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Loans, Allowance for Loan Losses and Credit Quality (Age Analysis of Past Due Financing Receivables) (Details) $ in Thousands | Jun. 30, 2017 USD ($) loan | Dec. 31, 2016 USD ($) loan
--- | --- | ---
Age Analysis of Past Due Financing Receivables |  |
Number of Loans 30-59 Days | loan | 275 | 301
Number of Loans 60-89 Days | loan | 41 | 72
Number of Loans 90 Days or More | loan | 122 | 91
Number of Loans Total Past Due | loan | 438 | 464
Principal Balance Total Past Due | $ 51,515 | $ 19,911
Current | 6,218,181 | 5,979,694
Total loans | 6,269,696 | 5,999,605
Recorded Investment >90 Days and Accruing | $ 8 | $ 2
Commercial and Industrial [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Number of Loans 30-59 Days | loan | 3 | 8
Number of Loans 60-89 Days | loan | 7 | 32
Number of Loans 90 Days or More | loan | 42 | 6
Number of Loans Total Past Due | loan | 52 | 46
Principal Balance Total Past Due | $ 33,582 | $ 2,833
Current | 877,354 | 899,220
Total loans | 910,936 | 902,053
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 | 8 | 5
Number of Loans 60-89 Days | loan | 2 | 8
Number of Loans 90 Days or More | loan | 9 | 8
Number of Loans Total Past Due | loan | 19 | 21
Principal Balance Total Past Due | $ 7,390 | $ 6,580
Current | 3,075,630 | 3,004,218
Total loans | 3,083,020 | 3,010,798
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 | 0
Number of Loans Total Past Due | loan | 0 | 0
Principal Balance Total Past Due | $ 0 | $ 0
Current | 340,757 | 320,391
Total loans | 340,757 | 320,391
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 | 10 | 9
Number of Loans 60-89 Days | loan | 5 | 0
Number of Loans 90 Days or More | loan | 16 | 19
Number of Loans Total Past Due | loan | 31 | 28
Principal Balance Total Past Due | $ 558 | $ 463
Current | 131,105 | 122,263
Total loans | 131,663 | 122,726
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 | 14 | 11
Number of Loans 60-89 Days | loan | 8 | 9
Number of Loans 90 Days or More | loan | 18 | 27
Number of Loans Total Past Due | loan | 40 | 47
Principal Balance Total Past Due | $ 6,292 | $ 6,734
Current | 743,100 | 637,692
Total loans | 749,392 | 644,426
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 | 17 | 19
Number of Loans 60-89 Days | loan | 10 | 11
Number of Loans 90 Days or More | loan | 15 | 16
Number of Loans Total Past Due | loan | 42 | 46
Principal Balance Total Past Due | $ 3,460 | $ 3,093
Current | 1,039,999 | 985,054
Total loans | 1,043,459 | 988,147
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 | 223 | 249
Number of Loans 60-89 Days | loan | 9 | 12
Number of Loans 90 Days or More | loan | 22 | 15
Number of Loans Total Past Due | loan | 254 | 276
Principal Balance Total Past Due | $ 233 | $ 208
Current | 10,236 | 10,856
Total loans | 10,469 | 11,064
Recorded Investment >90 Days and Accruing | 8 | 2
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 7,072 | 4,519
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 | 222 | 100
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 | 3,847 | 1,518
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 | 198 | 323
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 | 1,712 | 1,277
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 | 946 | 1,117
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer - Other [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 147 | 184
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 21,946 | 4,944
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 | 18,644 | 253
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 | 422 | 1,957
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 | 49 | 0
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 | 1,529 | 1,950
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 | 1,258 | 767
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer - Other [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 44 | 17
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 22,497 | 10,448
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 | 14,716 | 2,480
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 | 3,121 | 3,105
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 | 0
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 | 311 | 140
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 | 3,051 | 3,507
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 | 1,256 | 1,209
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 | $ 42 | $ 7

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