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Loans, Allowance for Loan Losses and Credit Quality (Age Analysis of Past Due Financing Receivables) (Details) $ in Thousands | Sep. 30, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan
--- | --- | ---
Age Analysis of Past Due Financing Receivables |  |  |  |
Number of Loans 30-59 Days | loan |  | 317 | 319 |
Number of Loans 60-89 Days | loan |  | 45 | 48 |
Number of Loans 90 Days or More | loan |  | 90 | 92 |
Number of Loans Total Past Due | loan |  | 452 | 459 |
Principal Balance Total Past Due |  | $ 46,117 | $ 48,746 |
Current |  | 6,481,285 | 6,306,807 |
Total loans | [1] | 6,527,402 | 6,355,553 |
Recorded Investment >90 Days and Accruing |  | $ 9 | $ 8 |
Commercial and Industrial [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Number of Loans 30-59 Days | loan |  | 3 | 2 |
Number of Loans 60-89 Days | loan |  | 5 | 2 |
Number of Loans 90 Days or More | loan |  | 10 | 14 |
Number of Loans Total Past Due | loan |  | 18 | 18 |
Principal Balance Total Past Due |  | $ 29,390 | $ 32,572 |
Current |  | 974,390 | 855,956 |
Total loans | [1] | 1,003,780 | 888,528 |
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 |  | 7 | 7 |
Number of Loans 60-89 Days | loan |  | 5 | 0 |
Number of Loans 90 Days or More | loan |  | 6 | 9 |
Number of Loans Total Past Due | loan |  | 18 | 16 |
Principal Balance Total Past Due |  | $ 4,467 | $ 4,853 |
Current |  | 3,128,024 | 3,111,708 |
Total loans | [1] | 3,132,491 | 3,116,561 |
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 |  | 352,491 | 401,797 |
Total loans | [1] | 352,491 | 401,797 |
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 | 17 |
Number of Loans 60-89 Days | loan |  | 6 | 11 |
Number of Loans 90 Days or More | loan |  | 17 | 10 |
Number of Loans Total Past Due | loan |  | 32 | 38 |
Principal Balance Total Past Due |  | $ 682 | $ 540 |
Current |  | 148,518 | 131,830 |
Total loans | [1] | 149,200 | 132,370 |
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 |  | 10 | 6 |
Number of Loans 60-89 Days | loan |  | 12 | 13 |
Number of Loans 90 Days or More | loan |  | 19 | 22 |
Number of Loans Total Past Due | loan |  | 41 | 41 |
Principal Balance Total Past Due |  | $ 6,863 | $ 6,726 |
Current |  | 794,947 | 747,603 |
Total loans | [1] | 801,810 | 754,329 |
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 |  | 16 | 22 |
Number of Loans 60-89 Days | loan |  | 9 | 6 |
Number of Loans 90 Days or More | loan |  | 25 | 20 |
Number of Loans Total Past Due | loan |  | 50 | 48 |
Principal Balance Total Past Due |  | $ 4,531 | $ 3,786 |
Current |  | 1,069,430 | 1,048,302 |
Total loans | [1] | 1,073,961 | 1,052,088 |
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 |  | 272 | 265 | [2]
Number of Loans 60-89 Days | loan |  | 8 | 16 | [2]
Number of Loans 90 Days or More | loan |  | 13 | 17 | [2]
Number of Loans Total Past Due | loan |  | 293 | 298 | [2]
Principal Balance Total Past Due |  | $ 184 | $ 269 | [2]
Current |  | 13,485 | 9,611 | [2]
Total loans | [1] | 13,669 | 9,880 | [2]
Recorded Investment >90 Days and Accruing |  | 9 | 8 |
Financing Receivables, 30 to 59 Days Past Due [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due |  | 5,092 | 5,971 |
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 |  | 265 | 195 |
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 |  | 2,188 | 3,060 |
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 |  | 483 | 339 |
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 |  | 1,129 | 870 |
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 |  | 909 | 1,310 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer - Other [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due |  | 118 | 197 | [2]
Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due |  | 4,524 | 3,377 |
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 |  | 431 | 370 |
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 |  | 849 | 0 |
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 |  | 60 | 144 |
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 |  | 2,367 | 2,385 |
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 |  | 797 | 451 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer - Other [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due |  | 20 | 27 | [2]
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due |  | 36,501 | 39,398 |
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 |  | 28,694 | 32,007 |
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 |  | 1,430 | 1,793 |
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 |  | 139 | 57 |
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 |  | 3,367 | 3,471 |
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 |  | 2,825 | 2,025 |
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 |  | $ 46 | $ 45 | [2]
[1] | The amount of net deferred costs on originated loans included in the ending balance was $6.9 million and $6.1 million at September 30, 2018 and December 31, 2017, respectively. Net unamortized discounts on acquired loans not deemed to be purchased credit impaired ("PCI") included in the ending balance was $8.6 million and $9.4 million at September 30, 2018 and December 31, 2017, respectively.
[2] | (1) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

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