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Loans, Allowance for Credit Losses and Credit Quality Textual (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Days To Be Termed As Non Accrual Loans |  |  |  |  |  | 90 days |  |  |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) by percentage |  |  |  |  |  | (1.80%) |  |  |  |
Release of provision for credit losses |  | $ 0 |  | $ (5,000,000) |  | $ (2,000,000) |  | $ (7,500,000) |  |
Interest Receivable |  | 39,000,000 |  | 29,900,000 |  | 39,000,000 |  | 29,900,000 |  |
Off-Balance Sheet, Credit Loss, Liability |  | 1,300,000 |  |  |  | 1,300,000 |  |  |  | $ 1,500,000
Loans with active Deferrals |  | 197,400,000 |  |  |  | 197,400,000 |  |  |  | 383,100,000
Allowance for Loan and Lease Losses, Write-offs |  | (544,000) |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification |  |  |  |  |  |  |  | 18,301,000 |  |
us-gaap_FinancingReceivableTroubledDebtRestructuringIncreaseDecreaseFromModification |  | 14,300,000 |  |  |  |  |  |  |  |
Financing Receivable, after Allowance for Credit Loss |  | 1,636,427,000 |  | 1,443,866,000 |  | 1,636,427,000 |  | 1,443,866,000 |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default |  | 0 |  |  |  |  |  | 0 |  |
Loans with active Deferrals |  | 197,400,000 |  |  |  | 197,400,000 |  |  |  | 383,100,000
Interest Receivable |  | 39,000,000 |  | 29,900,000 |  | 39,000,000 |  | 29,900,000 |  |
Loans and Leases Receivable, Allowance |  | (144,319,000) | [1] | (102,357,000) | [1] | (144,319,000) | [1] | (102,357,000) | [1] | (146,922,000)
Off-Balance Sheet, Credit Loss, Liability |  | 1,300,000 |  |  |  | 1,300,000 |  |  |  | 1,500,000
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) |  |  |  |  |  | 2,600,000 |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default |  | 0 |  |  |  |  |  | 0 |  |
Commercial And Industrial [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Release of provision for credit losses |  |  |  | (3,068,000) |  | (337,000) |  | (680,000) |  |
Financing Receivable, before Allowance for Credit Loss |  | 1,541,046,000 |  |  |  | 1,541,046,000 |  |  |  | $ 1,563,279,000
Allowance for Loan and Lease Losses, Write-offs |  | 0 |  |  |  |  |  |  |  |
Financing Receivable, after Allowance for Credit Loss |  | 221,010,000 |  | 575,392,000 |  | 221,010,000 |  | 575,392,000 |  |
Loans and Leases Receivable, Allowance | [1] | (14,107,000) |  | (17,032,000) |  | (14,107,000) |  | (17,032,000) |  |
Commercial And Industrial [Member] | Definite Weakness Loss Unlikely [Member] |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Financing Receivable, after Allowance for Credit Loss |  | 354,000 |  | $ 18,026,000 |  | 354,000 |  | $ 18,026,000 |  |
Loans Insured or Guaranteed by US Government Authorities |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 30,600,000 |  |  |  | $ 30,600,000 |  |  |  |
[1] | Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $39.0 million and $29.9 million as of June 30, 2022 and June 30, 2021, respectively.

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