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Age Analysis of Past Due Financing receivables (Details) $ in Thousands | Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($) loan | Dec. 31, 2015 USD ($)
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Age Analysis of Past Due Financing Receivables |  |  |  |
Number of Loans 30-59 Days | loan | 319 | 301 |  |
Number of Loans 60-89 Days | loan | 48 | 72 |  |
Number of Loans 90 Days or More | loan | 92 | 91 |  |
Number of Loans Total Past Due | loan | 459 | 464 |  |
Principal Balance Total Past Due | $ 48,746 | $ 19,911 |  |
Current | 6,306,807 | 5,979,694 |  |
Total loans | 6,355,553 | 5,999,605 | $ 5,547,721 | [1]
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 | 2 | 8 |  |
Number of Loans 60-89 Days | loan | 2 | 32 |  |
Number of Loans 90 Days or More | loan | 14 | 6 |  |
Number of Loans Total Past Due | loan | 18 | 46 |  |
Principal Balance Total Past Due | $ 32,572 | $ 2,833 |  |
Current | 855,956 | 899,220 |  |
Total loans | 888,528 | 902,053 | 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 | 7 | 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 | 16 | 21 |  |
Principal Balance Total Past Due | $ 4,853 | $ 6,580 |  |
Current | 3,111,708 | 3,004,218 |  |
Total loans | 3,116,561 | 3,010,798 | 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 | 0 |  |
Number of Loans Total Past Due | loan | 0 | 0 |  |
Principal Balance Total Past Due | $ 0 | $ 0 |  |
Current | 401,797 | 320,391 |  |
Total loans | 401,797 | 320,391 | 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 | 17 | 9 |  |
Number of Loans 60-89 Days | loan | 11 | 0 |  |
Number of Loans 90 Days or More | loan | 10 | 19 |  |
Number of Loans Total Past Due | loan | 38 | 28 |  |
Principal Balance Total Past Due | $ 540 | $ 463 |  |
Current | 131,830 | 122,263 |  |
Total loans | 132,370 | 122,726 | 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 | 6 | 11 |  |
Number of Loans 60-89 Days | loan | 13 | 9 |  |
Number of Loans 90 Days or More | loan | 22 | 27 |  |
Number of Loans Total Past Due | loan | 41 | 47 |  |
Principal Balance Total Past Due | $ 6,726 | $ 6,734 |  |
Current | 747,603 | 637,692 |  |
Total loans | 754,329 | 644,426 | 638,606 |
Recorded Investment >90 Days and Accruing | $ 0 | $ 0 |  |
Home Equity [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Number of Loans 30-59 Days | loan | 22 | 19 |  |
Number of Loans 60-89 Days | loan | 6 | 11 |  |
Number of Loans 90 Days or More | loan | 20 | 16 |  |
Number of Loans Total Past Due | loan | 48 | 46 |  |
Principal Balance Total Past Due | $ 3,786 | $ 3,093 |  |
Current | 1,048,302 | 985,054 |  |
Total loans | 1,052,088 | 988,147 | 927,803 |
Recorded Investment >90 Days and Accruing | $ 0 | $ 0 |  |
Consumer Portfolio Segment [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Number of Loans 30-59 Days | loan | 265 | 249 |  |
Number of Loans 60-89 Days | loan | 16 | 12 |  |
Number of Loans 90 Days or More | loan | 17 | 15 |  |
Number of Loans Total Past Due | loan | 298 | 276 |  |
Principal Balance Total Past Due | $ 269 | $ 208 |  |
Current | 9,611 | 10,856 |  |
Total loans | 9,880 | 11,064 | $ 14,988 |
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 | 5,971 | 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 | 195 | 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 | 3,060 | 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 | 339 | 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 | 870 | 1,277 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | Home Equity [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 1,310 | 1,117 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 197 | 184 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 3,377 | 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 | 370 | 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 | 144 | 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 | 2,385 | 1,950 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | Home Equity [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 451 | 767 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 27 | 17 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 39,398 | 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 | 32,007 | 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 | 1,793 | 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 | 57 | 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 | 3,471 | 3,507 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Home Equity [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 2,025 | 1,209 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | $ 45 | $ 7 |  |
[1] | The amount of net deferred costs on originated loans included in the ending balance was $6.1 million, $5.1 million, and $4.3 million at December 31, 2017, 2016, and 2015, respectively. Net unamortized discounts on acquired loans not deemed to be PCI included in the ending balance was $9.4 million, $8.6 million, and $6.6 million at December 31, 2017, 2016, and 2015, respectively.

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