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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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Total
Total	$ 24,106,297		$ 24,106,297		$ 21,351,094
Current period gross charge-offs	(14,007)	$ (4,787)	(24,959)	$ (21,690)
Real estate - commercial mortgage
Total
Total	9,289,770		9,289,770		8,127,728
Gross loans	9,289,770		9,289,770		8,127,728
Commercial and Industrial
Total
Total	4,967,796		4,967,796		4,545,552
Gross loans	4,967,796		4,967,796		4,545,552
Real estate - residential mortgage
Total
Total	6,248,856		6,248,856		5,325,923
Gross loans	6,248,856		6,248,856		5,325,923
Leases and other loans
Total
Total	323,112		323,112		336,314
Gross loans	323,112		323,112		336,314
Portfolio Segment and Loan Class
2024
Total	609,204		609,204		1,744,297
2023
Total	1,987,620		1,987,620		1,953,966
2022
Total	2,345,343		2,345,343		1,981,737
2021
Total	2,177,777		2,177,777		1,428,026
2020
Total	1,535,421		1,535,421		1,091,506
Prior
Total	4,962,763		4,962,763		3,727,931
Revolving Loans Amortized Cost Basis
Total	1,864,030		1,864,030		1,696,870
Total
Total	15,503,523		15,503,523		13,675,866
Portfolio Segment and Loan Class \| Pass
2024
Total	589,416		589,416		1,732,981
2023
Total	1,871,863		1,871,863		1,841,229
2022
Total	1,982,375		1,982,375		1,796,011
2021
Total	1,757,631		1,757,631		1,363,602
2020
Total	1,356,989		1,356,989		1,003,493
Prior
Total	4,383,330		4,383,330		3,455,090
Revolving Loans Amortized Cost Basis
Total	1,543,388		1,543,388		1,516,133
Total
Total	13,501,770		13,501,770		12,750,911
Portfolio Segment and Loan Class \| Special Mention
2024
Total	10,744		10,744		10,703
2023
Total	101,702		101,702		66,074
2022
Total	256,082		256,082		147,582
2021
Total	322,636		322,636		11,439
2020
Total	106,479		106,479		42,106
Prior
Total	324,131		324,131		124,273
Revolving Loans Amortized Cost Basis
Total	150,911		150,911		74,535
Total
Total	1,275,904		1,275,904		476,910
Portfolio Segment and Loan Class \| Substandard or Lower
2024
Total	9,044		9,044		613
2023
Total	14,055		14,055		46,663
2022
Total	106,886		106,886		38,144
2021
Total	97,510		97,510		52,985
2020
Total	71,953		71,953		45,907
Prior
Total	255,302		255,302		148,568
Revolving Loans Amortized Cost Basis
Total	169,731		169,731		106,202
Total
Total	725,849		725,849		448,045
Portfolio Segment and Loan Class \| Real estate - commercial mortgage
2024
Total	311,424		311,424		786,806
Current period gross charge-offs			0		0
2023
Total	938,362		938,362		1,057,879
Current period gross charge-offs			0		0
2022
Total	1,288,672		1,288,672		1,340,341
Current period gross charge-offs			(84)		0
2021
Total	1,570,935		1,570,935		1,041,962
Current period gross charge-offs			0		0
2020
Total	1,188,108		1,188,108		783,725
Current period gross charge-offs			0		0
Prior
Total	3,911,256		3,911,256		3,023,562
Current period gross charge-offs			(7,769)		(424)
Revolving Loans Amortized Cost Basis
Total	79,482		79,482		61,817
Current period gross charge-offs			0		0
Total
Total	9,289,770		9,289,770		8,127,728
Current period gross charge-offs			(7,879)		(17,999)
Portfolio Segment and Loan Class \| Real estate - commercial mortgage \| Pass
2024
Total	309,982		309,982		783,673
2023
Total	863,950		863,950		993,017
2022
Total	1,071,750		1,071,750		1,203,852
2021
Total	1,271,714		1,271,714		984,958
2020
Total	1,045,978		1,045,978		721,857
Prior
Total	3,529,987		3,529,987		2,822,155
Revolving Loans Amortized Cost Basis
Total	67,395		67,395		59,253
Total
Total	8,160,756		8,160,756		7,600,401
Portfolio Segment and Loan Class \| Real estate - commercial mortgage \| Special Mention
2024
Total	1,226		1,226		2,767
2023
Total	64,073		64,073		43,904
2022
Total	156,132		156,132		105,185
2021
Total	221,347		221,347		7,862
2020
Total	78,390		78,390		35,289
Prior
Total	222,166		222,166		105,786
Revolving Loans Amortized Cost Basis
Total	10,166		10,166		1,760
Total
Total	755,031		755,031		302,553
Portfolio Segment and Loan Class \| Real estate - commercial mortgage \| Substandard or Lower
2024
Total	216		216		366
2023
Total	10,339		10,339		20,958
2022
Total	60,790		60,790		31,304
2021
Total	77,874		77,874		49,142
2020
Total	63,740		63,740		26,579
Prior
Total	159,103		159,103		95,621
Revolving Loans Amortized Cost Basis
Total	1,921		1,921		804
Total
Total	373,983		373,983		224,774
Portfolio Segment and Loan Class \| Commercial and Industrial
2024
Total	244,620		244,620		634,569
Current period gross charge-offs			(370)		0
2023
Total	576,403		576,403		624,864
Current period gross charge-offs			(1,420)		(299)
2022
Total	668,466		668,466		351,686
Current period gross charge-offs			(29)		0
2021
Total	384,832		384,832		348,638
Current period gross charge-offs			(273)		0
2020
Total	338,109		338,109		297,931
Current period gross charge-offs			(57)		0
Prior
Total	981,655		981,655		648,988
Current period gross charge-offs			(742)		(249)
Revolving Loans Amortized Cost Basis
Total	1,755,157		1,755,157		1,621,208
Current period gross charge-offs			(4,061)		(682)
Total
Total	4,967,796		4,967,796		4,545,552
Current period gross charge-offs			(10,587)		(9,246)
Portfolio Segment and Loan Class \| Commercial and Industrial \| Pass
2024
Total	226,274		226,274		626,386
2023
Total	549,429		549,429		590,132
2022
Total	588,898		588,898		330,576
2021
Total	324,519		324,519		341,218
2020
Total	304,830		304,830		272,126
Prior
Total	812,912		812,912		598,838
Revolving Loans Amortized Cost Basis
Total	1,449,696		1,449,696		1,443,203
Total
Total	4,273,336		4,273,336		4,213,215
Portfolio Segment and Loan Class \| Commercial and Industrial \| Special Mention
2024
Total	9,518		9,518		7,936
2023
Total	23,258		23,258		9,548
2022
Total	46,588		46,588		16,499
2021
Total	52,606		52,606		3,577
2020
Total	25,066		25,066		6,817
Prior
Total	98,739		98,739		18,487
Revolving Loans Amortized Cost Basis
Total	137,793		137,793		72,775
Total
Total	393,976		393,976		135,837
Portfolio Segment and Loan Class \| Commercial and Industrial \| Substandard or Lower
2024
Total	8,828		8,828		247
2023
Total	3,716		3,716		25,184
2022
Total	32,980		32,980		4,611
2021
Total	7,707		7,707		3,843
2020
Total	8,213		8,213		18,988
Prior
Total	70,004		70,004		31,663
Revolving Loans Amortized Cost Basis
Total	167,668		167,668		105,230
Total
Total	300,484		300,484		196,500
Portfolio Segment and Loan Class \| Real estate - construction(1)
2024
Total	53,160		53,160		322,922
Current period gross charge-offs			0		0
2023
Total	472,855		472,855		271,223
Current period gross charge-offs			0		0
2022
Total	388,205		388,205		289,710
Current period gross charge-offs			0		0
2021
Total	222,010		222,010		37,426
Current period gross charge-offs			0		0
2020
Total	9,204		9,204		9,850
Current period gross charge-offs			0		0
Prior
Total	69,852		69,852		55,381
Current period gross charge-offs			0		0
Revolving Loans Amortized Cost Basis
Total	29,391		29,391		13,845
Current period gross charge-offs			0		0
Total
Total	1,245,957		1,245,957		1,002,586
Current period gross charge-offs			0		0
Portfolio Segment and Loan Class \| Real estate - construction(1) \| Pass
2024
Total	53,160		53,160		322,922
2023
Total	458,484		458,484		258,080
2022
Total	321,727		321,727		261,583
2021
Total	161,398		161,398		37,426
2020
Total	6,181		6,181		9,510
Prior
Total	40,431		40,431		34,097
Revolving Loans Amortized Cost Basis
Total	26,297		26,297		13,677
Total
Total	1,067,678		1,067,678		937,295
Portfolio Segment and Loan Class \| Real estate - construction(1) \| Special Mention
2024
Total	0		0		0
2023
Total	14,371		14,371		12,622
2022
Total	53,362		53,362		25,898
2021
Total	48,683		48,683		0
2020
Total	3,023		3,023		0
Prior
Total	3,226		3,226		0
Revolving Loans Amortized Cost Basis
Total	2,952		2,952		0
Total
Total	126,897		126,897		38,520
Portfolio Segment and Loan Class \| Real estate - construction(1) \| Substandard or Lower
2024
Total	0		0		0
2023
Total	0		0		521
2022
Total	13,116		13,116		2,229
2021
Total	11,929		11,929		0
2020
Total	0		0		340
Prior
Total	26,195		26,195		21,284
Revolving Loans Amortized Cost Basis
Total	142		142		168
Total
Total	51,382		51,382		26,771
Payment Activity, Aging Status
2024
Total	494,405		494,405		1,189,985
2023
Total	1,074,236		1,074,236		1,583,817
2022
Total	1,910,321		1,910,321		1,815,951
2021
Total	1,890,800		1,890,800		1,074,318
2020
Total	1,140,760		1,140,760		320,549
Prior
Total	1,205,040		1,205,040		861,819
Revolving Loans Amortized Cost Basis
Total	874,697		874,697		807,084
Total
Total	8,602,774		8,602,774		7,675,228
Payment Activity, Aging Status \| Performing
2024
Total	494,402		494,402		1,189,690
2023
Total	1,072,793		1,072,793		1,579,989
2022
Total	1,904,972		1,904,972		1,810,197
2021
Total	1,886,301		1,886,301		1,069,335
2020
Total	1,135,627		1,135,627		313,962
Prior
Total	1,159,690		1,159,690		821,913
Revolving Loans Amortized Cost Basis
Total	872,989		872,989		805,645
Total
Total	8,538,388		8,538,388		7,610,775
Payment Activity, Aging Status \| Nonperforming
2024
Total	3		3		295
2023
Total	1,443		1,443		3,828
2022
Total	5,349		5,349		5,754
2021
Total	4,499		4,499		4,983
2020
Total	5,133		5,133		6,587
Prior
Total	45,350		45,350		39,906
Revolving Loans Amortized Cost Basis
Total	1,708		1,708		1,439
Total
Total	64,386		64,386		64,453
Payment Activity, Aging Status \| Real estate - residential mortgage
2024
Total	223,893		223,893		623,247
Current period gross charge-offs			0		0
2023
Total	694,761		694,761		1,128,376
Current period gross charge-offs			0		0
2022
Total	1,544,107		1,544,107		1,687,647
Current period gross charge-offs			0		0
2021
Total	1,783,221		1,783,221		988,751
Current period gross charge-offs			0		0
2020
Total	1,068,368		1,068,368		266,282
Current period gross charge-offs			0		0
Prior
Total	934,506		934,506		631,620
Current period gross charge-offs			(35)		0
Revolving Loans Amortized Cost Basis
Total	0		0		0
Current period gross charge-offs			0		0
Total
Total	6,248,856		6,248,856		5,325,923
Current period gross charge-offs			(286)		(62)
Payment Activity, Aging Status \| Real estate - residential mortgage \| Performing
2024
Total	223,893		223,893		623,247
2023
Total	693,496		693,496		1,126,656
2022
Total	1,541,848		1,541,848		1,682,759
2021
Total	1,779,390		1,779,390		984,050
2020
Total	1,063,559		1,063,559		260,049
Prior
Total	905,637		905,637		607,133
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	6,207,823		6,207,823		5,283,894
Payment Activity, Aging Status \| Real estate - residential mortgage \| Nonperforming
2024
Total	0		0		0
2023
Total	1,265		1,265		1,720
2022
Total	2,259		2,259		4,888
2021
Total	3,831		3,831		4,701
2020
Total	4,809		4,809		6,233
Prior
Total	28,869		28,869		24,487
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	41,033		41,033		42,029
Payment Activity, Aging Status \| Consumer and Home Equity
2024
Total	160,104		160,104		272,866
Current period gross charge-offs			(1)		(119)
2023
Total	136,590		136,590		276,828
Current period gross charge-offs			(326)		0
2022
Total	251,122		251,122		86,851
Current period gross charge-offs			(477)		0
2021
Total	78,497		78,497		62,708
Current period gross charge-offs			(125)		0
2020
Total	56,346		56,346		38,021
Current period gross charge-offs			(142)		0
Prior
Total	243,093		243,093		210,439
Current period gross charge-offs			(1,096)		(525)
Revolving Loans Amortized Cost Basis
Total	874,697		874,697		807,084
Current period gross charge-offs			0		(283)
Total
Total	1,812,964		1,812,964		1,776,502
Current period gross charge-offs			(4,004)		(7,514)
Payment Activity, Aging Status \| Consumer and Home Equity \| Performing
2024
Total	160,101		160,101		272,571
2023
Total	136,412		136,412		276,373
2022
Total	250,006		250,006		85,985
2021
Total	77,901		77,901		62,426
2020
Total	56,063		56,063		37,667
Prior
Total	235,923		235,923		204,913
Revolving Loans Amortized Cost Basis
Total	872,989		872,989		805,645
Total
Total	1,801,009		1,801,009		1,765,624
Payment Activity, Aging Status \| Consumer and Home Equity \| Nonperforming
2024
Total	3		3		295
2023
Total	178		178		455
2022
Total	1,116		1,116		866
2021
Total	596		596		282
2020
Total	283		283		354
Prior
Total	7,170		7,170		5,526
Revolving Loans Amortized Cost Basis
Total	1,708		1,708		1,439
Total
Total	11,955		11,955		10,878
Payment Activity, Aging Status \| Construction - other
2024
Total	32,808		32,808		127,382
Current period gross charge-offs			0		0
2023
Total	135,217		135,217		94,854
Current period gross charge-offs			0		0
2022
Total	43,506		43,506		13,698
Current period gross charge-offs			0		0
2021
Total	6,311		6,311		555
Current period gross charge-offs			0		0
2020
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	217,842		217,842		236,489
Current period gross charge-offs			0		0
Payment Activity, Aging Status \| Construction - other \| Performing
2024
Total	32,808		32,808		127,382
2023
Total	135,217		135,217		93,319
2022
Total	42,100		42,100		13,698
2021
Total	6,311		6,311		555
2020
Total	0		0		0
Prior
Total	0		0		0
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	216,436		216,436		234,954
Payment Activity, Aging Status \| Construction - other \| Nonperforming
2024
Total	0		0		0
2023
Total	0		0		1,535
2022
Total	1,406		1,406		0
2021
Total	0		0		0
2020
Total	0		0		0
Prior
Total	0		0		0
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	1,406		1,406		1,535
Payment Activity, Aging Status \| Leases and other loans
2024
Total	77,600		77,600		166,490
Current period gross charge-offs			(585)		(471)
2023
Total	107,668		107,668		83,759
Current period gross charge-offs			(559)		(521)
2022
Total	71,586		71,586		27,755
Current period gross charge-offs			(159)		(246)
2021
Total	22,771		22,771		22,304
Current period gross charge-offs			(193)		(128)
2020
Total	16,046		16,046		16,246
Current period gross charge-offs			(63)		(82)
Prior
Total	27,441		27,441		19,760
Current period gross charge-offs			(343)		(656)
Revolving Loans Amortized Cost Basis
Total	0		0		0
Current period gross charge-offs			(125)		(765)
Total
Total	323,112		323,112		336,314
Current period gross charge-offs			(2,203)		(4,380)
Payment Activity, Aging Status \| Leases and other loans \| Performing
2024
Total	77,600		77,600		166,490
2023
Total	107,668		107,668		83,641
2022
Total	71,018		71,018		27,755
2021
Total	22,699		22,699		22,304
2020
Total	16,005		16,005		16,246
Prior
Total	18,130		18,130		9,867
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	313,120		313,120		326,303
Payment Activity, Aging Status \| Leases and other loans \| Nonperforming
2024
Total	0		0		0
2023
Total	0		0		118
2022
Total	568		568		0
2021
Total	72		72		0
2020
Total	41		41		0
Prior
Total	9,311		9,311		9,893
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	9,992		9,992		10,011
Conversion to Term Loan \| Portfolio Segment and Loan Class
Revolving Loans Amortized Cost Basis
Total	21,365		21,365		51,533
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Pass
Revolving Loans Amortized Cost Basis
Total	16,778		16,778		42,372
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Special Mention
Revolving Loans Amortized Cost Basis
Total	3,219		3,219		198
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	1,368		1,368		8,963
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - commercial mortgage
Revolving Loans Amortized Cost Basis
Total	1,531		1,531		31,636
Current period gross charge-offs			(26)		(17,575)
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - commercial mortgage \| Pass
Revolving Loans Amortized Cost Basis
Total	0		0		31,636
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - commercial mortgage \| Special Mention
Revolving Loans Amortized Cost Basis
Total	1,531		1,531		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		0
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Commercial and Industrial
Revolving Loans Amortized Cost Basis
Total	18,554		18,554		17,668
Current period gross charge-offs			(3,635)		(8,016)
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Commercial and Industrial \| Pass
Revolving Loans Amortized Cost Basis
Total	16,778		16,778		10,736
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Commercial and Industrial \| Special Mention
Revolving Loans Amortized Cost Basis
Total	408		408		198
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Commercial and Industrial \| Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	1,368		1,368		6,734
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - construction(1)
Revolving Loans Amortized Cost Basis
Total	1,280		1,280		2,229
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		0
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - construction(1) \| Special Mention
Revolving Loans Amortized Cost Basis
Total	1,280		1,280		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		2,229
Conversion to Term Loan \| Payment Activity, Aging Status
Revolving Loans Amortized Cost Basis
Total	12,515		12,515		21,705
Conversion to Term Loan \| Payment Activity, Aging Status \| Performing
Revolving Loans Amortized Cost Basis
Total	11,614		11,614		20,044
Conversion to Term Loan \| Payment Activity, Aging Status \| Nonperforming
Revolving Loans Amortized Cost Basis
Total	901		901		1,661
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			(251)		(62)
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 Home Equity
Revolving Loans Amortized Cost Basis
Total	12,515		12,515		21,705
Current period gross charge-offs			(1,837)		(6,587)
Conversion to Term Loan \| Payment Activity, Aging Status \| Consumer and Home Equity \| Performing
Revolving Loans Amortized Cost Basis
Total	11,614		11,614		20,044
Conversion to Term Loan \| Payment Activity, Aging Status \| Consumer and Home Equity \| Nonperforming
Revolving Loans Amortized Cost Basis
Total	901		901		1,661
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
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			(176)		(1,511)
Conversion to Term Loan \| Payment Activity, Aging Status \| Leases and other loans \| Performing
Revolving Loans Amortized Cost Basis
Total	0		0		0
Conversion to Term Loan \| Payment Activity, Aging Status \| Leases and other loans \| Nonperforming
Revolving Loans Amortized Cost Basis
Total	$ 0		$ 0		$ 0