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Loans, Allowance for Loan Losses and Credit Quality (Age Analysis of Past Due Financing Receivables) (Details) $ in Thousands | Mar. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($) loan
--- | --- | ---
Age Analysis of Past Due Financing Receivables |  |
Number of Loans 30-59 Days | loan | 285 | 301
Number of Loans 60-89 Days | loan | 40 | 72
Number of Loans 90 Days or More | loan | 114 | 91
Number of Loans Total Past Due | loan | 439 | 464
Principal Balance Total Past Due | $ 35,071 | $ 19,911
Current | 6,029,295 | 5,979,694
Total loans | 6,064,366 | 5,999,605
Recorded Investment >90 Days and Accruing | $ 2 | $ 2
Commercial and Industrial [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Number of Loans 30-59 Days | loan | 10 | 8
Number of Loans 60-89 Days | loan | 6 | 32
Number of Loans 90 Days or More | loan | 34 | 6
Number of Loans Total Past Due | loan | 50 | 46
Principal Balance Total Past Due | $ 18,878 | $ 2,833
Current | 862,451 | 899,220
Total loans | 881,329 | 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 | 15 | 5
Number of Loans 60-89 Days | loan | 0 | 8
Number of Loans 90 Days or More | loan | 9 | 8
Number of Loans Total Past Due | loan | 24 | 21
Principal Balance Total Past Due | $ 6,299 | $ 6,580
Current | 3,021,006 | 3,004,218
Total loans | 3,027,305 | 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 | 356,173 | 320,391
Total loans | 356,173 | 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 | 9 | 9
Number of Loans 60-89 Days | loan | 8 | 0
Number of Loans 90 Days or More | loan | 13 | 19
Number of Loans Total Past Due | loan | 30 | 28
Principal Balance Total Past Due | $ 559 | $ 463
Current | 125,815 | 122,263
Total loans | 126,374 | 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 | 11 | 11
Number of Loans 60-89 Days | loan | 6 | 9
Number of Loans 90 Days or More | loan | 23 | 27
Number of Loans Total Past Due | loan | 40 | 47
Principal Balance Total Past Due | $ 6,093 | $ 6,734
Current | 647,906 | 637,692
Total loans | 653,999 | 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 | 14 | 19
Number of Loans 60-89 Days | loan | 6 | 11
Number of Loans 90 Days or More | loan | 18 | 16
Number of Loans Total Past Due | loan | 38 | 46
Principal Balance Total Past Due | $ 3,033 | $ 3,093
Current | 1,005,738 | 985,054
Total loans | 1,008,771 | 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 | 226 | 249
Number of Loans 60-89 Days | loan | 14 | 12
Number of Loans 90 Days or More | loan | 17 | 15
Number of Loans Total Past Due | loan | 257 | 276
Principal Balance Total Past Due | $ 209 | $ 208
Current | 10,206 | 10,856
Total loans | 10,415 | 11,064
Recorded Investment >90 Days and Accruing | 2 | 2
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 9,752 | 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 | 3,089 | 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 | 3,158 | 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 | 331 | 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 | 1,867 | 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 | 1,156 | 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 | 151 | 184
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 16,244 | 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 | 14,666 | 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 | 108 | 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 | 968 | 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 | 460 | 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 | 42 | 17
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 9,075 | 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 | 1,123 | 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 | 3,141 | 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 | 120 | 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 | 3,258 | 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 | 1,417 | 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 | $ 16 | $ 7

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