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Loans, Allowance for Loan Losses and Credit Quality (Age Analysis of Past Due Financing Receivables) (Details) $ in Thousands | Sep. 30, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan
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Age Analysis of Past Due Financing Receivables |  |  |  |
Number of Loans 30-59 Days | loan |  | 371 |  | 400
Number of Loans 60-89 Days | loan |  | 31 |  | 56
Number of Loans 90 Days or More | loan |  | 106 |  | 110
Number of Loans Total Past Due | loan |  | 508 |  | 566
Principal Balance Total Past Due |  | $ 23,441 |  | $ 46,348
Current |  | 8,890,060 |  | 6,859,846
Total loans | [1] | 8,913,501 |  | 6,906,194
Recorded Investment >90 Days and Accruing |  | $ 2,342 |  | $ 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 |  | 3 |  | 11
Number of Loans Total Past Due | loan |  | 6 |  | 15
Principal Balance Total Past Due |  | $ 417 |  | $ 26,693
Current |  | 1,411,099 |  | 1,066,936
Total loans | [1] | 1,411,516 |  | 1,093,629
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 |  | 6 |  | 9
Number of Loans 60-89 Days | loan |  | 2 |  | 0
Number of Loans 90 Days or More | loan |  | 4 |  | 8
Number of Loans Total Past Due | loan |  | 12 |  | 17
Principal Balance Total Past Due |  | $ 2,900 |  | $ 3,877
Current |  | 3,997,587 |  | 3,247,371
Total loans | [1] | 4,000,487 |  | 3,251,248
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 |  | 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 |  | 0 |  | 2
Principal Balance Total Past Due |  | $ 0 |  | $ 1,582
Current |  | 520,585 |  | 363,583
Total loans | [1] | 520,585 |  | 365,165
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 |  | 15
Number of Loans 60-89 Days | loan |  | 5 |  | 19
Number of Loans 90 Days or More | loan |  | 7 |  | 24
Number of Loans Total Past Due | loan |  | 22 |  | 58
Principal Balance Total Past Due |  | $ 674 |  | $ 755
Current |  | 171,364 |  | 163,921
Total loans | [1] | 172,038 |  | 164,676
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 |  | 24 |  | 23
Number of Loans 60-89 Days | loan |  | 6 |  | 6
Number of Loans 90 Days or More | loan |  | 40 |  | 25
Number of Loans Total Past Due | loan |  | 70 |  | 54
Principal Balance Total Past Due |  | $ 12,841 |  | $ 8,389
Current |  | 1,631,917 |  | 914,905
Total loans | [1] | 1,644,758 |  | 923,294
Recorded Investment >90 Days and Accruing |  | $ 1,807 | [2] | $ 0
Consumer 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 |  | 36 |  | 29
Number of Loans Total Past Due | loan |  | 67 |  | 63
Principal Balance Total Past Due |  | $ 6,270 |  | $ 4,849
Current |  | 1,130,839 |  | 1,087,235
Total loans | [1] | 1,137,109 |  | 1,092,084
Recorded Investment >90 Days and Accruing |  | $ 511 | [2] | $ 0
Consumer - Other [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Number of Loans 30-59 Days | loan | [3] | 307 |  | 330
Number of Loans 60-89 Days | loan | [3] | 8 |  | 15
Number of Loans 90 Days or More | loan | [3] | 16 |  | 12
Number of Loans Total Past Due | loan | [3] | 331 |  | 357
Principal Balance Total Past Due | [3] | $ 339 |  | $ 203
Current | [3] | 26,669 |  | 15,895
Total loans | [1],[3] | 27,008 |  | 16,098
Recorded Investment >90 Days and Accruing | [3] | 24 |  | 5
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due |  | 7,708 |  | 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 |  | 278 |  | 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 |  | 1,641 |  | 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 |  | 0 |  | 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 |  | 315 |  | 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 |  | 3,267 |  | 3,486
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Home Equity [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due |  | 1,974 |  | 1,331
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer - Other [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | [3] | 233 |  | 181
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due |  | 2,881 |  | 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 |  | 100 |  | 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 |  | 238 |  | 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 |  | 260 |  | 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 |  | 1,257 |  | 521
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Home Equity [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due |  | 982 |  | 855
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer - Other [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | [3] | 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 |  | 12,852 |  | 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 |  | 39 |  | 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 |  | 1,021 |  | 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 |  | 99 |  | 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 |  | 8,317 |  | 4,382
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Home Equity [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due |  | 3,314 |  | 2,663
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer - Other [Member] |  |  |  |
Age Analysis of Past Due Financing Receivables |  |  |  |
Principal Balance Total Past Due | [3] | $ 62 |  | $ 13
[1] | The amount of net deferred costs on originated loans included in the ending balance was $7.2 million and $7.1 million at September 30, 2019 and December 31, 2018, respectively. Net unamortized discounts on acquired loans not deemed to be purchased credit impaired ("PCI") included in the ending balance was $24.7 million and $15.2 million at September 30, 2019 and December 31, 2018, respectively.
[2] | (1) Represents purchased credit impaired loans that are accruing interest due to expectations of future cash collections.
[3] | (2) Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.

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