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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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