Loans, Allowance for Credit Losses and Credit Quality - Finance Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023		Jun. 30, 2023		Dec. 31, 2022	Jun. 30, 2022
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		$ 1,254,060		$ 1,254,060			$ 1,636,427
2020		2,719,387		2,719,387			2,683,269
2019		2,350,389		2,350,389			2,070,742
2018		1,776,962		1,776,962			1,182,288
2017		916,206		916,206			1,137,251
Prior		3,336,946		3,336,946			3,220,493
Revolving Loans		1,782,674		1,782,674			1,739,638
Revolving converted to Term		3,287		3,287			5,656
Total loans		14,139,911	[1]	14,139,911	[1]	$ 13,928,675
Total loans		14,139,911		14,139,911		13,928,675	13,675,764
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023				1,003
2022				0
2021				0
2020				0
2019				0
Prior				41
Revolving Loans				23,538
Revolving converted to Term				0
Total		23,767		24,582
Commercial And Industrial [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		255,703		255,703			221,010
2020		214,342		214,342			190,312
2019		119,210		119,210			137,385
2018		99,895		99,895			80,615
2017		51,056		51,056			99,089
Prior		121,787		121,787			29,983
Revolving Loans		861,226		861,226			782,652
Revolving converted to Term		0		0			0
Total loans		1,723,219	[1]	1,723,219	[1]	1,635,103
Total loans		1,723,219		1,723,219		1,635,103	1,541,046	[1]
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023				0
2022				0
2021				0
2020				0
2019				0
Prior				34
Revolving Loans				23,437
Revolving converted to Term				0
Total		23,190		23,471
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021	[2]	255,397		255,397			220,435
2020	[2]	206,214		206,214			188,007
2019	[2]	117,268		117,268			136,331
2018	[2]	98,942		98,942			79,699
2017	[2]	49,317		49,317			98,598
Prior	[2]	120,734		120,734			26,321
Revolving Loans	[2]	819,928		819,928			751,261
Revolving converted to Term	[2]	0		0			0
Total loans	[1],[2]	1,667,800		1,667,800
Total loans	[1],[2]						1,500,652
Commercial And Industrial [Member] | Potential Weakness [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		136		136			221
2020		1,331		1,331			1,022
2019		660		660			1,054
2018		805		805			872
2017		653		653			84
Prior		666		666			1,017
Revolving Loans		27,334		27,334			4,229
Revolving converted to Term		0		0			0
Total loans	[1]	31,585		31,585
Total loans	[1]						8,499
Commercial And Industrial [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		170		170			354
2020		6,797		6,797			1,283
2019		1,282		1,282
2018		148		148			44
2017		1,086		1,086			407
Prior		387		387			2,645
Revolving Loans		13,964		13,964			27,162
Revolving converted to Term		0		0			0
Total loans	[1]	23,834		23,834
Total loans	[1]						31,895
Commercial And Industrial [Member] | Partial Loss Probable [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0		0			0
2020		0		0			0
2019		0		0			0
2018		0		0			0
2017		0		0			0
Prior		0		0			0
Revolving Loans		0		0			0
Revolving converted to Term		0		0			0
Total loans	[1]	0		0
Total loans	[1]						0
Commercial And Industrial [Member] | Definite Loss [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0		0			0
2020		0		0			0
2019		0		0			0
2018		0		0			0
2017		0		0			0
Prior		0		0			0
Revolving Loans		0		0			0
Revolving converted to Term		0		0			0
Total loans	[1]	0		0
Total loans	[1]						0
Commercial Real Estate [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		571,770		571,770			584,224
2020		1,250,448		1,250,448			1,559,617
2019		1,470,500		1,470,500			1,363,741
2018		1,353,762		1,353,762			882,926
2017		679,243		679,243			864,701
Prior		2,419,604		2,419,604			2,387,951
Revolving Loans		66,612		66,612			145,503
Revolving converted to Term		857		857			3,094
Total loans		7,812,796	[1]	7,812,796	[1]	7,760,230
Total loans		7,812,796		7,812,796		7,760,230	7,791,757	[1]
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023				0
2022				0
2021				0
2020				0
2019				0
Prior				0
Revolving Loans				0
Revolving converted to Term				0
Total		0		0
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		508,627		508,627			543,108
2020		1,189,436		1,189,436			1,488,142
2019		1,384,305		1,384,305			1,306,131
2018		1,318,126		1,318,126			874,026
2017		662,064		662,064			781,208
Prior		2,264,182		2,264,182			2,122,989
Revolving Loans		66,612		66,612			131,883
Revolving converted to Term		857		857			516
Total loans	[1]	7,394,209		7,394,209
Total loans	[1]						7,248,003
Commercial Real Estate [Member] | Potential Weakness [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		62,601		62,601			40,003
2020		22,115		22,115			63,294
2019		72,507		72,507			53,347
2018		15,215		15,215			5,996
2017		3,268		3,268			68,671
Prior		131,636		131,636			197,553
Revolving Loans		0		0			13,620
Revolving converted to Term		0		0			2,578
Total loans	[1]	307,342		307,342
Total loans	[1]						445,062
Commercial Real Estate [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		542		542			1,113
2020		24,678		24,678			8,181
2019		13,688		13,688			4,263
2018		20,421		20,421			2,904
2017		13,911		13,911			14,822
Prior		23,786		23,786			67,409
Revolving Loans		0		0			0
Revolving converted to Term		0		0			0
Total loans	[1]	97,026		97,026
Total loans	[1]						98,692
Commercial Real Estate [Member] | Partial Loss Probable [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0		0			0
2020		14,219		14,219			0
2019		0		0			0
2018		0		0			0
2017		0		0			0
Prior		0		0			0
Revolving Loans		0		0			0
Revolving converted to Term		0		0			0
Total loans	[1]	14,219		14,219
Total loans	[1]						0
Commercial Real Estate [Member] | Definite Loss [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0		0			0
2020		0		0			0
2019		0		0			0
2018		0		0			0
2017		0		0			0
Prior		0		0			0
Revolving Loans		0		0			0
Revolving converted to Term		0		0			0
Total loans	[1]	0		0
Total loans	[1]						0
Construction Loans [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		138,267		138,267			375,598
2020		506,185		506,185			386,152
2019		247,726		247,726			272,900
2018		52,659		52,659			65,520
2017		48,062		48,062			28,097
Prior		4,749		4,749			32,724
Revolving Loans		25,148		25,148			33,583
Revolving converted to Term							3
Total loans		1,022,796	[1]	1,022,796	[1]	1,154,413
Total loans		1,022,796		1,022,796		1,154,413	1,194,577	[1]
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023				0
2022				0
2021				0
2020				0
2019				0
Prior				0
Revolving Loans				0
Revolving converted to Term				0
Total		0		0
Construction Loans [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		112,698		112,698			362,544
2020		489,700		489,700			369,399
2019		247,726		247,726			269,581
2018		48,793		48,793			65,520
2017		48,062		48,062			28,097
Prior		4,749		4,749			11,420
Revolving Loans		25,148		25,148			33,583
Revolving converted to Term		0		0			3
Total loans	[1]	976,876		976,876
Total loans	[1]						1,140,147
Construction Loans [Member] | Potential Weakness [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		16,910		16,910			13,054
2020		5,023		5,023
2019		0		0			3,319
2018		3,866		3,866			0
2017		0		0			0
Prior		0		0			21,304
Revolving Loans		0		0			0
Revolving converted to Term		0		0			0
Total loans	[1]	25,799		25,799
Total loans	[1]						37,677
Construction Loans [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		8,659		8,659			0
2020		11,462		11,462			16,753
2019		0		0			0
2018		0		0			0
2017		0		0			0
Prior		0		0			0
Revolving Loans		0		0			0
Revolving converted to Term		0		0			0
Total loans	[1]	20,121		20,121
Total loans	[1]						16,753
Construction Loans [Member] | Partial Loss Probable [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0		0			0
2020		0		0			0
2019		0		0			0
2018		0		0			0
2017		0		0			0
Prior		0		0			0
Revolving Loans		0		0			0
Revolving converted to Term		0		0			0
Total loans	[1]	0		0
Total loans	[1]						0
Construction Loans [Member] | Definite Loss [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0		0			0
2020		0		0			0
2019		0		0			0
2018		0		0			0
2017		0		0			0
Prior		0		0			0
Revolving Loans		0		0			0
Revolving converted to Term		0		0			0
Total loans	[1]	0		0
Total loans	[1]						0
Small Business [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		26,649		26,649			30,168
2020		54,133		54,133			49,013
2019		41,998		41,998			34,876
2018		28,679		28,679			18,914
2017		14,902		14,902			11,198
Prior		25,508		25,508			22,852
Revolving Loans		45,223		45,223			38,932
Revolving converted to Term		0		0			0
Total loans		237,092	[1]	237,092	[1]	219,102
Total loans		237,092		237,092		219,102	205,953	[1]
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023				0
2022				0
2021				0
2020				0
2019				0
Prior				0
Revolving Loans				87
Revolving converted to Term				0
Total		59		87
Small Business [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		26,279		26,279			30,065
2020		53,998		53,998			48,840
2019		41,861		41,861			33,910
2018		28,187		28,187			18,528
2017		14,902		14,902			10,999
Prior		24,741		24,741			22,481
Revolving Loans		43,853		43,853			37,755
Revolving converted to Term		0		0			0
Total loans	[1]	233,821		233,821
Total loans	[1]						202,578
Small Business [Member] | Potential Weakness [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0		0			0
2020		0		0			173
2019							415
2018		157		157			373
2017							195
Prior		216		216			141
Revolving Loans		305		305			707
Revolving converted to Term		0		0			0
Total loans	[1]	678		678
Total loans	[1]						2,004
Small Business [Member] | Definite Weakness Loss Unlikely [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		370		370			103
2020		135		135
2019		137		137			551
2018		335		335			13
2017							4
Prior		551		551			230
Revolving Loans		1,065		1,065			470
Revolving converted to Term		0		0			0
Total loans	[1]	2,593		2,593
Total loans	[1]						1,371
Small Business [Member] | Partial Loss Probable [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0		0			0
2020		0		0			0
2019		0		0			0
2018		0		0			0
2017		0		0			0
Prior		0		0			0
Revolving Loans		0		0			0
Revolving converted to Term		0		0			0
Total loans	[1]	0		0
Total loans	[1]						0
Small Business [Member] | Definite Loss [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0		0			0
2020		0		0			0
2019		0		0			0
2018		0		0			0
2017		0		0			0
Prior		0		0			0
Revolving Loans		0		0			0
Revolving converted to Term		0		0			0
Total loans	[1]	0		0
Total loans	[1]						0
Residential Real Estate [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		246,831		246,831			396,321
2020		652,380		652,380			432,105
2019		411,534		411,534			201,035
2018		188,875		188,875			99,019
2017		91,726		91,726			103,445
Prior		629,938		629,938			612,132
Revolving Loans		0		0			0
Revolving converted to Term		0		0			0
Total loans		2,221,284	[1]	2,221,284	[1]	2,035,524
Total loans		2,221,284		2,221,284		2,035,524	1,844,057	[1]
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023				0
2022				0
2021				0
2020				0
2019				0
Prior				0
Revolving Loans				0
Revolving converted to Term				0
Total		0		0
Residential Real Estate [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		246,831		246,831			396,321
2020		652,380		652,380			432,105
2019		411,534		411,534			200,912
2018		188,281		188,281			99,019
2017		91,726		91,726			102,471
Prior		627,591		627,591			610,183
Revolving Loans		0		0			0
Revolving converted to Term		0		0			0
Total loans	[1]	2,218,343		2,218,343
Total loans	[1]						1,841,011
Residential Real Estate [Member] | Default [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0		0			0
2020		0		0			0
2019		0		0			123
2018		594		594
2017		0		0			974
Prior		2,347		2,347			1,949
Revolving Loans		0		0			0
Revolving converted to Term		0		0			0
Total loans	[1]	2,941		2,941
Total loans	[1]						3,046
Home Equity Loan [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		14,533		14,533			28,727
2020		41,442		41,442			63,208
2019		57,879		57,879			58,488
2018		52,017		52,017			33,623
2017		30,658		30,658			30,145
Prior		132,915		132,915			130,489
Revolving Loans		763,524		763,524			718,271
Revolving converted to Term		2,430		2,430			2,559
Total loans	[1]	1,095,398		1,095,398
Total loans		1,095,398		1,095,398		$ 1,088,750	1,065,510	[1]
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023				0
2022				0
2021				0
2020				0
2019				0
Prior				0
Revolving Loans				0
Revolving converted to Term				0
Total		0		0
Home Equity Loan [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		14,533		14,533			28,727
2020		41,442		41,442			63,208
2019		57,879		57,879			58,488
2018		52,017		52,017			33,501
2017		30,658		30,658			30,145
Prior		132,915		132,915			130,197
Revolving Loans		762,582		762,582			717,115
Revolving converted to Term		2,288		2,288			2,559
Total loans	[1]	1,094,314		1,094,314
Total loans	[1]						1,063,940
Home Equity Loan [Member] | Default [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0		0			0
2020		0		0			0
2019		0		0			0
2018		0		0			122
2017		0		0			0
Prior							292
Revolving Loans		942		942			1,156
Revolving converted to Term		142		142			0
Total loans	[1]	1,084		1,084
Total loans	[1]						1,570
Consumer Loan [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		307		307			379
2020		457		457			2,862
2019		1,542		1,542			2,317
2018		1,075		1,075			1,671
2017		559		559			576
Prior		2,445		2,445			4,362
Revolving Loans		20,941		20,941			20,697
Revolving converted to Term		0		0			0
Total loans	[1]	27,326		27,326
Total loans	[1]						32,864
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023				1,003
2022				0
2021				0
2020				0
2019				0
Prior				7
Revolving Loans				14
Revolving converted to Term				0
Total				1,024
Consumer Loan [Member] | Pass [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		307		307			379
2020		457		457			2,862
2019		1,542		1,542			2,317
2018		1,075		1,075			1,671
2017		559		559			576
Prior		2,445		2,445			4,350
Revolving Loans		20,940		20,940			20,697
Revolving converted to Term		0		0			0
Total loans	[1]	27,325		27,325
Total loans	[1]						32,852
Consumer Loan [Member] | Default [Member]
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
2021		0		0			0
2020		0		0			0
2019		0		0			0
2018		0		0			0
2017		0		0			0
Prior		0		0			12
Revolving Loans		1		1			0
Revolving converted to Term		0		0			0
Total loans	[1]	1		1
Total loans	[1]						12
Loans Insured or Guaranteed by US Government Authorities
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]
Total loans		$ 5,700		$ 5,700			$ 30,600

[1] Loan origination dates in the tables above reflect the original origination date, or the date of a material modification of a previously originated loan.

[2] Loans originated as part of the Paycheck Protection Program ("PPP") established by the Coronavirus Aid, Relief and Economic Security Act (the "CARES Act") are included within commercial and industrial under the 2021 and 2020 vintage year and "pass" category as these loans are 100% guaranteed by the U.S. Government. Outstanding PPP loans totaled $5.7 million and $30.6 million as of June 30, 2023 and 2022, respectively. (3)Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances and the associated gross write-offs.