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Loans, Allowance for Loan Losses and Credit Quality (Allowance Allocations) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | $ 8,880,512 | $ 6,838,339
Ending Balance: Individually Evaluated for Impairment |  | 54,163 | 59,060
Financing Receivable, after Allowance for Credit Loss |  | 6,124,515 | 4,874,718
Ending Balance: Total Loans by Group | [1] | 8,950,787 | 6,906,194
Financial Asset Acquired with Credit Deterioration [Member] |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |
Financing Receivable, after Allowance for Credit Loss |  | 16,112 | 8,795
Commercial and Industrial [Member] |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | 1,373,573 | 1,064,800
Ending Balance: Individually Evaluated for Impairment |  | 27,351 | 28,829
Financing Receivable, after Allowance for Credit Loss |  | 1,400,924 | 1,093,629
Ending Balance: Total Loans by Group | [1] | 1,400,924 | 1,093,629
Commercial and Industrial [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |
Financing Receivable, after Allowance for Credit Loss |  | 0 | 0
Commercial Real Estate [Member] |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | 4,042,092 | 3,235,418
Ending Balance: Individually Evaluated for Impairment |  | 9,069 | 10,839
Financing Receivable, after Allowance for Credit Loss |  | 4,058,066 | 3,251,248
Ending Balance: Total Loans by Group | [1] | 4,058,066 | 3,251,248
Commercial Real Estate [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |
Financing Receivable, after Allowance for Credit Loss |  | 6,905 | 4,991
Construction Loans [Member] |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | 491,598 | 365,165
Ending Balance: Individually Evaluated for Impairment |  | 0 | 0
Financing Receivable, after Allowance for Credit Loss |  | 491,598 | 365,165
Ending Balance: Total Loans by Group | [1] | 491,598 | 365,165
Construction Loans [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |
Financing Receivable, after Allowance for Credit Loss |  | 0 | 0
Small Business [Member] |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | 173,397 | 164,135
Ending Balance: Individually Evaluated for Impairment |  | 530 | 541
Financing Receivable, after Allowance for Credit Loss |  | 173,927 | 164,676
Ending Balance: Total Loans by Group | [1] | 173,927 | 164,676
Small Business [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |
Financing Receivable, after Allowance for Credit Loss |  | 0 | 0
Residential Real Estate [Member] |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | 1,636,033 | 906,959
Ending Balance: Individually Evaluated for Impairment |  | 11,351 | 12,706
Ending Balance: Total Loans by Group | [1] | 1,655,182 | 923,294
Residential Real Estate [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |
Financing Receivable, after Allowance for Credit Loss |  | 7,798 | 3,629
Consumer Home Equity [Member] |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | 1,137,736 | 1,085,961
Ending Balance: Individually Evaluated for Impairment |  | 5,689 | 5,948
Ending Balance: Total Loans by Group | [1] | 1,144,499 | 1,092,084
Consumer Home Equity [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |
Financing Receivable, after Allowance for Credit Loss |  | 1,074 | 175
Consumer Other [Member] |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | 26,083 | 15,901
Ending Balance: Individually Evaluated for Impairment |  | 173 | 197
Ending Balance: Total Loans by Group | [1],[2] | 26,591 | 16,098
Consumer Other [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |
Financing Receivable, after Allowance for Credit Loss |  | $ 335 | $ 0
[1] | The amount of net deferred costs on originated loans included in the ending balance was $7.9 million and $7.1 million at June 30, 2019 and December 31, 2018, respectively. Net unamortized discounts on acquired loans not deemed to be purchased credit impaired ("PCI") included in the ending balance was $29.8 million and $15.2 million at June 30, 2019 and December 31, 2018, respectively.
[2] | (2) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

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