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Loans - Categories (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	$ 2,880,597		$ 2,997,967
Net deferred loan origination costs and premiums and discounts on purchased loans and other	55,551		61,264
Total loans	2,936,148		3,059,231
Allowance for loan losses	(28,000)	$ (28,066)	(29,484)	$ (26,917)	$ (24,465)	$ (21,840)
Net loans	2,908,148		3,029,747
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	(2,026)	(1,902)	(1,146)	(1,151)	(1,477)	(1,521)
Owner-occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	(993)	(1,021)	(1,082)	(1,013)	(846)	(561)
Investor commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	(325)	(329)	(155)	(130)	(130)	(109)
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	(1,327)	(1,357)	(1,192)	(876)	(721)	(380)
Single tenant lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	(11,053)	(11,205)	(12,990)	(12,035)	(11,318)	(11,175)
Public finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	(1,732)	(1,700)	(1,732)	(1,733)	(1,542)	(1,580)
Healthcare finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	(6,354)	(6,938)	(7,485)	(6,081)	(4,762)	(3,247)
Franchise finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	(310)	0	0
Small business lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	(1,214)	(783)	(628)	(484)	(251)	(54)
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	(616)	(594)	(519)	(565)	(539)	(657)
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	(65)	(63)	(48)	(53)	(51)	(46)
Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	(1,985)	$ (2,174)	(2,507)	$ (2,796)	$ (2,828)	$ (2,510)
Commercial Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	2,405,491		2,515,631
Commercial Portfolio Segment | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	107,142		75,387
Commercial Portfolio Segment | Owner-occupied commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	84,819		89,785
Commercial Portfolio Segment | Investor commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	28,505		13,902
Commercial Portfolio Segment | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	115,414		110,385
Commercial Portfolio Segment | Single tenant lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	921,998		950,172
Commercial Portfolio Segment | Public finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	601,738		622,257
Commercial Portfolio Segment | Healthcare finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	417,388		528,154
Commercial Portfolio Segment | Franchise finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	25,598		0
Commercial Portfolio Segment | Small business lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	102,889		125,589
Consumer Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	475,106		482,336
Consumer Portfolio | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	188,750		186,787
Consumer Portfolio | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	17,960		19,857
Consumer Portfolio | Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	268,396		275,692
Interest rate swaps | Commercial Portfolio Segment | Public finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total commercial loans	$ 38,900		$ 42,700

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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