Loans, Allowance for Credit Losses and Credit Quality - Finance Receivable, Nonaccrual (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance	[1]	$ 30,861		$ 82,660
Financing Receivable, Nonaccrual, No Allowance	[2]	58,632		18,869
Financing Receivable, Nonaccrual	[1]	89,493		101,529
Accounts Receivable, Noncurrent, Accrued Interest, Writeoff		344	$ 385
Commercial And Industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		9,683		2,500
Financing Receivable, Nonaccrual, No Allowance	[2]	0		11,652
Financing Receivable, Nonaccrual		9,683		14,152
Commercial Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		7,208		67,126
Financing Receivable, Nonaccrual, No Allowance	[2]	58,632		7,217
Financing Receivable, Nonaccrual		65,840		74,343
Small Business [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		156		302
Financing Receivable, Nonaccrual, No Allowance	[2]	0		0
Financing Receivable, Nonaccrual		156		302
Residential Real Estate [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		10,966		10,243
Financing Receivable, Nonaccrual, No Allowance	[2]	0		0
Financing Receivable, Nonaccrual		10,966		10,243
Home Equity Loan [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		2,840		2,479
Financing Receivable, Nonaccrual, No Allowance	[2]	0		0
Financing Receivable, Nonaccrual		2,840		2,479
Consumer - Other [Member]
Financing Receivable, Nonaccrual [Line Items]
Finance Receivable, Nonaccrual, with allowance		8		10
Financing Receivable, Nonaccrual, No Allowance	[2]	0		0
Financing Receivable, Nonaccrual		$ 8		$ 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.