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Loans, Allowance for Loan Losses and Credit Quality (Allowance Allocations) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums | $ 10,900 | $ 10,900
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |
Ending Balance: Collectively Evaluated for Impairment | 5,682,830 | 5,475,716
Ending Balance: Individually Evaluated for Impairment | 44,029 | 51,410
Financing Receivable, Net | 4,136,672 | 3,966,324
Ending Balance: Total Loans by Group | 5,746,133 | 5,547,721
Receivables Acquired with Deteriorated Credit Quality [Member] |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |
Financing Receivable, Net | 19,274 | 20,595
Commercial and Industrial [Member] |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |
Ending Balance: Collectively Evaluated for Impairment | 853,245 | 838,129
Ending Balance: Individually Evaluated for Impairment | 4,468 | 5,147
Financing Receivable, Net | 857,713 | 843,276
Ending Balance: Total Loans by Group | 857,713 | 843,276
Commercial and Industrial [Member] | Receivables Acquired with Deteriorated Credit Quality [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 | 2,759,158 | 2,619,294
Ending Balance: Individually Evaluated for Impairment | 18,077 | 22,986
Financing Receivable, Net | 2,787,660 | 2,653,434
Ending Balance: Total Loans by Group | 2,787,660 | 2,653,434
Commercial Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |
Financing Receivable, Net | 10,425 | 11,154
Construction Loans [Member] |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |
Ending Balance: Collectively Evaluated for Impairment | 376,245 | 373,064
Ending Balance: Individually Evaluated for Impairment | 0 | 304
Financing Receivable, Net | 376,245 | 373,368
Ending Balance: Total Loans by Group | 376,245 | 373,368
Construction Loans [Member] | Receivables Acquired with Deteriorated Credit Quality [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 | 114,085 | 95,225
Ending Balance: Individually Evaluated for Impairment | 969 | 1,021
Financing Receivable, Net | 115,054 | 96,246
Ending Balance: Total Loans by Group | 115,054 | 96,246
Small Business [Member] | Receivables Acquired with Deteriorated Credit Quality [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 | 609,854 | 614,014
Ending Balance: Individually Evaluated for Impairment | 14,193 | 15,405
Ending Balance: Total Loans by Group | 632,685 | 638,606
Residential Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |
Financing Receivable, Net | 8,638 | 9,187
Consumer Home Equity [Member] |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |
Ending Balance: Collectively Evaluated for Impairment | 958,999 | 921,563
Ending Balance: Individually Evaluated for Impairment | 5,904 | 5,989
Ending Balance: Total Loans by Group | 965,112 | 927,803
Consumer Home Equity [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |
Financing Receivable, Net | 209 | 251
Consumer Other [Member] |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |
Ending Balance: Collectively Evaluated for Impairment | 11,244 | 14,427
Ending Balance: Individually Evaluated for Impairment | 418 | 558
Ending Balance: Total Loans by Group | 11,664 | 14,988
Consumer Other [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |
Financing Receivable, Net | $ 2 | $ 3

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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