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Loans, Allowance for Loan Losses and Credit Quality (Age Analysis of Past Due Financing Receivables) (Details) $ in Thousands | Jun. 30, 2016 USD ($) loan | Dec. 31, 2015 USD ($) loan
--- | --- | ---
Age Analysis of Past Due Financing Receivables |  |
Number of Loans 30-59 Days | loan | 309 | 377
Number of Loans 60-89 Days | loan | 42 | 48
Number of Loans 90 Days or More | loan | 101 | 87
Number of Loans Total Past Due | loan | 452 | 512
Principal Balance Total Past Due | $ 26,944 | $ 31,057
Current | 5,647,309 | 5,516,664
Loans and Leases Receivable, Gross | 5,674,253 | 5,547,721
Recorded Investment >90 Days and Accruing | $ 1 | $ 0
Commercial and Industrial [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Number of Loans 30-59 Days | loan | 3 | 9
Number of Loans 60-89 Days | loan | 0 | 4
Number of Loans 90 Days or More | loan | 10 | 8
Number of Loans Total Past Due | loan | 13 | 21
Principal Balance Total Past Due | $ 2,888 | $ 4,459
Current | 872,276 | 838,817
Loans and Leases Receivable, Gross | 875,164 | 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 | 14 | 19
Number of Loans 60-89 Days | loan | 3 | 6
Number of Loans 90 Days or More | loan | 9 | 13
Number of Loans Total Past Due | loan | 26 | 38
Principal Balance Total Past Due | $ 12,056 | $ 13,434
Current | 2,715,087 | 2,640,000
Loans and Leases Receivable, Gross | 2,727,143 | 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 | 367,559 | 373,064
Loans and Leases Receivable, Gross | 367,559 | 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 | 10 | 11
Number of Loans 60-89 Days | loan | 3 | 4
Number of Loans 90 Days or More | loan | 17 | 13
Number of Loans Total Past Due | loan | 30 | 28
Principal Balance Total Past Due | $ 280 | $ 171
Current | 110,755 | 96,075
Loans and Leases Receivable, Gross | 111,035 | 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 | 19 | 20
Number of Loans 60-89 Days | loan | 8 | 11
Number of Loans 90 Days or More | loan | 23 | 19
Number of Loans Total Past Due | loan | 50 | 50
Principal Balance Total Past Due | $ 7,574 | $ 8,601
Current | 620,774 | 630,005
Loans and Leases Receivable, Gross | 628,348 | 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 | 20 | 21
Number of Loans 60-89 Days | loan | 12 | 11
Number of Loans 90 Days or More | loan | 26 | 20
Number of Loans Total Past Due | loan | 58 | 52
Principal Balance Total Past Due | $ 3,861 | $ 3,767
Current | 944,715 | 924,036
Loans and Leases Receivable, Gross | 948,576 | 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 | 243 | 297
Number of Loans 60-89 Days | loan | 16 | 12
Number of Loans 90 Days or More | loan | 16 | 13
Number of Loans Total Past Due | loan | 275 | 322
Principal Balance Total Past Due | $ 285 | $ 321
Current | 16,143 | 14,667
Loans and Leases Receivable, Gross | 16,428 | 14,988
Recorded Investment >90 Days and Accruing | 1 | 0
Financing Receivables, 30 to 59 Days Past Due [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 10,972 | 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 | 243 | 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 | 6,360 | 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 | 26 | 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 | 2,763 | 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 | 1,371 | 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 | 209 | 231
Financing Receivables, 60 to 89 Days Past Due [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 3,321 | 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 | 0 | 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 | 1,576 | 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 | 68 | 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 | 1,172 | 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 | 478 | 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 | 27 | 65
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Age Analysis of Past Due Financing Receivables |  |
Principal Balance Total Past Due | 12,651 | 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 | 2,645 | 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 | 4,120 | 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 | 186 | 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 | 3,639 | 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 | 2,012 | 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 | $ 49 | $ 25

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