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Loans, Allowance for Loan Losses and Credit Quality (Allowance Allocations) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | $ 6,453,703 | $ 6,269,729 |
Ending Balance: Individually Evaluated for Impairment |  | 64,031 | 72,801 |
Financing Receivable, Net |  | 4,637,962 | 4,539,256 |
Ending Balance: Total Loans by Group | [1] | 6,527,402 | 6,355,553 |
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |
Financing Receivable, Net |  | 9,668 | 13,023 |
Commercial and Industrial [Member] |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | 972,842 | 853,885 |
Ending Balance: Individually Evaluated for Impairment |  | 30,938 | 34,643 |
Financing Receivable, Net |  | 1,003,780 | 888,528 |
Ending Balance: Total Loans by Group | [1] | 1,003,780 | 888,528 |
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, Net |  | 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 |  | 3,114,414 | 3,093,945 |
Ending Balance: Individually Evaluated for Impairment |  | 13,023 | 16,638 |
Financing Receivable, Net |  | 3,132,491 | 3,116,561 |
Ending Balance: Total Loans by Group | [1] | 3,132,491 | 3,116,561 |
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, Net |  | 5,054 | 5,978 |
Construction Loans [Member] |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | 352,491 | 401,797 |
Ending Balance: Individually Evaluated for Impairment |  | 0 | 0 |
Financing Receivable, Net |  | 352,491 | 401,797 |
Ending Balance: Total Loans by Group | [1] | 352,491 | 401,797 |
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, Net |  | 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 |  | 148,609 | 131,667 |
Ending Balance: Individually Evaluated for Impairment |  | 591 | 703 |
Financing Receivable, Net |  | 149,200 | 132,370 |
Ending Balance: Total Loans by Group | [1] | 149,200 | 132,370 |
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, Net |  | 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 |  | 784,533 | 733,809 |
Ending Balance: Individually Evaluated for Impairment |  | 12,825 | 13,684 |
Ending Balance: Total Loans by Group | [1] | 801,810 | 754,329 |
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, Net |  | 4,452 | 6,836 |
Consumer Home Equity [Member] |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | 1,067,389 | 1,045,053 |
Ending Balance: Individually Evaluated for Impairment |  | 6,410 | 6,826 |
Ending Balance: Total Loans by Group | [1] | 1,073,961 | 1,052,088 |
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, Net |  | 162 | 209 |
Consumer Other [Member] |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | 13,425 | 9,573 |
Ending Balance: Individually Evaluated for Impairment |  | 244 | 307 |
Ending Balance: Total Loans by Group | [1] | 13,669 | 9,880 | [2]
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, Net |  | $ 0 | $ 0 |
[1] | The amount of net deferred costs on originated loans included in the ending balance was $6.9 million and $6.1 million at September 30, 2018 and December 31, 2017, respectively. Net unamortized discounts on acquired loans not deemed to be purchased credit impaired ("PCI") included in the ending balance was $8.6 million and $9.4 million at September 30, 2018 and December 31, 2017, respectively.
[2] | (1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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