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Loans, Allowance for Loan Losses and Credit Quality (Age Analysis of Past Due Financing Receivables) (Details) $ in Thousands | Sep. 30, 2017 USD ($) loan | Dec. 31, 2016 USD ($) loan
--- | --- | ---
Age Analysis of Past Due Financing Receivables |  |
Number of Loans 30-59 Days | loan | 295 | 301
Number of Loans 60-89 Days | loan | 36 | 72
Number of Loans 90 Days or More | loan | 122 | 91
Number of Loans Total Past Due | loan | 453 | 464
Principal Balance Total Past Due | $ 51,358 | $ 19,911
Current | 6,238,544 | 5,979,694
Total loans | 6,289,902 | 5,999,605
Recorded Investment >90 Days and Accruing | $ 7 | $ 2
Commercial and Industrial [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Number of Loans 30-59 Days | loan | 12 | 8
Number of Loans 60-89 Days | loan | 2 | 32
Number of Loans 90 Days or More | loan | 45 | 6
Number of Loans Total Past Due | loan | 59 | 46
Principal Balance Total Past Due | $ 33,644 | $ 2,833
Current | 824,878 | 899,220
Total loans | 858,522 | 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 | 10 | 5
Number of Loans 60-89 Days | loan | 0 | 8
Number of Loans 90 Days or More | loan | 8 | 8
Number of Loans Total Past Due | loan | 18 | 21
Principal Balance Total Past Due | $ 6,168 | $ 6,580
Current | 3,080,992 | 3,004,218
Total loans | 3,087,160 | 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 | 1 | 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 | 1 | 0
Principal Balance Total Past Due | $ 566 | $ 0
Current | 394,701 | 320,391
Total loans | 395,267 | 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 | 11 | 9
Number of Loans 60-89 Days | loan | 5 | 0
Number of Loans 90 Days or More | loan | 17 | 19
Number of Loans Total Past Due | loan | 33 | 28
Principal Balance Total Past Due | $ 251 | $ 463
Current | 130,405 | 122,263
Total loans | 130,656 | 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 | 12 | 11
Number of Loans 60-89 Days | loan | 10 | 9
Number of Loans 90 Days or More | loan | 20 | 27
Number of Loans Total Past Due | loan | 42 | 47
Principal Balance Total Past Due | $ 6,360 | $ 6,734
Current | 749,770 | 637,692
Total loans | 756,130 | 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 | 20 | 19
Number of Loans 60-89 Days | loan | 9 | 11
Number of Loans 90 Days or More | loan | 20 | 16
Number of Loans Total Past Due | loan | 49 | 46
Principal Balance Total Past Due | $ 4,091 | $ 3,093
Current | 1,048,204 | 985,054
Total loans | 1,052,295 | 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 | 229 | 249
Number of Loans 60-89 Days | loan | 10 | 12
Number of Loans 90 Days or More | loan | 12 | 15
Number of Loans Total Past Due | loan | 251 | 276
Principal Balance Total Past Due | $ 278 | $ 208
Current | 9,594 | 10,856
Total loans | 9,872 | 11,064
Recorded Investment >90 Days and Accruing | 7 | 2
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 8,315 | 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 | 839 | 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 | 4,413 | 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 | 566 | 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 | 130 | 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 | 1,125 | 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 | 1,016 | 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 | 226 | 184
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 3,275 | 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 | 315 | 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 | 0 | 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 | 14 | 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 | 2,392 | 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 | 516 | 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 | 38 | 17
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 39,768 | 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 | 32,490 | 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 | 1,755 | 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 | 107 | 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 | 2,843 | 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 | 2,559 | 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 | $ 14 | $ 7

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