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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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Total
Total	$ 21,177,508		$ 21,177,508		$ 20,279,547
Current period gross charge-offs	(7,279)	$ (3,724)	(28,969)	$ (7,242)
Real estate - commercial mortgage
Total
Total	8,106,300		8,106,300		7,693,835
Gross loans	8,106,300		8,106,300		7,693,835
Commercial and Industrial
Total
Total	4,577,334		4,577,334		4,473,004
Gross loans	4,577,334		4,577,334		4,473,004
Commercial and Industrial \| PPP Loans
Total
Gross loans	6,700		6,700		20,400
Real estate – residential mortgage
Total
Total	5,279,681		5,279,681		4,737,279
Gross loans	5,279,681		5,279,681		4,737,279
Leases and other loans
Total
Total	346,516		346,516		303,487
Gross loans	346,516		346,516		303,487
Portfolio Segment and Loan Class
2023
Total	1,363,647		1,363,647		2,094,526
2022
Total	1,923,940		1,923,940		2,014,166
2021
Total	2,026,558		2,026,558		1,677,176
2020
Total	1,476,067		1,476,067		1,250,572
2019
Total	1,137,238		1,137,238		878,822
Prior
Total	3,895,884		3,895,884		3,649,811
Revolving Loans Amortized Cost Basis
Total	1,670,216		1,670,216		1,624,415
Total
Total	13,543,700		13,543,700		13,190,912
Portfolio Segment and Loan Class \| Pass
2023
Total	1,362,509		1,362,509		2,081,160
2022
Total	1,860,915		1,860,915		1,935,863
2021
Total	1,935,179		1,935,179		1,610,405
2020
Total	1,382,103		1,382,103		1,154,994
2019
Total	1,056,414		1,056,414		831,206
Prior
Total	3,656,068		3,656,068		3,308,374
Revolving Loans Amortized Cost Basis
Total	1,507,919		1,507,919		1,515,897
Total
Total	12,810,113		12,810,113		12,438,824
Portfolio Segment and Loan Class \| Special Mention
2023
Total	739		739		11,500
2022
Total	35,534		35,534		74,846
2021
Total	63,402		63,402		27,059
2020
Total	39,292		39,292		41,882
2019
Total	33,102		33,102		21,423
Prior
Total	128,109		128,109		227,972
Revolving Loans Amortized Cost Basis
Total	57,878		57,878		56,995
Total
Total	358,293		358,293		461,927
Portfolio Segment and Loan Class \| Substandard or Lower
2023
Total	399		399		1,866
2022
Total	27,491		27,491		3,457
2021
Total	27,977		27,977		39,712
2020
Total	54,672		54,672		53,696
2019
Total	47,722		47,722		26,193
Prior
Total	111,707		111,707		113,465
Revolving Loans Amortized Cost Basis
Total	104,419		104,419		51,523
Total
Total	375,294		375,294		290,161
Portfolio Segment and Loan Class \| Real estate - commercial mortgage
2023
Total	599,873		599,873		1,015,702
Current period gross charge-offs			0		0
2022
Total	1,058,077		1,058,077		1,149,131
Current period gross charge-offs			0		0
2021
Total	1,382,679		1,382,679		1,023,456
Current period gross charge-offs			0		0
2020
Total	1,021,407		1,021,407		882,963
Current period gross charge-offs			0		0
2019
Total	819,416		819,416		661,006
Current period gross charge-offs			0		0
Prior
Total	3,130,249		3,130,249		2,879,415
Current period gross charge-offs			(30)		(53)
Revolving Loans Amortized Cost Basis
Total	60,466		60,466		81,855
Current period gross charge-offs			0		0
Total
Total	8,106,300		8,106,300		7,693,835
Current period gross charge-offs			(14,452)		(12,473)
Portfolio Segment and Loan Class \| Real estate - commercial mortgage \| Pass
2023
Total	599,679		599,679		1,014,575
2022
Total	1,018,639		1,018,639		1,095,725
2021
Total	1,307,915		1,307,915		969,118
2020
Total	964,569		964,569		810,850
2019
Total	763,273		763,273		621,689
Prior
Total	2,950,509		2,950,509		2,610,511
Revolving Loans Amortized Cost Basis
Total	57,549		57,549		80,665
Total
Total	7,696,266		7,696,266		7,203,440
Portfolio Segment and Loan Class \| Real estate - commercial mortgage \| Special Mention
2023
Total	0		0		95
2022
Total	24,531		24,531		50,367
2021
Total	48,761		48,761		23,296
2020
Total	6,087		6,087		33,735
2019
Total	28,454		28,454		16,205
Prior
Total	107,064		107,064		181,736
Revolving Loans Amortized Cost Basis
Total	2,430		2,430		947
Total
Total	217,327		217,327		306,381
Portfolio Segment and Loan Class \| Real estate - commercial mortgage \| Substandard or Lower
2023
Total	194		194		1,032
2022
Total	14,907		14,907		3,039
2021
Total	26,003		26,003		31,042
2020
Total	50,751		50,751		38,378
2019
Total	27,689		27,689		23,112
Prior
Total	72,676		72,676		87,168
Revolving Loans Amortized Cost Basis
Total	487		487		243
Total
Total	192,707		192,707		184,014
Portfolio Segment and Loan Class \| Commercial and Industrial
2023
Total	568,997		568,997		919,629
Current period gross charge-offs			0		0
2022
Total	640,601		640,601		474,042
Current period gross charge-offs			0		0
2021
Total	382,462		382,462		406,462
Current period gross charge-offs			0		(36)
2020
Total	362,384		362,384		336,796
Current period gross charge-offs			0		0
2019
Total	307,218		307,218		193,395
Current period gross charge-offs			0		(21)
Prior
Total	707,391		707,391		651,010
Current period gross charge-offs			0		(365)
Revolving Loans Amortized Cost Basis
Total	1,592,264		1,592,264		1,495,086
Current period gross charge-offs			(682)		(1,192)
Total
Total	4,577,334		4,577,334		4,477,537
Current period gross charge-offs			(5,849)		(2,390)
Portfolio Segment and Loan Class \| Commercial and Industrial \| Pass
2023
Total	568,053		568,053		907,390
2022
Total	617,462		617,462		449,145
2021
Total	365,847		365,847		397,881
2020
Total	353,550		353,550		315,605
2019
Total	282,877		282,877		185,096
Prior
Total	670,312		670,312		604,352
Revolving Loans Amortized Cost Basis
Total	1,435,287		1,435,287		1,387,961
Total
Total	4,308,261		4,308,261		4,248,048
Portfolio Segment and Loan Class \| Commercial and Industrial \| Special Mention
2023
Total	739		739		11,405
2022
Total	11,003		11,003		24,479
2021
Total	14,641		14,641		3,763
2020
Total	4,913		4,913		8,147
2019
Total	4,648		4,648		5,218
Prior
Total	13,313		13,313		24,633
Revolving Loans Amortized Cost Basis
Total	55,448		55,448		56,048
Total
Total	104,942		104,942		133,943
Portfolio Segment and Loan Class \| Commercial and Industrial \| Substandard or Lower
2023
Total	205		205		834
2022
Total	12,136		12,136		418
2021
Total	1,974		1,974		4,818
2020
Total	3,921		3,921		13,044
2019
Total	19,693		19,693		3,081
Prior
Total	23,766		23,766		22,025
Revolving Loans Amortized Cost Basis
Total	101,529		101,529		51,077
Total
Total	164,131		164,131		95,546
Portfolio Segment and Loan Class \| Real estate - construction(2)
2023
Total	194,777		194,777		159,195
Current period gross charge-offs			0		0
2022
Total	225,262		225,262		390,993
Current period gross charge-offs			0		0
2021
Total	261,417		261,417		247,258
Current period gross charge-offs			0		0
2020
Total	92,276		92,276		30,813
Current period gross charge-offs			0		0
2019
Total	10,604		10,604		24,421
Current period gross charge-offs			0		0
Prior
Total	58,244		58,244		119,386
Current period gross charge-offs			0		0
Revolving Loans Amortized Cost Basis
Total	17,486		17,486		47,474
Current period gross charge-offs			0		0
Total
Total	860,066		860,066		1,019,540
Current period gross charge-offs			0		0
Portfolio Segment and Loan Class \| Real estate - construction(2) \| Pass
2023
Total	194,777		194,777		159,195
2022
Total	224,814		224,814		390,993
2021
Total	261,417		261,417		243,406
2020
Total	63,984		63,984		28,539
2019
Total	10,264		10,264		24,421
Prior
Total	35,247		35,247		93,511
Revolving Loans Amortized Cost Basis
Total	15,083		15,083		47,271
Total
Total	805,586		805,586		987,336
Portfolio Segment and Loan Class \| Real estate - construction(2) \| Special Mention
2023
Total	0		0		0
2022
Total	0		0		0
2021
Total	0		0		0
2020
Total	28,292		28,292		0
2019
Total	0		0		0
Prior
Total	7,732		7,732		21,603
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	36,024		36,024		21,603
Portfolio Segment and Loan Class \| Real estate - construction(2) \| Substandard or Lower
2023
Total	0		0		0
2022
Total	448		448		0
2021
Total	0		0		3,852
2020
Total	0		0		2,274
2019
Total	340		340		0
Prior
Total	15,265		15,265		4,272
Revolving Loans Amortized Cost Basis
Total	2,403		2,403		203
Total
Total	18,456		18,456		10,601
Payment Activity, Aging Status
2023
Total	1,028,609		1,028,609		1,663,147
2022
Total	1,606,343		1,606,343		1,936,748
2021
Total	1,844,294		1,844,294		1,192,235
2020
Total	1,098,556		1,098,556		374,362
2019
Total	335,990		335,990		153,878
Prior
Total	909,562		909,562		889,588
Revolving Loans Amortized Cost Basis
Total	800,080		800,080		843,948
Total
Total	7,633,808		7,633,808		7,088,635
Payment Activity, Aging Status \| Performing
2023
Total	1,028,589		1,028,589		1,661,656
2022
Total	1,605,115		1,605,115		1,931,346
2021
Total	1,839,777		1,839,777		1,185,464
2020
Total	1,093,117		1,093,117		367,860
2019
Total	330,095		330,095		149,193
Prior
Total	866,093		866,093		847,213
Revolving Loans Amortized Cost Basis
Total	798,617		798,617		842,226
Total
Total	7,570,924		7,570,924		7,019,019
Payment Activity, Aging Status \| Nonperforming
2023
Total	20		20		1,491
2022
Total	1,228		1,228		5,402
2021
Total	4,517		4,517		6,771
2020
Total	5,439		5,439		6,502
2019
Total	5,895		5,895		4,685
Prior
Total	43,469		43,469		42,375
Revolving Loans Amortized Cost Basis
Total	1,463		1,463		1,722
Total
Total	62,884		62,884		69,616
Payment Activity, Aging Status \| Real estate – residential mortgage
2023
Total	540,015		540,015		935,102
Current period gross charge-offs			0		0
2022
Total	1,098,769		1,098,769		1,713,807
Current period gross charge-offs			0		0
2021
Total	1,705,938		1,705,938		1,060,723
Current period gross charge-offs			0		0
2020
Total	1,004,677		1,004,677		292,633
Current period gross charge-offs			0		0
2019
Total	275,289		275,289		92,042
Current period gross charge-offs			0		0
Prior
Total	654,993		654,993		642,972
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	5,279,681		5,279,681		4,737,279
Current period gross charge-offs			(62)		(66)
Payment Activity, Aging Status \| Real estate – residential mortgage \| Performing
2023
Total	540,015		540,015		933,903
2022
Total	1,097,965		1,097,965		1,708,703
2021
Total	1,702,327		1,702,327		1,054,126
2020
Total	999,666		999,666		286,167
2019
Total	269,656		269,656		87,455
Prior
Total	629,492		629,492		620,416
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	5,239,121		5,239,121		4,690,770
Payment Activity, Aging Status \| Real estate – residential mortgage \| Nonperforming
2023
Total	0		0		1,199
2022
Total	804		804		5,104
2021
Total	3,611		3,611		6,597
2020
Total	5,011		5,011		6,466
2019
Total	5,633		5,633		4,587
Prior
Total	25,501		25,501		22,556
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	40,560		40,560		46,509
Payment Activity, Aging Status \| Consumer and Home Equity
2023
Total	248,519		248,519		416,923
Current period gross charge-offs			0		0
2022
Total	296,608		296,608		110,022
Current period gross charge-offs			0		(587)
2021
Total	92,782		92,782		80,596
Current period gross charge-offs			0		(70)
2020
Total	67,963		67,963		52,420
Current period gross charge-offs			0		(108)
2019
Total	41,551		41,551		45,740
Current period gross charge-offs			0		(16)
Prior
Total	231,537		231,537		217,639
Current period gross charge-offs			(523)		(442)
Revolving Loans Amortized Cost Basis
Total	800,080		800,080		843,948
Current period gross charge-offs			(22)		(178)
Total
Total	1,789,414		1,789,414		1,802,017
Current period gross charge-offs			(5,322)		(4,412)
Payment Activity, Aging Status \| Consumer and Home Equity \| Performing
2023
Total	248,499		248,499		416,631
2022
Total	296,227		296,227		109,724
2021
Total	91,876		91,876		80,422
2020
Total	67,535		67,535		52,384
2019
Total	41,289		41,289		45,642
Prior
Total	224,270		224,270		211,127
Revolving Loans Amortized Cost Basis
Total	798,617		798,617		842,226
Total
Total	1,777,834		1,777,834		1,792,217
Payment Activity, Aging Status \| Consumer and Home Equity \| Nonperforming
2023
Total	20		20		292
2022
Total	381		381		298
2021
Total	906		906		174
2020
Total	428		428		36
2019
Total	262		262		98
Prior
Total	7,267		7,267		6,512
Revolving Loans Amortized Cost Basis
Total	1,463		1,463		1,722
Total
Total	11,580		11,580		9,800
Payment Activity, Aging Status \| Construction - other
2023
Total	81,142		81,142		164,924
Current period gross charge-offs			0		0
2022
Total	121,659		121,659		73,492
Current period gross charge-offs			0		0
2021
Total	14,666		14,666		10,892
Current period gross charge-offs			0		0
2020
Total	730		730		0
Current period gross charge-offs			0		0
2019
Total	0		0		1,077
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	218,197		218,197		250,385
Current period gross charge-offs			0		0
Payment Activity, Aging Status \| Construction - other \| Performing
2023
Total	81,142		81,142		164,924
2022
Total	121,659		121,659		73,492
2021
Total	14,666		14,666		10,892
2020
Total	730		730		0
2019
Total	0		0		1,077
Prior
Total	0		0		0
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	218,197		218,197		250,385
Payment Activity, Aging Status \| Construction - other \| Nonperforming
2023
Total	0		0		0
2022
Total	0		0		0
2021
Total	0		0		0
2020
Total	0		0		0
2019
Total	0		0		0
Prior
Total	0		0		0
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	0		0		0
Payment Activity, Aging Status \| Leases and other loans
2023
Total	158,933		158,933		146,198
Current period gross charge-offs			(471)		(506)
2022
Total	89,307		89,307		39,427
Current period gross charge-offs			(521)		(167)
2021
Total	30,908		30,908		40,024
Current period gross charge-offs			(246)		(140)
2020
Total	25,186		25,186		29,309
Current period gross charge-offs			(128)		(80)
2019
Total	19,150		19,150		15,019
Current period gross charge-offs			(82)		(47)
Prior
Total	23,032		23,032		28,977
Current period gross charge-offs			(656)		(1,191)
Revolving Loans Amortized Cost Basis
Total	0		0		0
Current period gross charge-offs			0		0
Total
Total	346,516		346,516		298,954
Current period gross charge-offs			(3,284)		(2,131)
Payment Activity, Aging Status \| Leases and other loans \| Performing
2023
Total	158,933		158,933		146,198
2022
Total	89,264		89,264		39,427
2021
Total	30,908		30,908		40,024
2020
Total	25,186		25,186		29,309
2019
Total	19,150		19,150		15,019
Prior
Total	12,331		12,331		15,670
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	335,772		335,772		285,647
Payment Activity, Aging Status \| Leases and other loans \| Nonperforming
2023
Total	0		0		0
2022
Total	43		43		0
2021
Total	0		0		0
2020
Total	0		0		0
2019
Total	0		0		0
Prior
Total	10,701		10,701		13,307
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	10,744		10,744		13,307
Conversion to Term Loan \| Portfolio Segment and Loan Class
Revolving Loans Amortized Cost Basis
Total	50,150		50,150		1,424
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Pass
Revolving Loans Amortized Cost Basis
Total	49,006		49,006		925
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Special Mention
Revolving Loans Amortized Cost Basis
Total	237		237		250
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	907		907		249
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - commercial mortgage
Revolving Loans Amortized Cost Basis
Total	34,133		34,133		307
Current period gross charge-offs			(14,422)		(12,420)
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - commercial mortgage \| Pass
Revolving Loans Amortized Cost Basis
Total	34,133		34,133		307
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		0
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Commercial and Industrial
Revolving Loans Amortized Cost Basis
Total	16,017		16,017		1,117
Current period gross charge-offs			(5,167)		(776)
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Commercial and Industrial \| Pass
Revolving Loans Amortized Cost Basis
Total	14,873		14,873		618
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Commercial and Industrial \| Special Mention
Revolving Loans Amortized Cost Basis
Total	237		237		250
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Commercial and Industrial \| Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	907		907		249
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - construction(2)
Revolving Loans Amortized Cost Basis
Total	0		0		0
Current period gross charge-offs			0		0
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - construction(2) \| Pass
Revolving Loans Amortized Cost Basis
Total	0		0		0
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - construction(2) \| Special Mention
Revolving Loans Amortized Cost Basis
Total	0		0		0
Conversion to Term Loan \| Portfolio Segment and Loan Class \| Real estate - construction(2) \| Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	0		0		0
Conversion to Term Loan \| Payment Activity, Aging Status
Revolving Loans Amortized Cost Basis
Total	10,374		10,374		34,729
Conversion to Term Loan \| Payment Activity, Aging Status \| Performing
Revolving Loans Amortized Cost Basis
Total	9,521		9,521		34,061
Conversion to Term Loan \| Payment Activity, Aging Status \| Nonperforming
Revolving Loans Amortized Cost Basis
Total	853		853		668
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			(62)		(66)
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	10,374		10,374		34,729
Current period gross charge-offs			(4,777)		(3,011)
Conversion to Term Loan \| Payment Activity, Aging Status \| Consumer and Home Equity \| Performing
Revolving Loans Amortized Cost Basis
Total	9,521		9,521		34,061
Conversion to Term Loan \| Payment Activity, Aging Status \| Consumer and Home Equity \| Nonperforming
Revolving Loans Amortized Cost Basis
Total	853		853		668
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			(1,180)		0
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