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Loans, Allowance for Loan Losses and Credit Quality Finance Receivables Bifurcated by type of impairment evaluation (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing Receivable, Collectively Evaluated for Impairment |  | $ 8,809,155 |
Financing Receivable, Individually Evaluated for Impairment |  | 49,628 |
Financing Receivable, after Allowance for Credit Loss |  | 6,119,185 |
Loans and Leases Receivable, Gross | $ 8,916,430 | 8,873,639 |
Unamortized Loan Commitment and Origination fees |  | 7,100 |
Unamortized Discounts or Premiums |  | 21,600 |
Commercial And Industrial [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 1,370,580 |
Financing Receivable, Individually Evaluated for Impairment |  | 24,456 |
Financing Receivable, after Allowance for Credit Loss |  | 1,395,036 |
Financing Receivable, before Allowance for Credit Loss | 1,448,224 | 1,395,036 |
Loans and Leases Receivable, Gross | 1,448,224 | 1,395,036 |
Commercial Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 3,987,848 |
Financing Receivable, Individually Evaluated for Impairment |  | 8,337 |
Financing Receivable, after Allowance for Credit Loss |  | 4,002,359 |
Financing Receivable, before Allowance for Credit Loss | 4,061,347 | 4,002,359 |
Loans and Leases Receivable, Gross | 4,061,347 | 4,002,359 |
Construction Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 547,293 |
Financing Receivable, Individually Evaluated for Impairment |  | 0 |
Financing Receivable, after Allowance for Credit Loss |  | 547,293 |
Financing Receivable, before Allowance for Credit Loss | 527,138 | 547,293 |
Loans and Leases Receivable, Gross | 527,138 | 547,293 |
Small Business [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 173,960 |
Financing Receivable, Individually Evaluated for Impairment |  | 537 |
Financing Receivable, after Allowance for Credit Loss |  | 174,497 |
Financing Receivable, before Allowance for Credit Loss | 177,820 | 174,497 |
Loans and Leases Receivable, Gross | 177,820 | 174,497 |
Residential Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 1,571,848 |
Financing Receivable, Individually Evaluated for Impairment |  | 11,228 |
Financing Receivable, before Allowance for Credit Loss | 1,528,416 | 1,590,569 |
Loans and Leases Receivable, Gross | 1,528,416 | 1,590,569 |
Home Equity Line of Credit [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 1,127,963 |
Financing Receivable, Individually Evaluated for Impairment |  | 4,948 |
Loans and Leases Receivable, Gross | 1,146,270 | 1,133,798 |
Consumer - Other [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing Receivable, Collectively Evaluated for Impairment |  | 29,663 |
Financing Receivable, Individually Evaluated for Impairment |  | 122 |
Financing Receivable, before Allowance for Credit Loss | 27,215 | 30,087 |
Loans and Leases Receivable, Gross | $ 27,215 | 30,087 | [1]
Financial Asset Acquired with Credit Deterioration [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing Receivable, after Allowance for Credit Loss |  | 14,856 |
Financial Asset Acquired with Credit Deterioration [Member] | Commercial And Industrial [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing Receivable, after Allowance for Credit Loss |  | 0 |
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing Receivable, after Allowance for Credit Loss |  | 6,174 |
Financial Asset Acquired with Credit Deterioration [Member] | Construction Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing Receivable, after Allowance for Credit Loss |  | 0 |
Financial Asset Acquired with Credit Deterioration [Member] | Small Business [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing Receivable, after Allowance for Credit Loss |  | 0 |
Financial Asset Acquired with Credit Deterioration [Member] | Residential Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing Receivable, after Allowance for Credit Loss |  | 7,493 |
Financial Asset Acquired with Credit Deterioration [Member] | Home Equity Line of Credit [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing Receivable, after Allowance for Credit Loss |  | 887 |
Financial Asset Acquired with Credit Deterioration [Member] | Consumer - Other [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Financing Receivable, after Allowance for Credit Loss |  | $ 302 |
[1] | (1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

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