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Loans, Allowance for Credit Losses and Credit Quality Textual (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
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 | (5.20%) |  |
Provision for credit losses | $ (2,500,000) | $ 25,000,000 |
Interest Receivable | 33,400,000 | 25,900,000 |
Off-Balance Sheet, Credit Loss, Liability | 1,000,000.0 |  | $ 1,200,000
Loans with active Deferrals | 220,600,000 |  | 173,600,000
Allowance for Loan and Lease Losses, Write-offs | (3,686,000) |  |
Financing Receivable, Troubled Debt Restructuring, Increase (Decrease) from Modification |  | 1,106,000 |
us-gaap_FinancingReceivableTroubledDebtRestructuringIncreaseDecreaseFromModification | 14,300,000 | 872,000,000 |
Loans with active Deferrals | 220,600,000 |  | 173,600,000
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  | (1,137,000) |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase | 1,200,000 | 1,157,000 |
Interest Receivable | 33,400,000 | 25,900,000 |
Loans and Leases Receivable, Allowance | (107,549,000) | (92,376,000) | (113,392,000)
Off-Balance Sheet, Credit Loss, Liability | 1,000,000.0 |  | 1,200,000
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) | 5,800,000 |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | 0 | 0 |
US Government Insured Loan Program [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | 340,000,000.0 |  | 506,300,000
Commercial And Industrial [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Provision for credit losses |  | 5,948,000 |
Financing Receivable, before Allowance for Credit Loss | 2,086,671,000 |  | $ 2,103,152,000
Allowance for Loan and Lease Losses, Write-offs | (3,331,000) |  |
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  | (1,984,000) |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase |  | 49,000 |
Loans and Leases Receivable, Allowance |  | $ (21,649,000) |
Loans Insured or Guaranteed by US Government Authorities |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 846,300,000 |  |

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- Definition Amount of increase in allowance for credit loss on financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition The effect of a change in method or methods for calculating the allowance for credit losses on the current period provision. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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