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Loans, Allowance for Credit Losses and Credit Quality Finance Receivable, Nonaccrual (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance |  | $ 55,369 |
Financing Receivable, Nonaccrual, No Allowance |  | 42,655 |
Tdrs Recorded Investment On Nonaccrual Status |  | 23,810 | $ 24,766
Financing Receivable, Nonaccrual | [1] | 98,024 | 45,892
Commercial And Industrial [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance |  | 17,816 |
Financing Receivable, Nonaccrual, No Allowance |  | 19,035 |
Financing Receivable, Nonaccrual |  | 36,851 | 22,574
Commercial Real Estate [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance |  | 17,501 |
Financing Receivable, Nonaccrual, No Allowance |  | 20,663 |
Financing Receivable, Nonaccrual |  | 38,164 | 3,016
Small Business [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance |  | 542 |
Financing Receivable, Nonaccrual |  | 542 | 311
Residential Real Estate [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance |  | 13,379 |
Financing Receivable, Nonaccrual, No Allowance |  | 2,850 |
Financing Receivable, Nonaccrual |  | 16,229 | 13,360
Home Equity Line of Credit [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance |  | 6,052 |
Financing Receivable, Nonaccrual, No Allowance |  | 107 |
Financing Receivable, Nonaccrual |  | 6,159 | 6,570
Consumer - Other [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance |  | 79 |
Financing Receivable, Nonaccrual |  | $ 79 | $ 61
[1] | Included in these amounts were $23.8 million and $24.8 million of nonaccruing TDRs at September 30, 2020 and December 31, 2019, respectively.

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