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Loans, Allowance for Loan Losses and Credit Quality (Age Analysis of Past Due Financing Receivables) (Details) $ in Thousands | Sep. 30, 2016 USD ($) loan | Dec. 31, 2015 USD ($) loan
--- | --- | ---
Age Analysis of Past Due Financing Receivables |  |
Number of Loans 30-59 Days | loan | 304 | 377
Number of Loans 60-89 Days | loan | 57 | 48
Number of Loans 90 Days or More | loan | 104 | 87
Number of Loans Total Past Due | loan | 465 | 512
Principal Balance Total Past Due | $ 25,516 | $ 31,057
Current | 5,720,617 | 5,516,664
Loans and Leases Receivable, Gross | 5,746,133 | 5,547,721
Recorded Investment >90 Days and Accruing | $ 2 | $ 0
Commercial and Industrial [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Number of Loans 30-59 Days | loan | 5 | 9
Number of Loans 60-89 Days | loan | 2 | 4
Number of Loans 90 Days or More | loan | 6 | 8
Number of Loans Total Past Due | loan | 13 | 21
Principal Balance Total Past Due | $ 3,225 | $ 4,459
Current | 854,488 | 838,817
Loans and Leases Receivable, Gross | 857,713 | 843,276
Recorded Investment >90 Days and Accruing | $ 0 | $ 0
Commercial Real Estate [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Number of Loans 30-59 Days | loan | 6 | 19
Number of Loans 60-89 Days | loan | 9 | 6
Number of Loans 90 Days or More | loan | 8 | 13
Number of Loans Total Past Due | loan | 23 | 38
Principal Balance Total Past Due | $ 9,368 | $ 13,434
Current | 2,778,292 | 2,640,000
Loans and Leases Receivable, Gross | 2,787,660 | 2,653,434
Recorded Investment >90 Days and Accruing | $ 0 | $ 0
Construction Loans [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Number of Loans 30-59 Days | loan | 0 | 0
Number of Loans 60-89 Days | loan | 0 | 0
Number of Loans 90 Days or More | loan | 0 | 1
Number of Loans Total Past Due | loan | 0 | 1
Principal Balance Total Past Due | $ 0 | $ 304
Current | 376,245 | 373,064
Loans and Leases Receivable, Gross | 376,245 | 373,368
Recorded Investment >90 Days and Accruing | $ 0 | $ 0
Small Business [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Number of Loans 30-59 Days | loan | 16 | 11
Number of Loans 60-89 Days | loan | 5 | 4
Number of Loans 90 Days or More | loan | 18 | 13
Number of Loans Total Past Due | loan | 39 | 28
Principal Balance Total Past Due | $ 511 | $ 171
Current | 114,543 | 96,075
Loans and Leases Receivable, Gross | 115,054 | 96,246
Recorded Investment >90 Days and Accruing | $ 0 | $ 0
Residential Real Estate [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Number of Loans 30-59 Days | loan | 13 | 20
Number of Loans 60-89 Days | loan | 11 | 11
Number of Loans 90 Days or More | loan | 27 | 19
Number of Loans Total Past Due | loan | 51 | 50
Principal Balance Total Past Due | $ 8,535 | $ 8,601
Current | 624,150 | 630,005
Loans and Leases Receivable, Gross | 632,685 | 638,606
Recorded Investment >90 Days and Accruing | $ 0 | $ 0
Consumer Home Equity [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Number of Loans 30-59 Days | loan | 14 | 21
Number of Loans 60-89 Days | loan | 11 | 11
Number of Loans 90 Days or More | loan | 30 | 20
Number of Loans Total Past Due | loan | 55 | 52
Principal Balance Total Past Due | $ 3,604 | $ 3,767
Current | 961,508 | 924,036
Loans and Leases Receivable, Gross | 965,112 | 927,803
Recorded Investment >90 Days and Accruing | $ 0 | $ 0
Consumer - Other [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Number of Loans 30-59 Days | loan | 250 | 297
Number of Loans 60-89 Days | loan | 19 | 12
Number of Loans 90 Days or More | loan | 15 | 13
Number of Loans Total Past Due | loan | 284 | 322
Principal Balance Total Past Due | $ 273 | $ 321
Current | 11,391 | 14,667
Loans and Leases Receivable, Gross | 11,664 | 14,988
Recorded Investment >90 Days and Accruing | 2 | 0
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 8,100 | 12,717
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and Industrial [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 436 | 399
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 3,396 | 7,349
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction Loans [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 0 | 0
Financing Receivables, 30 to 59 Days Past Due [Member] | Small Business [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 218 | 93
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Real Estate [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 2,621 | 3,119
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Home Equity [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 1,199 | 1,526
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer - Other [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 230 | 231
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 4,830 | 5,674
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and Industrial [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 205 | 1,021
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 2,200 | 1,627
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction Loans [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 0 | 0
Financing Receivables, 60 to 89 Days Past Due [Member] | Small Business [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 90 | 9
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Real Estate [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 1,692 | 2,049
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Home Equity [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 611 | 903
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer - Other [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 32 | 65
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 12,586 | 12,666
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 2,584 | 3,039
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 3,772 | 4,458
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction Loans [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 0 | 304
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Small Business [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 203 | 69
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Real Estate [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 4,222 | 3,433
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Home Equity [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 1,794 | 1,338
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer - Other [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | $ 11 | $ 25

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