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Age Analysis of Past Due Financing receivables (Details) $ in Thousands | Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($)
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Age Analysis of Past Due Financing Receivables |  |  |  |
Number of Loans 30-59 Days | loan | 400 | 319 |  |
Number of Loans 60-89 Days | loan | 56 | 48 |  |
Number of Loans 90 Days or More | loan | 110 | 92 |  |
Number of Loans Total Past Due | loan | 566 | 459 |  |
Principal Balance Total Past Due | $ 46,348 | $ 48,746 |  |
Current | 6,859,846 | 6,306,807 |  |
Total loans | 6,906,194 | 6,355,553 | $ 5,999,605 | [1]
Recorded Investment >90 Days and Accruing | $ 5 | $ 8 |  |
Commercial and Industrial [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Number of Loans 30-59 Days | loan | 0 | 2 |  |
Number of Loans 60-89 Days | loan | 4 | 2 |  |
Number of Loans 90 Days or More | loan | 11 | 14 |  |
Number of Loans Total Past Due | loan | 15 | 18 |  |
Principal Balance Total Past Due | $ 26,693 | $ 32,572 |  |
Current | 1,066,936 | 855,956 |  |
Total loans | 1,093,629 | 888,528 | 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 | 9 | 7 |  |
Number of Loans 60-89 Days | loan | 0 | 0 |  |
Number of Loans 90 Days or More | loan | 8 | 9 |  |
Number of Loans Total Past Due | loan | 17 | 16 |  |
Principal Balance Total Past Due | $ 3,877 | $ 4,853 |  |
Current | 3,247,371 | 3,111,708 |  |
Total loans | 3,251,248 | 3,116,561 | 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 | 1 | 0 |  |
Number of Loans Total Past Due | loan | 2 | 0 |  |
Principal Balance Total Past Due | $ 1,582 | $ 0 |  |
Current | 363,583 | 401,797 |  |
Total loans | 365,165 | 401,797 | 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 | 15 | 17 |  |
Number of Loans 60-89 Days | loan | 19 | 11 |  |
Number of Loans 90 Days or More | loan | 24 | 10 |  |
Number of Loans Total Past Due | loan | 58 | 38 |  |
Principal Balance Total Past Due | $ 755 | $ 540 |  |
Current | 163,921 | 131,830 |  |
Total loans | 164,676 | 132,370 | 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 | 23 | 6 |  |
Number of Loans 60-89 Days | loan | 6 | 13 |  |
Number of Loans 90 Days or More | loan | 25 | 22 |  |
Number of Loans Total Past Due | loan | 54 | 41 |  |
Principal Balance Total Past Due | $ 8,389 | $ 6,726 |  |
Current | 914,905 | 747,603 |  |
Total loans | 923,294 | 754,329 | 644,426 |
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 | 22 |  |
Number of Loans 60-89 Days | loan | 12 | 6 |  |
Number of Loans 90 Days or More | loan | 29 | 20 |  |
Number of Loans Total Past Due | loan | 63 | 48 |  |
Principal Balance Total Past Due | $ 4,849 | $ 3,786 |  |
Current | 1,087,235 | 1,048,302 |  |
Total loans | 1,092,084 | 1,052,088 | 988,147 |
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 | 330 | 265 |  |
Number of Loans 60-89 Days | loan | 15 | 16 |  |
Number of Loans 90 Days or More | loan | 12 | 17 |  |
Number of Loans Total Past Due | loan | 357 | 298 |  |
Principal Balance Total Past Due | $ 203 | $ 269 |  |
Current | 15,895 | 9,611 |  |
Total loans | 16,098 | 9,880 | $ 11,064 |
Recorded Investment >90 Days and Accruing | 5 | 8 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 8,402 | 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 | 0 | 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 | 1,627 | 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 | 1,271 | 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 | 506 | 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 | 3,486 | 870 |  |
Financing Receivables, 30 to 59 Days Past Due [Member] | Home Equity [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 1,331 | 1,310 |  |
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 | 181 | 197 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 1,854 | 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 | 382 | 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 | 0 | 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 | 87 | 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 | 521 | 2,385 |  |
Financing Receivables, 60 to 89 Days Past Due [Member] | Home Equity [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 855 | 451 |  |
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 | 9 | 27 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 36,092 | 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 | 26,311 | 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 | 2,250 | 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 | 311 | 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 | 162 | 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 | 4,382 | 3,471 |  |
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 | 2,663 | 2,025 |  |
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 | $ 13 | $ 45 |  |
[1] | The amount of net deferred costs on originated loans included in the ending balance was $7.1 million, $6.1 million and $5.1 million at December 31, 2018, 2017 and 2016, respectively. Net unamortized discounts on acquired loans not deemed to be PCI included in the ending balance were $15.2 million, $9.4 million and $8.6 million at December 31, 2018, 2017 and 2016, respectively.

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