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Loans - Loan Portfolio Aging (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | $ 545 | $ 1,091
Current | 2,487,944 | 2,085,338
Total Loans Receivable | 2,488,489 | 2,086,429
Total Loans 90 Days or More Past Due and Accruing | 16 | 0
Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans 90 Days or More Past Due and Accruing | 0 | 0
Owner-occupied commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans 90 Days or More Past Due and Accruing | 0 | 0
Investor commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans 90 Days or More Past Due and Accruing | 0 | 0
Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans 90 Days or More Past Due and Accruing | 0 | 0
Single tenant lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans 90 Days or More Past Due and Accruing | 0 | 0
Public finance |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans 90 Days or More Past Due and Accruing | 0 | 0
Healthcare finance |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans 90 Days or More Past Due and Accruing | 0 | 0
Residential mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans 90 Days or More Past Due and Accruing | 0 | 0
Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans 90 Days or More Past Due and Accruing | 0 | 0
Other consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans 90 Days or More Past Due and Accruing | 16 | 0
30-59 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 250 | 299
60-89 Days Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 251 | 143
90 Days or More Past Due |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 44 | 649
Commercial Portfolio Segment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 1,826,635 | 1,528,407
Commercial Portfolio Segment | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 10
Current | 105,489 | 122,930
Total Loans Receivable | 105,489 | 122,940
Commercial Portfolio Segment | Owner-occupied commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Current | 93,568 | 75,768
Total Loans Receivable | 93,568 | 75,768
Commercial Portfolio Segment | Investor commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Current | 5,595 | 7,273
Total Loans Receivable | 5,595 | 7,273
Commercial Portfolio Segment | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Current | 38,228 | 49,213
Total Loans Receivable | 38,228 | 49,213
Commercial Portfolio Segment | Single tenant lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Current | 883,372 | 803,299
Total Loans Receivable | 883,372 | 803,299
Commercial Portfolio Segment | Public finance |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Current | 610,858 | 438,341
Total Loans Receivable | 610,858 | 438,341
Commercial Portfolio Segment | Healthcare finance |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Current | 89,525 | 31,573
Total Loans Receivable | 89,525 | 31,573
Commercial Portfolio Segment | 30-59 Days Past Due | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 30-59 Days Past Due | Owner-occupied commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 30-59 Days Past Due | Investor commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 30-59 Days Past Due | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 30-59 Days Past Due | Single tenant lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 30-59 Days Past Due | Public finance |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 30-59 Days Past Due | Healthcare finance |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 60-89 Days Past Due | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 10
Commercial Portfolio Segment | 60-89 Days Past Due | Owner-occupied commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 60-89 Days Past Due | Investor commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 60-89 Days Past Due | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 60-89 Days Past Due | Single tenant lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 60-89 Days Past Due | Public finance |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 60-89 Days Past Due | Healthcare finance |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 90 Days or More Past Due | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 90 Days or More Past Due | Owner-occupied commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 90 Days or More Past Due | Investor commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 90 Days or More Past Due | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 90 Days or More Past Due | Single tenant lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 90 Days or More Past Due | Public finance |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Commercial Portfolio Segment | 90 Days or More Past Due | Healthcare finance |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Consumer Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 661,854 | 558,022
Consumer Portfolio | Residential mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 98 | 583
Current | 362,476 | 299,352
Total Loans Receivable | 362,574 | 299,935
Consumer Portfolio | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 83
Current | 28,713 | 30,471
Total Loans Receivable | 28,713 | 30,554
Consumer Portfolio | Other consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 447 | 415
Current | 270,120 | 227,118
Total Loans Receivable | 270,567 | 227,533
Consumer Portfolio | 30-59 Days Past Due | Residential mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Consumer Portfolio | 30-59 Days Past Due | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Consumer Portfolio | 30-59 Days Past Due | Other consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 250 | 299
Consumer Portfolio | 60-89 Days Past Due | Residential mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 98 | 23
Consumer Portfolio | 60-89 Days Past Due | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 0
Consumer Portfolio | 60-89 Days Past Due | Other consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 153 | 110
Consumer Portfolio | 90 Days or More Past Due | Residential mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 560
Consumer Portfolio | 90 Days or More Past Due | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 0 | 83
Consumer Portfolio | 90 Days or More Past Due | Other consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Past Due | 44 | 6
Nonaccrual |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 240 | 839
Nonaccrual | Commercial Portfolio Segment | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 0 | 0
Nonaccrual | Commercial Portfolio Segment | Owner-occupied commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 0 | 0
Nonaccrual | Commercial Portfolio Segment | Investor commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 0 | 0
Nonaccrual | Commercial Portfolio Segment | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 0 | 0
Nonaccrual | Commercial Portfolio Segment | Single tenant lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 0 | 0
Nonaccrual | Commercial Portfolio Segment | Public finance |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 0 | 0
Nonaccrual | Commercial Portfolio Segment | Healthcare finance |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 0 | 0
Nonaccrual | Consumer Portfolio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 240 | 839
Nonaccrual | Consumer Portfolio | Residential mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 179 | 724
Nonaccrual | Consumer Portfolio | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | 0 | 83
Nonaccrual | Consumer Portfolio | Other consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans Receivable | $ 61 | $ 32

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