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Loans, Allowance for Loan Losses and Credit Quality (Allowance Allocations) (Details) - USD ($) $ in Thousands | Sep. 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 |  | $ 8,840,602 | $ 6,838,339
Ending Balance: Individually Evaluated for Impairment |  | 56,940 | 59,060
Financing Receivable, after Allowance for Credit Loss |  | 6,104,626 | 4,874,718
Ending Balance: Total Loans by Group | [1] | 8,913,501 | 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 |  | 15,959 | 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 |  | 1,385,379 | 1,064,800
Ending Balance: Individually Evaluated for Impairment |  | 26,137 | 28,829
Financing Receivable, after Allowance for Credit Loss |  | 1,411,516 | 1,093,629
Ending Balance: Total Loans by Group | [1] | 1,411,516 | 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 |  | 3,979,670 | 3,235,418
Ending Balance: Individually Evaluated for Impairment |  | 13,984 | 10,839
Financing Receivable, after Allowance for Credit Loss |  | 4,000,487 | 3,251,248
Ending Balance: Total Loans by Group | [1] | 4,000,487 | 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 |  | 6,833 | 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 |  | 520,585 | 365,165
Ending Balance: Individually Evaluated for Impairment |  | 0 | 0
Financing Receivable, after Allowance for Credit Loss |  | 520,585 | 365,165
Ending Balance: Total Loans by Group | [1] | 520,585 | 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 |  | 171,723 | 164,135
Ending Balance: Individually Evaluated for Impairment |  | 315 | 541
Financing Receivable, after Allowance for Credit Loss |  | 172,038 | 164,676
Ending Balance: Total Loans by Group | [1] | 172,038 | 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 |  | 1,625,923 | 906,959
Ending Balance: Individually Evaluated for Impairment |  | 11,039 | 12,706
Ending Balance: Total Loans by Group | [1] | 1,644,758 | 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 |  | 7,796 | 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 |  | 1,130,777 | 1,085,961
Ending Balance: Individually Evaluated for Impairment |  | 5,325 | 5,948
Ending Balance: Total Loans by Group | [1] | 1,137,109 | 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 |  | 1,007 | 175
Consumer Other [Member] |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | 26,545 | 15,901
Ending Balance: Individually Evaluated for Impairment |  | 140 | 197
Ending Balance: Total Loans by Group | [1],[2] | 27,008 | 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 |  | $ 323 | $ 0
[1] | The amount of net deferred costs on originated loans included in the ending balance was $7.2 million and $7.1 million at September 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 $24.7 million and $15.2 million at September 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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