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Loans, Allowance for Credit Losses and Credit Quality Finance Receivable, Nonaccrual (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance | $ 28,499 |  | $ 31,332
Financing Receivable, Nonaccrual, No Allowance | 30,701 |  | 35,528
Tdrs Recorded Investment On Nonaccrual Status | 21,167 |  | 22,209
Financing Receivable Recorded Investment Trouble Debt Restructuring | 41,429 |  | 39,192
Additional Commitments To Lend To Borrower For Trouble Debt Restructuring | 466 |  | 263
Financing Receivable, Nonaccrual | 59,200 | [1] | 66,860
Tdrs Recorded Investment On Accrual Status | 20,262 |  | 16,983
Commercial And Industrial [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance | 3,606 |  | 3,804
Financing Receivable, Nonaccrual, No Allowance | 26,179 |  | 30,925
Financing Receivable, Nonaccrual | 29,785 |  | 34,729
Commercial Real Estate [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance | 9,635 |  | 10,195
Financing Receivable, Nonaccrual | 9,635 |  | 10,195
Small Business [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance | 660 |  | 815
Financing Receivable, Nonaccrual, No Allowance |  |  | 10
Financing Receivable, Nonaccrual | 660 |  | 825
Residential Real Estate [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance | 8,870 |  | 10,935
Financing Receivable, Nonaccrual, No Allowance | 4,522 |  | 4,593
Financing Receivable, Nonaccrual | 13,392 |  | 15,528
Home Equity Line of Credit [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance | 5,592 |  | 5,427
Financing Receivable, Nonaccrual | 5,592 |  | 5,427
Consumer - Other [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance | 136 |  | 156
Financing Receivable, Nonaccrual | $ 136 |  | $ 156
[1] | Included in these amounts were $21.2 million and $22.2 million of nonaccruing TDRs at March 31, 2021 and December 31, 2020, respectively.

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