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Loans and Allowance for Credit Losses - Schedule of Collateral-Dependent Non-Accrual Loans (Details) - USD ($) | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | $ 8,376,000 |  |  | $ 9,233,000 |
Allowance for credit losses on loans | $ 23,023,000 | [1] | $ 22,113,000 | $ 22,874,000 | [1]
Weighted average ratio of loans value to collateral dependent loans value | 67.00% |  |  | 56.00% |
Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | $ 8,376,000 |  |  | $ 17,609,000 |
Allowance for credit losses on loans | 0 |  |  | 0 |
Nonaccrual collateral dependent loans in process of foreclosure | 0 |  |  | 0 |
Commercial Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 7,963,000 |  |  | 16,720,000 |
Residential Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 413,000 |  |  | 872,000 |
Other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 0 |  |  | 17,000 |
Commercial real estate | Commercial real estate, owner-occupied |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 7,269,000 |  |  | 7,147,000 |
Allowance for credit losses on loans | 2,776,000 |  | 3,135,000 | 2,778,000 |
Commercial real estate | Commercial real estate, owner-occupied | Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 7,269,000 |  |  | 7,147,000 |
Allowance for credit losses on loans | 0 |  |  | 0 |
Commercial real estate | Commercial real estate, owner-occupied | Commercial Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 7,269,000 |  |  | 7,147,000 |
Commercial real estate | Commercial real estate, owner-occupied | Residential Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 0 |  |  | 0 |
Commercial real estate | Commercial real estate, owner-occupied | Other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 0 |  |  | 0 |
Commercial real estate | Commercial real estate, investor-owned |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 694,000 |  |  | 1,610,000 |
Allowance for credit losses on loans | 12,739,000 |  | 11,624,000 | 12,682,000 |
Commercial real estate | Commercial real estate, investor-owned | Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 694,000 |  |  | 1,610,000 |
Allowance for credit losses on loans | 0 |  |  | 0 |
Commercial real estate | Commercial real estate, investor-owned | Commercial Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 694,000 |  |  | 1,610,000 |
Commercial real estate | Commercial real estate, investor-owned | Residential Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 0 |  |  | 0 |
Commercial real estate | Commercial real estate, investor-owned | Other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 0 |  |  | 0 |
Residential loans | Home equity |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 413,000 |  |  | 459,000 |
Allowance for credit losses on loans | 595,000 |  | 1,038,000 | 738,000 |
Residential loans | Home equity | Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 413,000 |  |  | 459,000 |
Allowance for credit losses on loans | 0 |  |  | 0 |
Residential loans | Home equity | Commercial Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 0 |  |  | 0 |
Residential loans | Home equity | Residential Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 413,000 |  |  | 459,000 |
Residential loans | Home equity | Other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 0 |  |  | 0 |
Consumer loans | Installment and other consumer |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans | 0 |  |  | 17,000 |
Allowance for credit losses on loans | $ 621,000 |  | $ 406,000 | 291,000 |
Consumer loans | Installment and other consumer | Collateral Pledged |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans |  |  |  | 17,000 |
Allowance for credit losses on loans |  |  |  | 0 |
Consumer loans | Installment and other consumer | Commercial Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans |  |  |  | 0 |
Consumer loans | Installment and other consumer | Residential Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans |  |  |  | 0 |
Consumer loans | Installment and other consumer | Other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-accrual loans |  |  |  | $ 17,000 |
[1] | Refer to Note 1, Summary of Accounting Policies, for information on the adoption of ASU 2016-13 in 2020.

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