Loans and Allowance for Credit Losses Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Total
Total	$ 21,044,685		$ 21,044,685		$ 20,279,547
Current period gross charge-offs	(4,787)	$ (1,618)	(21,690)	$ (3,518)
Gross loans	21,076,569		21,076,569		20,308,924
Real estate - commercial mortgage
Total
Total	7,846,861		7,846,861		7,693,835
Gross loans	7,846,861		7,846,861		7,693,835
Commercial and Industrial
Total
Total	4,602,446		4,602,446		4,477,537
Gross loans	4,602,446		4,602,446		4,477,537
Commercial and Industrial | PPP Loans
Total
Gross loans	9,800		9,800		20,400
Real estate – residential mortgage
Total
Total	5,147,262		5,147,262		4,737,279
Gross loans	5,147,262		5,147,262		4,737,279
Leases and other loans
Total
Total	314,131		314,131		298,954
Gross loans	346,015		346,015		328,331
Portfolio Segment and Loan Class
2023
Total	1,001,618		1,001,618		2,094,526
2022
Total	1,927,611		1,927,611		2,014,166
2021
Total	2,047,018		2,047,018		1,677,176
2020
Total	1,523,665		1,523,665		1,250,572
2019
Total	1,162,010		1,162,010		878,822
Prior
Total	4,150,246		4,150,246		3,649,811
Revolving Loans Amortized Cost Basis
Total	1,696,616		1,696,616		1,624,415
Total
Total	13,523,505		13,523,505		13,190,912
Portfolio Segment and Loan Class | Pass
2023
Total	1,000,819		1,000,819		2,081,160
2022
Total	1,884,657		1,884,657		1,935,863
2021
Total	1,937,723		1,937,723		1,610,405
2020
Total	1,424,252		1,424,252		1,154,994
2019
Total	1,073,409		1,073,409		831,206
Prior
Total	3,839,001		3,839,001		3,308,374
Revolving Loans Amortized Cost Basis
Total	1,548,427		1,548,427		1,515,897
Total
Total	12,721,251		12,721,251		12,438,824
Portfolio Segment and Loan Class | Special Mention
2023
Total	392		392		11,500
2022
Total	34,371		34,371		74,846
2021
Total	82,331		82,331		27,059
2020
Total	51,154		51,154		41,882
2019
Total	41,894		41,894		21,423
Prior
Total	177,155		177,155		227,972
Revolving Loans Amortized Cost Basis
Total	61,242		61,242		56,995
Total
Total	449,287		449,287		461,927
Portfolio Segment and Loan Class | Substandard or Lower
2023
Total	407		407		1,866
2022
Total	8,583		8,583		3,457
2021
Total	26,964		26,964		39,712
2020
Total	48,259		48,259		53,696
2019
Total	46,707		46,707		26,193
Prior
Total	134,090		134,090		113,465
Revolving Loans Amortized Cost Basis
Total	86,947		86,947		51,523
Total
Total	352,967		352,967		290,161
Portfolio Segment and Loan Class | Real estate - commercial mortgage
2023
Total	436,415		436,415		1,015,702
Current period gross charge-offs			0		0
2022
Total	1,036,707		1,036,707		1,149,131
Current period gross charge-offs			0		0
2021
Total	1,174,780		1,174,780		1,023,456
Current period gross charge-offs			0		0
2020
Total	994,366		994,366		882,963
Current period gross charge-offs			0		0
2019
Total	825,469		825,469		661,006
Current period gross charge-offs			0		0
Prior
Total	3,274,983		3,274,983		2,879,415
Current period gross charge-offs			(30)		(53)
Revolving Loans Amortized Cost Basis
Total	100,229		100,229		81,855
Current period gross charge-offs			0		0
Total
Total	7,846,861		7,846,861		7,693,835
Current period gross charge-offs			(13,592)		(12,473)
Portfolio Segment and Loan Class | Real estate - commercial mortgage | Pass
2023
Total	436,213		436,213		1,014,575
2022
Total	1,014,277		1,014,277		1,095,725
2021
Total	1,079,313		1,079,313		969,118
2020
Total	931,445		931,445		810,850
2019
Total	761,840		761,840		621,689
Prior
Total	3,044,060		3,044,060		2,610,511
Revolving Loans Amortized Cost Basis
Total	98,737		98,737		80,665
Total
Total	7,369,797		7,369,797		7,203,440
Portfolio Segment and Loan Class | Real estate - commercial mortgage | Special Mention
2023
Total	0		0		95
2022
Total	17,541		17,541		50,367
2021
Total	70,283		70,283		23,296
2020
Total	17,725		17,725		33,735
2019
Total	38,372		38,372		16,205
Prior
Total	149,434		149,434		181,736
Revolving Loans Amortized Cost Basis
Total	1,012		1,012		947
Total
Total	294,367		294,367		306,381
Portfolio Segment and Loan Class | Real estate - commercial mortgage | Substandard or Lower
2023
Total	202		202		1,032
2022
Total	4,889		4,889		3,039
2021
Total	25,184		25,184		31,042
2020
Total	45,196		45,196		38,378
2019
Total	25,257		25,257		23,112
Prior
Total	81,489		81,489		87,168
Revolving Loans Amortized Cost Basis
Total	480		480		243
Total
Total	182,697		182,697		184,014
Portfolio Segment and Loan Class | Commercial and Industrial
2023
Total	462,010		462,010		919,629
Current period gross charge-offs			0		0
2022
Total	672,111		672,111		474,042
Current period gross charge-offs			0		0
2021
Total	439,052		439,052		406,462
Current period gross charge-offs			0		(36)
2020
Total	374,131		374,131		336,796
Current period gross charge-offs			0		0
2019
Total	315,524		315,524		193,395
Current period gross charge-offs			0		(21)
Prior
Total	752,310		752,310		651,010
Current period gross charge-offs			0		(365)
Revolving Loans Amortized Cost Basis
Total	1,576,499		1,576,499		1,495,086
Current period gross charge-offs			(502)		(1,192)
Total
Total	4,602,446		4,602,446		4,477,537
Current period gross charge-offs			(2,629)		(2,390)
Portfolio Segment and Loan Class | Commercial and Industrial | Pass
2023
Total	461,413		461,413		907,390
2022
Total	652,086		652,086		449,145
2021
Total	425,486		425,486		397,881
2020
Total	365,676		365,676		315,605
2019
Total	292,754		292,754		185,096
Prior
Total	706,510		706,510		604,352
Revolving Loans Amortized Cost Basis
Total	1,432,210		1,432,210		1,387,961
Total
Total	4,345,186		4,345,186		4,248,048
Portfolio Segment and Loan Class | Commercial and Industrial | Special Mention
2023
Total	392		392		11,405
2022
Total	16,804		16,804		24,479
2021
Total	11,786		11,786		3,763
2020
Total	5,392		5,392		8,147
2019
Total	3,522		3,522		5,218
Prior
Total	16,458		16,458		24,633
Revolving Loans Amortized Cost Basis
Total	60,230		60,230		56,048
Total
Total	115,332		115,332		133,943
Portfolio Segment and Loan Class | Commercial and Industrial | Substandard or Lower
2023
Total	205		205		834
2022
Total	3,221		3,221		418
2021
Total	1,780		1,780		4,818
2020
Total	3,063		3,063		13,044
2019
Total	19,248		19,248		3,081
Prior
Total	29,342		29,342		22,025
Revolving Loans Amortized Cost Basis
Total	84,059		84,059		51,077
Total
Total	141,928		141,928		95,546
Portfolio Segment and Loan Class | Real estate - construction(2)
2023
Total	103,193		103,193		159,195
Current period gross charge-offs			0		0
2022
Total	218,793		218,793		390,993
Current period gross charge-offs			0		0
2021
Total	433,186		433,186		247,258
Current period gross charge-offs			0		0
2020
Total	155,168		155,168		30,813
Current period gross charge-offs			0		0
2019
Total	21,017		21,017		24,421
Current period gross charge-offs			0		0
Prior
Total	122,953		122,953		119,386
Current period gross charge-offs			0		0
Revolving Loans Amortized Cost Basis
Total	19,888		19,888		47,474
Current period gross charge-offs			0		0
Total
Total	1,074,198		1,074,198		1,019,540
Current period gross charge-offs			0		0
Portfolio Segment and Loan Class | Real estate - construction(2) | Pass
2023
Total	103,193		103,193		159,195
2022
Total	218,294		218,294		390,993
2021
Total	432,924		432,924		243,406
2020
Total	127,131		127,131		28,539
2019
Total	18,815		18,815		24,421
Prior
Total	88,431		88,431		93,511
Revolving Loans Amortized Cost Basis
Total	17,480		17,480		47,271
Total
Total	1,006,268		1,006,268		987,336
Portfolio Segment and Loan Class | Real estate - construction(2) | Special Mention
2023
Total	0		0		0
2022
Total	26		26		0
2021
Total	262		262		0
2020
Total	28,037		28,037		0
2019
Total	0		0		0
Prior
Total	11,263		11,263		21,603
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	39,588		39,588		21,603
Portfolio Segment and Loan Class | Real estate - construction(2) | Substandard or Lower
2023
Total	0		0		0
2022
Total	473		473		0
2021
Total	0		0		3,852
2020
Total	0		0		2,274
2019
Total	2,202		2,202		0
Prior
Total	23,259		23,259		4,272
Revolving Loans Amortized Cost Basis
Total	2,408		2,408		203
Total
Total	28,342		28,342		10,601
Payment Activity, Aging Status
2023
Total	714,583		714,583		1,663,147
2022
Total	1,609,386		1,609,386		1,936,748
2021
Total	1,874,980		1,874,980		1,192,235
2020
Total	1,124,104		1,124,104		374,362
2019
Total	354,356		354,356		153,878
Prior
Total	999,279		999,279		889,588
Revolving Loans Amortized Cost Basis
Total	815,436		815,436		843,948
Total
Total	7,521,180		7,521,180		7,088,635
Payment Activity, Aging Status | Performing
2023
Total	714,523		714,523		1,661,656
2022
Total	1,608,325		1,608,325		1,931,346
2021
Total	1,869,784		1,869,784		1,185,464
2020
Total	1,119,036		1,119,036		367,860
2019
Total	349,051		349,051		149,193
Prior
Total	959,132		959,132		847,213
Revolving Loans Amortized Cost Basis
Total	814,043		814,043		842,226
Total
Total	7,460,639		7,460,639		7,019,019
Payment Activity, Aging Status | Nonperforming
2023
Total	60		60		1,491
2022
Total	1,061		1,061		5,402
2021
Total	5,196		5,196		6,771
2020
Total	5,068		5,068		6,502
2019
Total	5,305		5,305		4,685
Prior
Total	40,147		40,147		42,375
Revolving Loans Amortized Cost Basis
Total	1,393		1,393		1,722
Total
Total	60,541		60,541		69,616
Payment Activity, Aging Status | Real estate – residential mortgage
2023
Total	413,908		413,908		935,102
Current period gross charge-offs			0		0
2022
Total	1,031,351		1,031,351		1,713,807
Current period gross charge-offs			0		0
2021
Total	1,719,894		1,719,894		1,060,723
Current period gross charge-offs			0		0
2020
Total	1,025,076		1,025,076		292,633
Current period gross charge-offs			0		0
2019
Total	281,777		281,777		92,042
Current period gross charge-offs			0		0
Prior
Total	675,256		675,256		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	5,147,262		5,147,262		4,737,279
Current period gross charge-offs			(62)		(66)
Payment Activity, Aging Status | Real estate – residential mortgage | Performing
2023
Total	413,908		413,908		933,903
2022
Total	1,030,693		1,030,693		1,708,703
2021
Total	1,715,214		1,715,214		1,054,126
2020
Total	1,020,426		1,020,426		286,167
2019
Total	276,538		276,538		87,455
Prior
Total	651,744		651,744		620,416
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	5,108,523		5,108,523		4,690,770
Payment Activity, Aging Status | Real estate – residential mortgage | Nonperforming
2023
Total	0		0		1,199
2022
Total	658		658		5,104
2021
Total	4,680		4,680		6,597
2020
Total	4,650		4,650		6,466
2019
Total	5,239		5,239		4,587
Prior
Total	23,512		23,512		22,556
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	38,739		38,739		46,509
Payment Activity, Aging Status | Consumer and Home Equity
2023
Total	169,539		169,539		416,923
Current period gross charge-offs			0		0
2022
Total	310,016		310,016		110,022
Current period gross charge-offs			0		(587)
2021
Total	95,291		95,291		80,596
Current period gross charge-offs			0		(70)
2020
Total	66,444		66,444		52,420
Current period gross charge-offs			0		(108)
2019
Total	49,908		49,908		45,740
Current period gross charge-offs			0		(16)
Prior
Total	289,731		289,731		217,639
Current period gross charge-offs			(374)		(442)
Revolving Loans Amortized Cost Basis
Total	815,436		815,436		843,948
Current period gross charge-offs			0		(178)
Total
Total	1,825,421		1,825,421		1,802,017
Current period gross charge-offs			(3,519)		(4,412)
Payment Activity, Aging Status | Consumer and Home Equity | Performing
2023
Total	169,479		169,479		416,631
2022
Total	309,613		309,613		109,724
2021
Total	94,775		94,775		80,422
2020
Total	66,026		66,026		52,384
2019
Total	49,842		49,842		45,642
Prior
Total	284,430		284,430		211,127
Revolving Loans Amortized Cost Basis
Total	814,043		814,043		842,226
Total
Total	1,814,953		1,814,953		1,792,217
Payment Activity, Aging Status | Consumer and Home Equity | Nonperforming
2023
Total	60		60		292
2022
Total	403		403		298
2021
Total	516		516		174
2020
Total	418		418		36
2019
Total	66		66		98
Prior
Total	5,301		5,301		6,512
Revolving Loans Amortized Cost Basis
Total	1,393		1,393		1,722
Total
Total	10,468		10,468		9,800
Payment Activity, Aging Status | Leases and other loans
2023
Total	99,355		99,355		146,198
Current period gross charge-offs			(214)		(506)
2022
Total	94,583		94,583		39,427
Current period gross charge-offs			(401)		(167)
2021
Total	33,981		33,981		40,024
Current period gross charge-offs			(133)		(140)
2020
Total	29,249		29,249		29,309
Current period gross charge-offs			(72)		(80)
2019
Total	22,671		22,671		15,019
Current period gross charge-offs			(52)		(47)
Prior
Total	34,292		34,292		28,977
Current period gross charge-offs			(417)		(1,191)
Revolving Loans Amortized Cost Basis
Total	0		0		0
Current period gross charge-offs			0		0
Total
Total	314,131		314,131		298,954
Current period gross charge-offs			(1,888)		(2,131)
Payment Activity, Aging Status | Leases and other loans | Performing
2023
Total	99,355		99,355		146,198
2022
Total	94,583		94,583		39,427
2021
Total	33,981		33,981		40,024
2020
Total	29,249		29,249		29,309
2019
Total	22,671		22,671		15,019
Prior
Total	22,958		22,958		15,670
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	302,797		302,797		285,647
Payment Activity, Aging Status | Leases and other loans | 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	11,334		11,334		13,307
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	11,334		11,334		13,307
Payment Activity, Aging Status | Construction - other
2023
Total	31,781		31,781		164,924
Current period gross charge-offs			0		0
2022
Total	173,436		173,436		73,492
Current period gross charge-offs			0		0
2021
Total	25,814		25,814		10,892
Current period gross charge-offs			0		0
2020
Total	3,335		3,335		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	234,366		234,366		250,385
Current period gross charge-offs			0		0
Payment Activity, Aging Status | Construction - other | Performing
2023
Total	31,781		31,781		164,924
2022
Total	173,436		173,436		73,492
2021
Total	25,814		25,814		10,892
2020
Total	3,335		3,335		0
2019
Total	0		0		1,077
Prior
Total	0		0		0
Revolving Loans Amortized Cost Basis
Total	0		0		0
Total
Total	234,366		234,366		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
Conversion to Term Loan | Portfolio Segment and Loan Class
Revolving Loans Amortized Cost Basis
Total	14,721		14,721		1,424
Conversion to Term Loan | Portfolio Segment and Loan Class | Pass
Revolving Loans Amortized Cost Basis
Total	12,963		12,963		925
Conversion to Term Loan | Portfolio Segment and Loan Class | Special Mention
Revolving Loans Amortized Cost Basis
Total	748		748		250
Conversion to Term Loan | Portfolio Segment and Loan Class | Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	1,010		1,010		249
Conversion to Term Loan | Portfolio Segment and Loan Class | Real estate - commercial mortgage
Revolving Loans Amortized Cost Basis
Total	3,912		3,912		307
Current period gross charge-offs			(13,562)		(12,420)
Conversion to Term Loan | Portfolio Segment and Loan Class | Real estate - commercial mortgage | Pass
Revolving Loans Amortized Cost Basis
Total	3,912		3,912		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	10,809		10,809		1,117
Current period gross charge-offs			(2,127)		(776)
Conversion to Term Loan | Portfolio Segment and Loan Class | Commercial and Industrial | Pass
Revolving Loans Amortized Cost Basis
Total	9,051		9,051		618
Conversion to Term Loan | Portfolio Segment and Loan Class | Commercial and Industrial | Special Mention
Revolving Loans Amortized Cost Basis
Total	748		748		250
Conversion to Term Loan | Portfolio Segment and Loan Class | Commercial and Industrial | Substandard or Lower
Revolving Loans Amortized Cost Basis
Total	1,010		1,010		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	29,056		29,056		34,729
Conversion to Term Loan | Payment Activity, Aging Status | Performing
Revolving Loans Amortized Cost Basis
Total	26,745		26,745		34,061
Conversion to Term Loan | Payment Activity, Aging Status | Nonperforming
Revolving Loans Amortized Cost Basis
Total	2,311		2,311		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	29,056		29,056		34,729
Current period gross charge-offs			(3,145)		(3,011)
Conversion to Term Loan | Payment Activity, Aging Status | Consumer and Home Equity | Performing
Revolving Loans Amortized Cost Basis
Total	26,745		26,745		34,061
Conversion to Term Loan | Payment Activity, Aging Status | Consumer and Home Equity | Nonperforming
Revolving Loans Amortized Cost Basis
Total	2,311		2,311		668
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			(599)		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
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