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Loans, Allowance for Loan Losses and Credit Quality (Allowance Allocations) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 contract | Sep. 30, 2017 USD ($) contract | Sep. 30, 2016 contract | Dec. 31, 2016 USD ($)
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | $ 6,198,610 |  | $ 5,903,916
Ending Balance: Individually Evaluated for Impairment |  | 76,120 |  | 77,297
Financing Receivable, Net |  | 4,471,605 |  | 4,355,968
Ending Balance: Total Loans by Group |  | 6,289,902 |  | 5,999,605
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |
Financing Receivable, Net |  | 15,172 |  | 18,392
Commercial and Industrial [Member] |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | 823,007 |  | 862,875
Ending Balance: Individually Evaluated for Impairment |  | 35,515 |  | 39,178
Financing Receivable, Net |  | 858,522 |  | 902,053
Ending Balance: Total Loans by Group |  | 858,522 |  | 902,053
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 |  | 3,060,211 |  | 2,983,642
Ending Balance: Individually Evaluated for Impairment |  | 19,018 |  | 16,813
Financing Receivable, Net |  | 3,087,160 |  | 3,010,798
Ending Balance: Total Loans by Group |  | 3,087,160 |  | 3,010,798
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 |  | 7,931 |  | 10,343
Construction Loans [Member] |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | 395,267 |  | 320,391
Ending Balance: Individually Evaluated for Impairment |  | 0 |  | 0
Financing Receivable, Net |  | 395,267 |  | 320,391
Ending Balance: Total Loans by Group |  | 395,267 |  | 320,391
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 |  | 129,676 |  | 121,855
Ending Balance: Individually Evaluated for Impairment |  | 980 |  | 871
Financing Receivable, Net |  | 130,656 |  | 122,726
Ending Balance: Total Loans by Group |  | 130,656 |  | 122,726
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] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract |  | 1 |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | $ 735,454 |  | 622,392
Ending Balance: Individually Evaluated for Impairment |  | 13,649 |  | 14,175
Ending Balance: Total Loans by Group |  | 756,130 |  | 644,426
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 |  | 7,027 |  | 7,859
Consumer Home Equity [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | contract | 1 |  | 1 |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | 1,045,445 |  | 982,095
Ending Balance: Individually Evaluated for Impairment |  | 6,636 |  | 5,863
Ending Balance: Total Loans by Group |  | 1,052,295 |  | 988,147
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 |  | 214 |  | 189
Consumer Other [Member] |  |  |  |
Allowance for loans based on collective and individual evaluation of impairment by loan category |  |  |  |
Ending Balance: Collectively Evaluated for Impairment |  | 9,550 |  | 10,666
Ending Balance: Individually Evaluated for Impairment |  | 322 |  | 397
Ending Balance: Total Loans by Group |  | 9,872 |  | 11,064
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 |  | $ 0 |  | $ 1

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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=84173941&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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