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Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	$ 2,488,489	$ 2,086,429
Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	1,826,635	1,528,407
Commercial Portfolio Segment | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	1,808,175	1,509,542
Commercial Portfolio Segment | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	9,032	14,961
Commercial Portfolio Segment | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	9,428	3,904
Commercial Portfolio Segment | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	105,489	122,940
Commercial Portfolio Segment | Commercial and industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	95,573	113,840
Commercial Portfolio Segment | Commercial and industrial | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	1,967	5,203
Commercial Portfolio Segment | Commercial and industrial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	7,949	3,897
Commercial Portfolio Segment | Owner-occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	93,568	75,768
Commercial Portfolio Segment | Owner-occupied commercial real estate | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	90,571	72,995
Commercial Portfolio Segment | Owner-occupied commercial real estate | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	1,518	2,766
Commercial Portfolio Segment | Owner-occupied commercial real estate | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	1,479	7
Commercial Portfolio Segment | Investor commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	5,595	7,273
Commercial Portfolio Segment | Investor commercial real estate | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	5,595	7,273
Commercial Portfolio Segment | Investor commercial real estate | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial Portfolio Segment | Investor commercial real estate | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial Portfolio Segment | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	38,228	49,213
Commercial Portfolio Segment | Construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	38,228	49,213
Commercial Portfolio Segment | Construction | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial Portfolio Segment | Construction | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial Portfolio Segment | Single tenant lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	883,372	803,299
Commercial Portfolio Segment | Single tenant lease financing | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	877,825	796,307
Commercial Portfolio Segment | Single tenant lease financing | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	5,547	6,992
Commercial Portfolio Segment | Single tenant lease financing | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial Portfolio Segment | Public finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	610,858	438,341
Commercial Portfolio Segment | Public finance | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	610,858	438,341
Commercial Portfolio Segment | Public finance | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial Portfolio Segment | Public finance | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial Portfolio Segment | Healthcare finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	89,525	31,573
Commercial Portfolio Segment | Healthcare finance | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	89,525	31,573
Commercial Portfolio Segment | Healthcare finance | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial Portfolio Segment | Healthcare finance | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	$ 0	$ 0

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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