Loans, Allowance for Credit Losses and Credit Quality Financing Receivable Past Due (Details) $ in Thousands		Mar. 31, 2022 USD ($) loan		Dec. 31, 2021 USD ($) loan	Mar. 31, 2021 USD ($)
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		428		518
Financing Receivable, 90 Days or More Past Due, Still Accruing		$ 0		$ 0
Loans and Leases Receivable, Gross		$ 13,580,027	[1]	$ 13,587,286	$ 9,246,691
Number Of Financing Receivables Total Past Due | loan		574		701
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		38		60
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		108		123
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 13,748		$ 37,927
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		13,086		1,677
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		12,402		7,092
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		13,540,791		13,540,590
Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 39,236		$ 46,696
Commercial And Industrial [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		4		7
Financing Receivable, 90 Days or More Past Due, Still Accruing		$ 0		$ 0
Loans and Leases Receivable, Gross		$ 1,566,192	[1]	$ 1,563,279	2,086,671	[1]
Number Of Financing Receivables Total Past Due | loan		8		11
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		4		2
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		0		2
Financing Receivable, before Allowance for Credit Loss		$ 1,566,192		$ 1,563,279
Commercial And Industrial [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		276		143
Commercial And Industrial [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		3,399		252
Commercial And Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		0		24
Commercial And Industrial [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		1,562,517		1,562,860
Commercial And Industrial [Member] | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 3,675		$ 419
Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		10		15
Financing Receivable, 90 Days or More Past Due, Still Accruing		$ 0		$ 0
Loans and Leases Receivable, Gross		$ 7,897,616	[1]	$ 7,992,344	4,177,617	[1]
Number Of Financing Receivables Total Past Due | loan		15		19
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		3		0
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		2		4
Financing Receivable, before Allowance for Credit Loss		$ 7,897,616		$ 7,992,344
Commercial Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		6,530		32,845
Commercial Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		7,897		0
Commercial Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		7,009		1,339
Commercial Real Estate [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		7,876,180		7,958,160
Commercial Real Estate [Member] | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 21,436		$ 34,184
Construction Loans [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		3		0
Financing Receivable, 90 Days or More Past Due, Still Accruing		$ 0		$ 0
Loans and Leases Receivable, Gross		$ 1,153,945	[1]	$ 1,165,457	516,362	[1]
Number Of Financing Receivables Total Past Due | loan		3		0
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		0		0
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		0		0
Financing Receivable, before Allowance for Credit Loss		$ 1,153,945		$ 1,165,457
Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		2,592		0
Construction Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		0		0
Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		0		0
Construction Loans [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		1,151,353		1,165,457
Construction Loans [Member] | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 2,592		$ 0
Small Business [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		7		11
Financing Receivable, 90 Days or More Past Due, Still Accruing		$ 0		$ 0
Loans and Leases Receivable, Gross		$ 200,405	[1]	$ 193,189	174,211	[1]
Number Of Financing Receivables Total Past Due | loan		11		21
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		2		6
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		2		4
Financing Receivable, before Allowance for Credit Loss		$ 200,405		$ 193,189
Small Business [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		85		136
Small Business [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		6		53
Small Business [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		8		24
Small Business [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		200,306		192,976
Small Business [Member] | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 99		$ 213
Residential Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		9		12
Financing Receivable, 90 Days or More Past Due, Still Accruing		$ 0		$ 0
Loans and Leases Receivable, Gross		$ 1,706,045	[1]	$ 1,604,686	$ 1,241,789	[1]
Number Of Financing Receivables Total Past Due | loan		88		93
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		6		5
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		73		76
Financing Receivable, before Allowance for Credit Loss		$ 1,706,045		$ 1,604,686
Residential Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		2,890		2,709
Residential Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		1,546		714
Residential Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		3,341		3,922
Residential Real Estate [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		1,698,268		1,597,341
Residential Real Estate [Member] | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 7,777		$ 7,345
Home Equity Line of Credit [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		11		15
Financing Receivable, 90 Days or More Past Due, Still Accruing		$ 0		$ 0
Loans and Leases Receivable, Gross		$ 1,025,815		$ 1,039,611
Number Of Financing Receivables Total Past Due | loan		39		42
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		5		6
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		23		21
Home Equity Line of Credit [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 834		$ 1,375
Home Equity Line of Credit [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		81		381
Home Equity Line of Credit [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		2,026		1,671
Home Equity Line of Credit [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		1,022,874		1,036,184
Home Equity Line of Credit [Member] | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 2,941		$ 3,427
Consumer - Other [Member]
Financing Receivable, Past Due [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	[2]	384		458
Financing Receivable, 90 Days or More Past Due, Still Accruing	[2]	$ 0		$ 0
Loans and Leases Receivable, Gross	[2]	$ 30,009		$ 28,720
Number Of Financing Receivables Total Past Due | loan	[2]	410		515
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	[2]	18		41
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	[2]	8		16
Financing Receivable, before Allowance for Credit Loss		$ 30,009		$ 28,720
Consumer - Other [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	[2]	541		719
Consumer - Other [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	[2]	157		277
Consumer - Other [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	[2]	18		112
Consumer - Other [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	[2]	29,293		27,612
Consumer - Other [Member] | Financial Asset, Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	[2]	$ 716		$ 1,108

[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] Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.