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Loans - Loan Portfolio Aging (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	$ 1,844	$ 5,245
Current	2,878,753	2,992,722
Total Loans Receivable	2,880,597	2,997,967
Total Loans 90 Days or More Past Due and Accruing	0	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
Small business lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans 90 Days or More Past Due and Accruing	0	0
Franchise finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans 90 Days or More Past Due and Accruing	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	0	0
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	86	225
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	12	66
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,746	4,954
Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	2,405,491	2,515,631
Commercial Portfolio Segment | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Current	107,142	75,387
Total Loans Receivable	107,142	75,387
Commercial Portfolio Segment | Owner-occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Current	84,819	89,785
Total Loans Receivable	84,819	89,785
Commercial Portfolio Segment | Investor commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Current	28,505	13,902
Total Loans Receivable	28,505	13,902
Commercial Portfolio Segment | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Current	115,414	110,385
Total Loans Receivable	115,414	110,385
Commercial Portfolio Segment | Single tenant lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	4,680
Current	921,998	945,492
Total Loans Receivable	921,998	950,172
Commercial Portfolio Segment | Public finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Current	601,738	622,257
Total Loans Receivable	601,738	622,257
Commercial Portfolio Segment | Healthcare finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Current	417,388	528,154
Total Loans Receivable	417,388	528,154
Commercial Portfolio Segment | Small business lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,351	0
Current	101,538	125,589
Total Loans Receivable	102,889	125,589
Commercial Portfolio Segment | Franchise finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0
Current	25,598
Total Loans Receivable	25,598	0
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 | 30-59 Days Past Due | Small business lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Commercial Portfolio Segment | 30-59 Days Past Due | Franchise finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0
Commercial Portfolio Segment | 60-89 Days Past Due | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
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 | 60-89 Days Past Due | Small business lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Commercial Portfolio Segment | 60-89 Days Past Due | Franchise finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	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	4,680
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
Commercial Portfolio Segment | 90 Days or More Past Due | Small business lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	1,351	0
Commercial Portfolio Segment | 90 Days or More Past Due | Franchise finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0
Consumer Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	475,106	482,336
Consumer Portfolio | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	378	318
Current	188,372	186,469
Total Loans Receivable	188,750	186,787
Consumer Portfolio | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	15
Current	17,960	19,842
Total Loans Receivable	17,960	19,857
Consumer Portfolio | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	115	232
Current	268,281	275,460
Total Loans Receivable	268,396	275,692
Consumer Portfolio | 30-59 Days Past Due | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	49
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	86	176
Consumer Portfolio | 60-89 Days Past Due | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Consumer Portfolio | 60-89 Days Past Due | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	15
Consumer Portfolio | 60-89 Days Past Due | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	12	51
Consumer Portfolio | 90 Days or More Past Due | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	378	269
Consumer Portfolio | 90 Days or More Past Due | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	0	0
Consumer Portfolio | 90 Days or More Past Due | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Past Due	17	5
Nonaccrual
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	7,851	10,183
Nonaccrual | Commercial Portfolio Segment | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	678	0
Nonaccrual | Commercial Portfolio Segment | Owner-occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0	1,838
Nonaccrual | Commercial Portfolio Segment | Investor commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	3,429	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	1,100	7,116
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 | Commercial Portfolio Segment | Small business lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	1,351	0
Nonaccrual | Commercial Portfolio Segment | Franchise finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	0
Nonaccrual | Consumer Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	1,293	1,229
Nonaccrual | Consumer Portfolio | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	1,253	1,183
Nonaccrual | Consumer Portfolio | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	14	0
Nonaccrual | Consumer Portfolio | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans Receivable	$ 26	$ 46

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