Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	$ 2,909,342	$ 2,919,981
Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	2,386,342	2,286,517
Commercial Portfolio Segment | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	2,361,027	2,260,087
Commercial Portfolio Segment | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	15,937	15,186
Commercial Portfolio Segment | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	9,378	11,244
Commercial Portfolio Segment | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	81,687	96,420
Commercial Portfolio Segment | Commercial and industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	77,447	89,818
Commercial Portfolio Segment | Commercial and industrial | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	3,465	3,973
Commercial Portfolio Segment | Commercial and industrial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	775	2,629
Commercial Portfolio Segment | Owner-occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	86,897	86,726
Commercial Portfolio Segment | Owner-occupied commercial real estate | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	80,389	79,329
Commercial Portfolio Segment | Owner-occupied commercial real estate | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	2,585	3,462
Commercial Portfolio Segment | Owner-occupied commercial real estate | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	3,923	3,935
Commercial Portfolio Segment | Investor commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	13,286	12,567
Commercial Portfolio Segment | Investor commercial real estate | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	13,286	12,567
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	77,591	60,274
Commercial Portfolio Segment | Construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	77,591	60,274
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	980,292	995,879
Commercial Portfolio Segment | Single tenant lease financing | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	966,782	983,448
Commercial Portfolio Segment | Single tenant lease financing | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	8,830	7,751
Commercial Portfolio Segment | Single tenant lease financing | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	4,680	4,680
Commercial Portfolio Segment | Public finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	647,107	687,094
Commercial Portfolio Segment | Public finance | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	647,107	687,094
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	380,956	300,612
Commercial Portfolio Segment | Healthcare finance | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	379,899	300,612
Commercial Portfolio Segment | Healthcare finance | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	1,057	0
Commercial Portfolio Segment | Healthcare finance | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial Portfolio Segment | Small business lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	118,526	46,945
Commercial Portfolio Segment | Small business lending | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	118,526	46,945
Commercial Portfolio Segment | Small business lending | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	0
Commercial Portfolio Segment | Small business lending | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	$ 0	$ 0