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Loans, Allowance for Credit Losses and Credit Quality Textual (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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 | 3.10% |  |  |  | 70.60% |  |  |  |
Provision for credit losses | $ 7,500,000 | $ 20,000,000.0 | $ 25,000,000.0 | $ 0 | $ 52,500,000 | $ 2,000,000 |  |  |
Loans with active Deferrals | 583,800,000 |  |  |  | 583,800,000 |  |  |  |
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 |  |  |  |  | 1,157,000 |  |  |  |
Interest Receivable | 36,700,000 |  |  |  | 36,700,000 |  |  |  |
Loans and Leases Receivable, Allowance | (115,625,000) |  |  | (66,942,000) | (115,625,000) | (66,942,000) | $ (67,740,000) | $ (65,960,000) | $ (64,293,000)
Off-Balance Sheet, Credit Loss, Liability | 1,000,000.0 |  |  |  | 1,000,000.0 |  |  |  |
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) | (3,400,000) |  |  |  | (47,900,000) |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | 0 |  |  | 0 | 0 | 0 |  |  |
US Government Insured Loan Program [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 811,700,000 |  |  |  | 811,700,000 |  |  |  |
Commercial And Industrial [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |  |
Provision for credit losses |  |  |  | $ (528,000) |  | $ 445,000 |  |  |
Financing Receivable, before Allowance for Credit Loss | 2,062,345,000 |  |  |  | 2,062,345,000 |  | $ 1,395,036,000 |  |
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 | $ (17,332,000) |  |  |  | $ (17,332,000) |  |  | $ (16,857,000) | $ (15,760,000)

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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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