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Loans, Allowance for Credit Losses and Credit Quality Finance Receivable, Nonaccrual (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance | $ 26,618 |  | $ 31,332
Financing Receivable, Nonaccrual, No Allowance | 21,200 |  | 35,528
Tdrs Recorded Investment On Nonaccrual Status | 20,212 |  | 22,209
Financing Receivable Recorded Investment Trouble Debt Restructuring | 39,707 |  | 39,192
Additional Commitments To Lend To Borrower For Trouble Debt Restructuring | 412 |  | 263
Financing Receivable, Nonaccrual | 47,818 | [1] | 66,860
Tdrs Recorded Investment On Accrual Status | 19,495 |  | 16,983
Commercial And Industrial [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance | 3,465 |  | 3,804
Financing Receivable, Nonaccrual, No Allowance | 17,366 |  | 30,925
Financing Receivable, Nonaccrual | 20,831 |  | 34,729
Commercial Real Estate [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance | 9,031 |  | 10,195
Financing Receivable, Nonaccrual, No Allowance | 0 |  | 0
Financing Receivable, Nonaccrual | 9,031 |  | 10,195
Small Business [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance | 558 |  | 815
Financing Receivable, Nonaccrual, No Allowance | 0 |  | 10
Financing Receivable, Nonaccrual | 558 |  | 825
Residential Real Estate [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance | 8,952 |  | 10,935
Financing Receivable, Nonaccrual, No Allowance | 3,834 |  | 4,593
Financing Receivable, Nonaccrual | 12,786 |  | 15,528
Home Equity Line of Credit [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance | 4,517 |  | 5,427
Financing Receivable, Nonaccrual, No Allowance | 0 |  | 0
Financing Receivable, Nonaccrual | 4,517 |  | 5,427
Consumer - Other [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance | 95 |  | 156
Financing Receivable, Nonaccrual, No Allowance | 0 |  | 0
Financing Receivable, Nonaccrual | $ 95 |  | $ 156
[1] | Included in these amounts were $20.2 million and $22.2 million of nonaccruing TDRs at June 30, 2021 and December 31, 2020, respectively.

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