)
Payment Activity, Aging Status \| Real estate - residential mortgage \| Performing
2025
Total	326,209		326,209		470,918
2024
Total	508,495		508,495		728,630
2023
Total	715,245		715,245		1,515,521
2022
Total	1,473,677		1,473,677		1,726,991
2021
Total	1,669,747		1,669,747		1,022,116
Prior
Total	1,780,611		1,780,611		839,566
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	6,473,984		6,473,984		6,303,742
Payment Activity, Aging Status \| Real estate - residential mortgage \| Nonperforming
2025
Total	0		0		87
2024
Total	67		67		1,358
2023
Total	2,103		2,103		5,118
2022
Total	5,229		5,229		3,232
2021
Total	3,681		3,681		5,523
Prior
Total	26,623		26,623		30,583
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	37,703		37,703		45,901
Payment Activity, Aging Status \| Consumer and Real Estate - Home Equity
2025
Total	180,081		180,081		178,958
Current period gross charge-offs			(6)		(118)
2024
Total	31,076		31,076		117,218
Current period gross charge-offs			(140)		(1,016)
2023
Total	93,176		93,176		212,565
Current period gross charge-offs			(545)		(1,552)
2022
Total	174,259		174,259		66,375
Current period gross charge-offs			(820)		(790)
2021
Total	53,584		53,584		48,954
Current period gross charge-offs			(304)		(398)
Prior
Total	236,983		236,983		193,013
Current period gross charge-offs			(2,002)		(2,704)
Revolving Loans Amortized Cost Basis
Total	986,922		986,922		916,813
Current period gross charge-offs			(261)		(75)
Total
Total	1,777,359		1,777,359		1,777,472
Current period gross charge-offs			(4,078)		(8,490)
Payment Activity, Aging Status \| Consumer and Real Estate - Home Equity \| Performing
2025
Total	179,860		179,860		178,722
2024
Total	30,976		30,976		116,370
2023
Total	92,965		92,965		211,647
2022
Total	173,654		173,654		65,412
2021
Total	52,838		52,838		48,201
Prior
Total	231,110		231,110		188,442
Revolving Loans Amortized Cost Basis
Total	984,036		984,036		913,920
Total
Total	1,766,250		1,766,250		1,763,098
Payment Activity, Aging Status \| Consumer and Real Estate - Home Equity \| Nonperforming
2025
Total	221		221		236
2024
Total	100		100		848
2023
Total	211		211		918
2022
Total	605		605		963
2021
Total	746		746		753
Prior
Total	5,873		5,873		4,571
Revolving Loans Amortized Cost Basis
Total	2,886		2,886		2,893
Total
Total	11,109		11,109		14,374
Payment Activity, Aging Status \| Construction - other
2025
Total	61,350		61,350		138,440
Current period gross charge-offs			0		0
2024
Total	149,156		149,156		61,848
Current period gross charge-offs			0		0
2023
Total	16,844		16,844		17,116
Current period gross charge-offs			0		0
2022
Total	8,125		8,125		1,499
Current period gross charge-offs			0		0
2021
Total	0		0		0
Current period gross charge-offs			0		0
Prior
Total	0		0		0
Current period gross charge-offs			0		0
Revolving Loans Amortized Cost Basis
Total	0		0		0
Current period gross charge-offs			0		0
Total
Total	235,475		235,475		218,903
Current period gross charge-offs			0		0
Payment Activity, Aging Status \| Construction - other \| Performing
2025
Total					138,440
2024
Total	149,156		149,156		61,848
2023
Total	16,844		16,844		15,710
2022
Total	6,719		6,719		1,499
2021
Total	0		0		0
Prior
Total	0		0		0
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	234,069		234,069		217,497
Payment Activity, Aging Status \| Construction - other \| Nonperforming
2025
Total	0		0		0
2024
Total	0		0		0
2023
Total	0		0		1,406
2022
Total	1,406		1,406		0
2021
Total	0		0		0
Prior
Total	0		0		0
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	1,406		1,406		1,406
Conversion to Term Loan \| Portfolio Segment and Loan Class
Revolving Loans Amortized Cost Basis
Total	30,222		30,222		46,980
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Pass
Revolving Loans Amortized Cost Basis
Total	10,575		10,575		16,611
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Special Mention
Revolving Loans Amortized Cost Basis
Total	10,393		10,393		313
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	9,254		9,254		30,056
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - commercial mortgage
Revolving Loans Amortized Cost Basis
Total	600		600		13,559
Current period gross charge-offs			0		(26)
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - commercial mortgage \| Pass
Revolving Loans Amortized Cost Basis
Total	600		600		9,646
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - commercial mortgage \| Special Mention
Revolving Loans Amortized Cost Basis
Total	0		0		0
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - commercial mortgage \| Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	0		0		3,913
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Commercial and Industrial
Revolving Loans Amortized Cost Basis
Total	29,622		29,622		30,896
Current period gross charge-offs			0		(3,635)
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Commercial and Industrial \| Pass
Revolving Loans Amortized Cost Basis
Total	9,975		9,975		6,346
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Commercial and Industrial \| Special Mention
Revolving Loans Amortized Cost Basis
Total	10,393		10,393		313
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Commercial and Industrial \| Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	9,254		9,254		24,237
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - construction(1)
Revolving Loans Amortized Cost Basis
Total	0		0		2,525
Current period gross charge-offs			0		0
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - construction(1) \| Pass
Revolving Loans Amortized Cost Basis
Total	0		0		619
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - construction(1) \| Special Mention
Revolving Loans Amortized Cost Basis
Total	0		0		0
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - construction(1) \| Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	0		0		1,906
Conversion to Term Loan \| Payment Activity, Aging Status
Revolving Loans Amortized Cost Basis
Total	21,278		21,278		43,576
Conversion to Term Loan \| Payment Activity, Aging Status \| Performing
Revolving Loans Amortized Cost Basis
Total	20,811		20,811		40,384
Conversion to Term Loan \| Payment Activity, Aging Status \| Nonperforming
Revolving Loans Amortized Cost Basis
Total	467		467		3,192
Conversion to Term Loan \| Payment Activity, Aging Status \| Leases and other loans
Revolving Loans Amortized Cost Basis
Total	0		0		0
Current period gross charge-offs			0		(175)
Conversion to Term Loan \| Payment Activity, Aging Status \| Leases and other loans \| Pass
Revolving Loans Amortized Cost Basis
Total	0		0
Conversion to Term Loan \| Payment Activity, Aging Status \| Leases and other loans \| Special Mention
Revolving Loans Amortized Cost Basis
Total	0		0
Conversion to Term Loan \| Payment Activity, Aging Status \| Leases and other loans \| Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	0		0
Conversion to Term Loan \| Payment Activity, Aging Status \| Leases and other loans \| Performing
Revolving Loans Amortized Cost Basis
Total					0
Conversion to Term Loan \| Payment Activity, Aging Status \| Leases and other loans \| Nonperforming
Revolving Loans Amortized Cost Basis
Total					0
Conversion to Term Loan \| Payment Activity, Aging Status \| Real estate - residential mortgage
Revolving Loans Amortized Cost Basis
Total	0		0		0
Current period gross charge-offs			0		(251)
Conversion to Term Loan \| Payment Activity, Aging Status \| Real estate - residential mortgage \| Performing
Revolving Loans Amortized Cost Basis
Total	0		0		0
Conversion to Term Loan \| Payment Activity, Aging Status \| Real estate - residential mortgage \| Nonperforming
Revolving Loans Amortized Cost Basis
Total	0		0		0
Conversion to Term Loan \| Payment Activity, Aging Status \| Consumer and Real Estate - Home Equity
Revolving Loans Amortized Cost Basis
Total	21,278		21,278		43,576
Current period gross charge-offs			0		(1,837)
Conversion to Term Loan \| Payment Activity, Aging Status \| Consumer and Real Estate - Home Equity \| Performing
Revolving Loans Amortized Cost Basis
Total	20,811		20,811		40,384
Conversion to Term Loan \| Payment Activity, Aging Status \| Consumer and Real Estate - Home Equity \| Nonperforming
Revolving Loans Amortized Cost Basis
Total	467		467		3,192
Conversion to Term Loan \| Payment Activity, Aging Status \| Construction - other
Revolving Loans Amortized Cost Basis
Total	0		0		0
Current period gross charge-offs			0		0
Conversion to Term Loan \| Payment Activity, Aging Status \| Construction - other \| Performing
Revolving Loans Amortized Cost Basis
Total	0		0		0
Conversion to Term Loan \| Payment Activity, Aging Status \| Construction - other \| Nonperforming
Revolving Loans Amortized Cost Basis
Total	$ 0		$ 0		$ 0