Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	$ 2,901,070	$ 2,997,967
Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	2,434,616	2,515,631
Commercial Portfolio Segment | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	2,387,318	2,481,795
Commercial Portfolio Segment | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	38,052	17,962
Commercial Portfolio Segment | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	9,246	15,874
Commercial Portfolio Segment | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	96,203	75,387
Commercial Portfolio Segment | Commercial and industrial | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	79,928	74,138
Commercial Portfolio Segment | Commercial and industrial | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	15,563	732
Commercial Portfolio Segment | Commercial and industrial | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	712	517
Commercial Portfolio Segment | Owner-occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	87,136	89,785
Commercial Portfolio Segment | Owner-occupied commercial real estate | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	79,730	84,292
Commercial Portfolio Segment | Owner-occupied commercial real estate | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	3,919	3,655
Commercial Portfolio Segment | Owner-occupied commercial real estate | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	3,487	1,838
Commercial Portfolio Segment | Investor commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	28,871	13,902
Commercial Portfolio Segment | Investor commercial real estate | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	28,871	13,902
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	117,970	110,385
Commercial Portfolio Segment | Construction | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	117,970	110,385
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	913,115	950,172
Commercial Portfolio Segment | Single tenant lease financing | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	901,505	932,830
Commercial Portfolio Segment | Single tenant lease financing | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	9,237	10,018
Commercial Portfolio Segment | Single tenant lease financing | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	2,373	7,324
Commercial Portfolio Segment | Public finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	612,138	622,257
Commercial Portfolio Segment | Public finance | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	612,138	622,257
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	455,890	528,154
Commercial Portfolio Segment | Healthcare finance | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	454,312	526,517
Commercial Portfolio Segment | Healthcare finance | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	615	627
Commercial Portfolio Segment | Healthcare finance | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	963	1,010
Commercial Portfolio Segment | Small business lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	123,293	125,589
Commercial Portfolio Segment | Small business lending | Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	112,864	117,474
Commercial Portfolio Segment | Small business lending | Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	8,718	2,930
Commercial Portfolio Segment | Small business lending | Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	$ 1,711	$ 5,185