Loans, Allowance for Credit Losses and Credit Quality - Finance Receivable, Nonaccrual (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance	[1]	$ 32,392		$ 32,392		$ 82,660
Financing Receivable, Nonaccrual, No Allowance	[2]	23,825		23,825		18,869
Financing Receivable, Nonaccrual	[1]	56,217		56,217		101,529
Accounts Receivable, Noncurrent, Accrued Interest, Writeoff		224	$ 112	568	$ 497
Commercial And Industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		13,544		13,544		2,500
Financing Receivable, Nonaccrual, No Allowance	[2]	0		0		11,652
Financing Receivable, Nonaccrual		13,544		13,544		14,152
Commercial Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		4,892		4,892		67,126
Financing Receivable, Nonaccrual, No Allowance	[2]	23,825		23,825		7,217
Financing Receivable, Nonaccrual		28,717		28,717		74,343
Small Business [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		173		173		302
Financing Receivable, Nonaccrual, No Allowance	[2]	0		0		0
Financing Receivable, Nonaccrual		173		173		302
Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		10,013		10,013		10,243
Financing Receivable, Nonaccrual, No Allowance	[2]	0		0		0
Financing Receivable, Nonaccrual		10,013		10,013		10,243
Home Equity Loan [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		3,765		3,765		2,479
Financing Receivable, Nonaccrual, No Allowance	[2]	0		0		0
Financing Receivable, Nonaccrual		3,765		3,765		2,479
Consumer - Other [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		5		5		10
Financing Receivable, Nonaccrual, No Allowance	[2]	0		0		0
Financing Receivable, Nonaccrual		$ 5		$ 5		$ 10

[1] (1)Nonaccrual balances reported above without an allowance for credit losses are attributable to loans evaluated on an individual basis where it was determined that there was no risk of loss due to sufficient underlying collateral values.

[2] Nonaccrual balances reported above without an allowance for credit losses are attributable to loans evaluated on an individual basis where it was determined that there was no risk of loss due to sufficient underlying collateral values.