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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
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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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