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Loans and Allowance for Credit Losses - Schedule of Loans by Class (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Loans, at amortized cost | $ 2,255,645 |  |  | $ 2,088,556 |
Allowance for credit losses on loans | (23,023) | [1] | $ (22,113) | (22,874) | [1]
Loans, net of allowance for credit losses | 2,232,622 |  |  | 2,065,682 |
Deferred loan fees | (901) |  |  | (4,100) |
Unrecognized purchase discounts on non-PCI loans | 2,500 |  |  | 815 |
Financing receivable, accrued interest, net | 7,100 |  |  | 8,800 |
Commercial | Commercial and industrial |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Loans, at amortized cost | 301,602 |  |  | 498,408 |
Allowance for credit losses on loans | (1,709) |  | (2,525) | (2,530) |
Commercial real estate | Commercial real estate, owner-occupied |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Loans, at amortized cost | 392,345 |  |  | 304,963 |
Allowance for credit losses on loans | (2,776) |  | (3,135) | (2,778) |
Commercial real estate | Commercial real estate, investor-owned |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Loans, at amortized cost | 1,189,021 |  |  | 961,208 |
Allowance for credit losses on loans | (12,739) |  | (11,624) | (12,682) |
Commercial real estate | Construction |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Loans, at amortized cost | 119,840 |  |  | 73,046 |
Allowance for credit losses on loans | (1,653) |  | (860) | (1,557) |
Residential loans | Home equity |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Loans, at amortized cost | 88,746 |  |  | 104,813 |
Allowance for credit losses on loans | (595) |  | (1,038) | (738) |
Residential loans | Other residential |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Loans, at amortized cost | 114,558 |  |  | 123,395 |
Allowance for credit losses on loans | (644) |  | (1,260) | (998) |
Consumer loans | Installment and other consumer |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |
Loans, at amortized cost | 49,533 |  |  | 22,723 |
Allowance for credit losses on loans | $ (621) |  | $ (406) | $ (291) |
[1] | Refer to Note 1, Summary of Accounting Policies, for information on the adoption of ASU 2016-13 in 2020.

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