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Loans and Allowance for Credit Losses Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Total
Total	$ 24,041,489		$ 24,041,489		$ 24,044,919
Current period gross charge-offs	(19,439)	$ (13,144)	(55,388)	$ (38,103)
Real estate - commercial mortgage
Total
Total	9,734,156		9,734,156		9,601,858
Gross loans	9,734,156		9,734,156		9,601,858
Commercial and Industrial
Total
Total	4,437,905		4,437,905		4,605,589
Gross loans	4,437,905		4,437,905		4,605,589
Leases and other loans
Total
Total	336,973		336,973		315,458
Gross loans	336,973		336,973		315,458
Real estate - residential mortgage
Total
Total	6,617,017		6,617,017		6,349,643
Gross loans	6,617,017		6,617,017		6,349,643
Portfolio Segment and Loan Class
2025
Total	1,124,804		1,124,804		1,286,860
2024
Total	1,439,997		1,439,997		2,032,639
2023
Total	2,015,978		2,015,978		2,210,556
2022
Total	2,030,724		2,030,724		1,976,780
2021
Total	1,719,509		1,719,509		1,476,712
Prior
Total	5,368,940		5,368,940		4,569,991
Revolving Loans Amortized Cost Basis
Total	1,675,444		1,675,444		1,782,925
Total
Total	15,396,647		15,396,647		15,383,443
Portfolio Segment and Loan Class \| Pass
2025
Total	1,117,852		1,117,852		1,256,865
2024
Total	1,388,739		1,388,739		1,879,088
2023
Total	1,778,403		1,778,403		1,808,587
2022
Total	1,719,615		1,719,615		1,615,041
2021
Total	1,458,678		1,458,678		1,354,603
Prior
Total	4,824,015		4,824,015		4,140,549
Revolving Loans Amortized Cost Basis
Total	1,467,133		1,467,133		1,475,751
Total
Total	13,758,338		13,758,338		13,547,095
Portfolio Segment and Loan Class \| Special Mention
2025
Total	4,070		4,070		14,369
2024
Total	23,618		23,618		92,293
2023
Total	119,586		119,586		249,862
2022
Total	112,409		112,409		245,540
2021
Total	136,011		136,011		34,516
Prior
Total	221,754		221,754		165,731
Revolving Loans Amortized Cost Basis
Total	97,035		97,035		128,918
Total
Total	724,102		724,102		931,542
Portfolio Segment and Loan Class \| Substandard or Lower
2025
Total	2,882		2,882		15,626
2024
Total	27,640		27,640		61,258
2023
Total	117,989		117,989		152,107
2022
Total	198,700		198,700		116,199
2021
Total	124,820		124,820		87,593
Prior
Total	323,171		323,171		263,711
Revolving Loans Amortized Cost Basis
Total	111,276		111,276		178,256
Total
Total	914,207		914,207		904,806
Portfolio Segment and Loan Class \| Real estate - commercial mortgage
2025
Total	555,666		555,666		633,014
Current period gross charge-offs			0		0
2024
Total	736,728		736,728		1,016,309
Current period gross charge-offs			0		(126)
2023
Total	1,203,401		1,203,401		1,390,901
Current period gross charge-offs			0		(84)
2022
Total	1,369,960		1,369,960		1,569,160
Current period gross charge-offs			(12,354)		0
2021
Total	1,448,212		1,448,212		1,181,456
Current period gross charge-offs			(5,982)		0
Prior
Total	4,351,044		4,351,044		3,715,159
Current period gross charge-offs			(4,078)		(12,950)
Revolving Loans Amortized Cost Basis
Total	68,945		68,945		82,300
Current period gross charge-offs			0		0
Total
Total	9,734,156		9,734,156		9,601,858
Current period gross charge-offs			(22,414)		(13,186)
Portfolio Segment and Loan Class \| Real estate - commercial mortgage \| Pass
2025
Total	552,254		552,254		623,742
2024
Total	714,745		714,745		898,296
2023
Total	1,028,527		1,028,527		1,138,669
2022
Total	1,131,833		1,131,833		1,316,000
2021
Total	1,207,772		1,207,772		1,077,625
Prior
Total	3,939,956		3,939,956		3,414,138
Revolving Loans Amortized Cost Basis
Total	67,232		67,232		69,942
Total
Total	8,642,519		8,642,519		8,548,058
Portfolio Segment and Loan Class \| Real estate - commercial mortgage \| Special Mention
2025
Total	1,193		1,193		4,441
2024
Total	8,781		8,781		73,348
2023
Total	80,578		80,578		149,280
2022
Total	99,915		99,915		157,543
2021
Total	126,475		126,475		28,734
Prior
Total	184,295		184,295		107,099
Revolving Loans Amortized Cost Basis
Total	247		247		10,978
Total
Total	501,484		501,484		531,423
Portfolio Segment and Loan Class \| Real estate - commercial mortgage \| Substandard or Lower
2025
Total	2,219		2,219		4,831
2024
Total	13,202		13,202		44,665
2023
Total	94,296		94,296		102,952
2022
Total	138,212		138,212		95,617
2021
Total	113,965		113,965		75,097
Prior
Total	226,793		226,793		193,922
Revolving Loans Amortized Cost Basis
Total	1,466		1,466		1,380
Total
Total	590,153		590,153		522,377
Portfolio Segment and Loan Class \| Commercial and Industrial
2025
Total	378,429		378,429		456,640
Current period gross charge-offs			(75)		(612)
2024
Total	383,755		383,755		511,646
Current period gross charge-offs			(1,272)		(3,709)
2023
Total	405,833		405,833		567,301
Current period gross charge-offs			(4,652)		(2,560)
2022
Total	500,977		500,977		290,674
Current period gross charge-offs			(3,467)		(4,587)
2021
Total	232,181		232,181		285,534
Current period gross charge-offs			(2,307)		(317)
Prior
Total	953,314		953,314		793,002
Current period gross charge-offs			(3,453)		(7,612)
Revolving Loans Amortized Cost Basis
Total	1,562,365		1,562,365		1,669,896
Current period gross charge-offs			(266)		(3,553)
Total
Total	4,437,905		4,437,905		4,605,589
Current period gross charge-offs			(15,492)		(26,585)
Portfolio Segment and Loan Class \| Commercial and Industrial \| Pass
2025
Total	375,082		375,082		435,917
2024
Total	358,333		358,333		486,720
2023
Total	366,333		366,333		512,622
2022
Total	466,290		466,290		261,603
2021
Total	216,555		216,555		268,194
Prior
Total	840,307		840,307		684,931
Revolving Loans Amortized Cost Basis
Total	1,356,878		1,356,878		1,375,201
Total
Total	3,983,481		3,983,481		4,031,534
Portfolio Segment and Loan Class \| Commercial and Industrial \| Special Mention
2025
Total	2,877		2,877		9,928
2024
Total	13,166		13,166		8,333
2023
Total	17,751		17,751		19,931
2022
Total	7,311		7,311		18,888
2021
Total	5,666		5,666		4,844
Prior
Total	17,319		17,319		58,632
Revolving Loans Amortized Cost Basis
Total	95,702		95,702		117,940
Total
Total	169,411		169,411		238,809
Portfolio Segment and Loan Class \| Commercial and Industrial \| Substandard or Lower
2025
Total	470		470		10,795
2024
Total	12,256		12,256		16,593
2023
Total	21,749		21,749		34,748
2022
Total	27,376		27,376		10,183
2021
Total	9,960		9,960		12,496
Prior
Total	95,688		95,688		49,439
Revolving Loans Amortized Cost Basis
Total	109,785		109,785		176,755
Total
Total	285,013		285,013		335,246
Portfolio Segment and Loan Class \| Real estate - construction(1)
2025
Total	47,880		47,880		197,206
Current period gross charge-offs			0		0
2024
Total	260,058		260,058		504,684
Current period gross charge-offs			0		0
2023
Total	330,716		330,716		252,354
Current period gross charge-offs			0		0
2022
Total	122,725		122,725		116,946
Current period gross charge-offs			(5,287)		0
2021
Total	28,372		28,372		9,722
Current period gross charge-offs			0		0
Prior
Total	53,728		53,728		61,830
Current period gross charge-offs			(100)		0
Revolving Loans Amortized Cost Basis
Total	44,134		44,134		30,729
Current period gross charge-offs			0		0
Total
Total	887,613		887,613		1,175,996
Current period gross charge-offs			(5,387)		0
Portfolio Segment and Loan Class \| Real estate - construction(1) \| Pass
2025
Total	47,880		47,880		197,206
2024
Total	258,892		258,892		494,072
2023
Total	308,902		308,902		157,296
2022
Total	89,044		89,044		37,438
2021
Total	24,337		24,337		8,784
Prior
Total	33,408		33,408		41,480
Revolving Loans Amortized Cost Basis
Total	43,023		43,023		30,608
Total
Total	805,486		805,486		967,503
Portfolio Segment and Loan Class \| Real estate - construction(1) \| Special Mention
2025
Total	0		0		0
2024
Total	1,166		1,166		10,612
2023
Total	20,895		20,895		80,651
2022
Total	3,952		3,952		69,109
2021
Total	3,367		3,367		938
Prior
Total	19,745		19,745		0
Revolving Loans Amortized Cost Basis
Total	1,086		1,086		0
Total
Total	50,211		50,211		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	919		919		14,407
2022
Total	29,729		29,729		10,399
2021
Total	668		668		0
Prior
Total	575		575		20,350
Revolving Loans Amortized Cost Basis
Total	25		25		121
Total
Total	31,916		31,916		47,183
Payment Activity, Aging Status
2025
Total	870,028		870,028		912,394
2024
Total	674,954		674,954		998,060
2023
Total	786,748		786,748		1,804,966
2022
Total	1,611,569		1,611,569		1,815,735
2021
Total	1,690,854		1,690,854		1,087,446
Prior
Total	1,976,511		1,976,511		1,082,486
Revolving Loans Amortized Cost Basis
Total	1,004,295		1,004,295		916,813
Total
Total	8,644,842		8,644,842		8,661,476
Payment Activity, Aging Status \| Performing
2025
Total	869,897		869,897		912,071
2024
Total	673,150		673,150		995,854
2023
Total	783,257		783,257		1,795,602
2022
Total	1,602,301		1,602,301		1,810,796
2021
Total	1,686,632		1,686,632		1,081,147
Prior
Total	1,940,746		1,940,746		1,038,004
Revolving Loans Amortized Cost Basis
Total	1,001,604		1,001,604		913,920
Total
Total	8,584,702		8,584,702		8,587,778
Payment Activity, Aging Status \| Nonperforming
2025
Total	131		131		323
2024
Total	1,804		1,804		2,206
2023
Total	3,491		3,491		9,364
2022
Total	9,268		9,268		4,939
2021
Total	4,222		4,222		6,299
Prior
Total	35,765		35,765		44,482
Revolving Loans Amortized Cost Basis
Total	2,691		2,691		2,893
Total
Total	60,140		60,140		73,698
Payment Activity, Aging Status \| Leases and other loans
2025
Total	142,829		142,829		123,991
Current period gross charge-offs			(1,691)		(1,977)
2024
Total	59,456		59,456		89,006
Current period gross charge-offs			(962)		(913)
2023
Total	76,028		76,028		54,646
Current period gross charge-offs			(404)		(335)
2022
Total					17,638
Current period gross charge-offs			(246)		(334)
2021
Total					10,853
Current period gross charge-offs			(188)		(192)
Prior
Total					19,324
Current period gross charge-offs			(1,004)		(770)
Revolving Loans Amortized Cost Basis
Total	0		0		0
Current period gross charge-offs			0		0
Total
Total	336,973		336,973		315,458
Current period gross charge-offs			(4,495)		(4,696)
Payment Activity, Aging Status \| Leases and other loans \| Pass
2025
Total	142,636		142,636
2024
Total	56,769		56,769
2023
Total	74,641		74,641
2022
Total	32,448		32,448
2021
Total	10,014		10,014
Prior
Total	10,344		10,344
Revolving Loans Amortized Cost Basis
Total	0		0
Total
Total	326,852		326,852
Payment Activity, Aging Status \| Leases and other loans \| Special Mention
2025
Total	0		0
2024
Total	505		505
2023
Total	362		362
2022
Total	1,231		1,231
2021
Total	503		503
Prior
Total	395		395
Revolving Loans Amortized Cost Basis
Total	0		0
Total
Total	2,996		2,996
Payment Activity, Aging Status \| Leases and other loans \| Substandard or Lower
2025
Total	193		193
2024
Total	2,182		2,182
2023
Total	1,025		1,025
2022
Total	3,383		3,383
2021
Total	227		227
Prior
Total	115		115
Revolving Loans Amortized Cost Basis
Total	0		0
Total
Total	7,125		7,125
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	37,062		37,062		744
2021
Total	10,744		10,744		23
Prior
Total	10,854		10,854		9,328
Revolving Loans Amortized Cost Basis
Total					0
Total
Total					12,017
Payment Activity, Aging Status \| Real estate - residential mortgage
2025
Total	541,726		541,726		471,005
Current period gross charge-offs			0		0
2024
Total	532,519		532,519		729,988
Current period gross charge-offs			(19)		(172)
2023
Total	697,499		697,499		1,520,639
Current period gross charge-offs			(188)		(106)
2022
Total	1,448,559		1,448,559		1,730,223
Current period gross charge-offs			(274)		(12)
2021
Total	1,642,544		1,642,544		1,027,639
Current period gross charge-offs			(150)		(43)
Prior
Total	1,754,170		1,754,170		870,149
Current period gross charge-offs			(364)		(888)
Revolving Loans Amortized Cost Basis
Total	0		0		0
Current period gross charge-offs			0		0
Total
Total	6,617,017		6,617,017		6,349,643
Current period gross charge-offs			(995)		(1,472)
Payment Activity, Aging Status \| Real estate - residential mortgage \| Performing
2025
Total	541,726		541,726		470,918
2024
Total	532,128		532,128		728,630
2023
Total	694,700		694,700		1,515,521
2022
Total	1,441,060		1,441,060		1,726,991
2021
Total	1,638,941		1,638,941		1,022,116
Prior
Total	1,723,773		1,723,773		839,566
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	6,572,328		6,572,328		6,303,742
Payment Activity, Aging Status \| Real estate - residential mortgage \| Nonperforming
2025
Total	0		0		87
2024
Total	391		391		1,358
2023
Total	2,799		2,799		5,118
2022
Total	7,499		7,499		3,232
2021
Total	3,603		3,603		5,523
Prior
Total	30,397		30,397		30,583
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	44,689		44,689		45,901
Payment Activity, Aging Status \| Consumer and Real Estate - Home Equity
2025
Total	209,140		209,140		178,958
Current period gross charge-offs			(122)		(118)
2024
Total	27,709		27,709		117,218
Current period gross charge-offs			(208)		(1,016)
2023
Total	82,932		82,932		212,565
Current period gross charge-offs			(795)		(1,552)
2022
Total	156,080		156,080		66,375
Current period gross charge-offs			(1,219)		(790)
2021
Total	48,310		48,310		48,954
Current period gross charge-offs			(524)		(398)
Prior
Total	222,341		222,341		193,013
Current period gross charge-offs			(3,275)		(2,704)
Revolving Loans Amortized Cost Basis
Total	1,004,295		1,004,295		916,813
Current period gross charge-offs			(462)		(75)
Total
Total	1,780,690		1,780,690		1,777,472
Current period gross charge-offs			(6,605)		(8,490)
Payment Activity, Aging Status \| Consumer and Real Estate - Home Equity \| Performing
2025
Total	209,009		209,009		178,722
2024
Total	27,684		27,684		116,370
2023
Total	82,240		82,240		211,647
2022
Total	155,717		155,717		65,412
2021
Total	47,691		47,691		48,201
Prior
Total	216,973		216,973		188,442
Revolving Loans Amortized Cost Basis
Total	1,001,604		1,001,604		913,920
Total
Total	1,768,033		1,768,033		1,763,098
Payment Activity, Aging Status \| Consumer and Real Estate - Home Equity \| Nonperforming
2025
Total	131		131		236
2024
Total	25		25		848
2023
Total	692		692		918
2022
Total	363		363		963
2021
Total	619		619		753
Prior
Total	5,368		5,368		4,571
Revolving Loans Amortized Cost Basis
Total	2,691		2,691		2,893
Total
Total	12,657		12,657		14,374
Payment Activity, Aging Status \| Construction - other
2025
Total	119,162		119,162		138,440
Current period gross charge-offs			0		0
2024
Total	114,726		114,726		61,848
Current period gross charge-offs			0		0
2023
Total	6,317		6,317		17,116
Current period gross charge-offs			0		0
2022
Total	6,930		6,930		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	247,135		247,135		218,903
Current period gross charge-offs			0		0
Payment Activity, Aging Status \| Construction - other \| Performing
2025
Total					138,440
2024
Total	113,338		113,338		61,848
2023
Total	6,317		6,317		15,710
2022
Total	5,524		5,524		1,499
2021
Total	0		0		0
Prior
Total	0		0		0
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	244,341		244,341		217,497
Payment Activity, Aging Status \| Construction - other \| Nonperforming
2025
Total	0		0		0
2024
Total	1,388		1,388		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	2,794		2,794		1,406
Conversion to Term Loan \| Portfolio Segment and Loan Class
Revolving Loans Amortized Cost Basis
Total	21,251		21,251		46,980
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Pass
Revolving Loans Amortized Cost Basis
Total	3,903		3,903		16,611
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Special Mention
Revolving Loans Amortized Cost Basis
Total	9,619		9,619		313
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	7,729		7,729		30,056
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - commercial mortgage
Revolving Loans Amortized Cost Basis
Total	200		200		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	200		200		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	21,051		21,051		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	3,703		3,703		6,346
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Commercial and Industrial \| Special Mention
Revolving Loans Amortized Cost Basis
Total	9,619		9,619		313
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Commercial and Industrial \| Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	7,729		7,729		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	29,883		29,883		43,576
Conversion to Term Loan \| Payment Activity, Aging Status \| Performing
Revolving Loans Amortized Cost Basis
Total	27,115		27,115		40,384
Conversion to Term Loan \| Payment Activity, Aging Status \| Nonperforming
Revolving Loans Amortized Cost Basis
Total	2,768		2,768		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	29,883		29,883		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	27,115		27,115		40,384
Conversion to Term Loan \| Payment Activity, Aging Status \| Consumer and Real Estate - Home Equity \| Nonperforming
Revolving Loans Amortized Cost Basis
Total	2,768		2,768		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