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Age Analysis of Past Due Financing receivables (Details) $ in Thousands | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($)
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Age Analysis of Past Due Financing Receivables |  |  |  |
Number of Loans 30-59 Days | loan | 447 | 400 |  |
Number of Loans 60-89 Days | loan | 43 | 56 |  |
Number of Loans 90 Days or More | loan | 113 | 110 |  |
Number of Loans Total Past Due | loan | 603 | 566 |  |
Principal Balance Total Past Due | $ 25,485 | $ 46,348 |  |
Current | 8,848,154 | 6,859,846 |  |
Total loans | 8,873,639 | 6,906,194 | $ 6,355,553 | [1]
Recorded Investment >90 Days and Accruing | $ 2,157 | $ 5 |  |
Commercial and Industrial [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Number of Loans 30-59 Days | loan | 1 | 0 |  |
Number of Loans 60-89 Days | loan | 2 | 4 |  |
Number of Loans 90 Days or More | loan | 5 | 11 |  |
Number of Loans Total Past Due | loan | 8 | 15 |  |
Principal Balance Total Past Due | $ 1,336 | $ 26,693 |  |
Current | 1,393,700 | 1,066,936 |  |
Total loans | 1,395,036 | 1,093,629 | 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 | 9 |  |
Number of Loans 60-89 Days | loan | 1 | 0 |  |
Number of Loans 90 Days or More | loan | 8 | 8 |  |
Number of Loans Total Past Due | loan | 16 | 17 |  |
Principal Balance Total Past Due | $ 3,922 | $ 3,877 |  |
Current | 3,998,437 | 3,247,371 |  |
Total loans | 4,002,359 | 3,251,248 | 3,116,561 |
Recorded Investment >90 Days and Accruing | $ 218 | $ 0 |  |
Construction Loans [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Number of Loans 30-59 Days | loan | 1 | 1 |  |
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 | 1 | 2 |  |
Principal Balance Total Past Due | $ 560 | $ 1,582 |  |
Current | 546,733 | 363,583 |  |
Total loans | 547,293 | 365,165 | 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 | 11 | 15 |  |
Number of Loans 60-89 Days | loan | 3 | 19 |  |
Number of Loans 90 Days or More | loan | 6 | 24 |  |
Number of Loans Total Past Due | loan | 20 | 58 |  |
Principal Balance Total Past Due | $ 967 | $ 755 |  |
Current | 173,530 | 163,921 |  |
Total loans | 174,497 | 164,676 | 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 | 17 | 23 |  |
Number of Loans 60-89 Days | loan | 17 | 6 |  |
Number of Loans 90 Days or More | loan | 38 | 25 |  |
Number of Loans Total Past Due | loan | 72 | 54 |  |
Principal Balance Total Past Due | $ 12,312 | $ 8,389 |  |
Current | 1,578,257 | 914,905 |  |
Total loans | 1,590,569 | 923,294 | 754,329 |
Recorded Investment >90 Days and Accruing | $ 1,652 | $ 0 |  |
Home Equity [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Number of Loans 30-59 Days | loan | 23 | 22 |  |
Number of Loans 60-89 Days | loan | 8 | 12 |  |
Number of Loans 90 Days or More | loan | 40 | 29 |  |
Number of Loans Total Past Due | loan | 71 | 63 |  |
Principal Balance Total Past Due | $ 6,067 | $ 4,849 |  |
Current | 1,127,731 | 1,087,235 |  |
Total loans | 1,133,798 | 1,092,084 | 1,052,088 |
Recorded Investment >90 Days and Accruing | $ 265 | $ 0 |  |
Consumer Portfolio Segment [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Number of Loans 30-59 Days | loan | 387 | 330 |  |
Number of Loans 60-89 Days | loan | 12 | 15 |  |
Number of Loans 90 Days or More | loan | 16 | 12 |  |
Number of Loans Total Past Due | loan | 415 | 357 |  |
Principal Balance Total Past Due | $ 321 | $ 203 |  |
Current | 29,766 | 15,895 |  |
Total loans | 30,087 | 16,098 | $ 9,880 |
Recorded Investment >90 Days and Accruing | 22 | 5 |  |
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 7,511 | 8,402 |  |
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial and Industrial [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 253 | 0 |  |
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 1,690 | 1,627 |  |
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Loans [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 560 | 1,271 |  |
Financial Asset, 30 to 59 Days Past Due [Member] | Small Business [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 837 | 506 |  |
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Real Estate [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 2,237 | 3,486 |  |
Financial Asset, 30 to 59 Days Past Due [Member] | Home Equity [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 1,689 | 1,331 |  |
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 245 | 181 |  |
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 4,155 | 1,854 |  |
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial and Industrial [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 323 | 382 |  |
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 194 | 0 |  |
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Loans [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 0 | 0 |  |
Financial Asset, 60 to 89 Days Past Due [Member] | Small Business [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 15 | 87 |  |
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Real Estate [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 3,055 | 521 |  |
Financial Asset, 60 to 89 Days Past Due [Member] | Home Equity [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 524 | 855 |  |
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 44 | 9 |  |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 13,819 | 36,092 |  |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 760 | 26,311 |  |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 2,038 | 2,250 |  |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Loans [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 0 | 311 |  |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Small Business [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 115 | 162 |  |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Real Estate [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 7,020 | 4,382 |  |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Home Equity [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | 3,854 | 2,663 |  |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | $ 32 | $ 13 |  |
[1] | The amount of net deferred costs on originated loans included in the ending balance was $7.1 million, at December 31, 2019 and 2018 and $6.1 million and at December 31, 2017. Net unamortized discounts on acquired loans not deemed to be PCI included in the ending balance were $21.6 million, $15.2 million and $9.4 million at December 31, 2019, 2018 and 2017, respectively.

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