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Loans Receivable and Allowance for Credit Losses - Narrative (Details) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) loan | Sep. 30, 2023 USD ($) loan | Sep. 30, 2024 USD ($) loan | Sep. 30, 2023 USD ($) loan | Dec. 31, 2023 USD ($) | Dec. 31, 2022 | Oct. 01, 2021 | Jan. 01, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans purchased |  |  | $ 127,000 | $ 19,751,000 |  |  |  |
Loans receivable, gross | $ 755,671,000 |  | $ 755,671,000 |  | $ 848,859,000 |  |  |
Maximum period of credit extension |  |  | 18 months |  |  |  |  |
Loans receivable, term to reset to FHLB rate |  |  | 5 years |  |  |  |  |
Transfers of loans receivable to loans held for sale |  |  | $ 4,339,000 | 0 |  |  |  |
Period for charged off of open-end credits |  |  | 180 days |  |  |  |  |
Period for charged off of close-end credits |  |  | 90 days |  |  |  |  |
Maximum period for charged off of consumer installment loans |  |  | 120 days |  |  |  |  |
Maximum period for charge off, open ended consumer credit |  |  | 180 days |  |  |  |  |
Interest lost on nonaccrual loans, impaired loans | 894,000 | $ 328,000 | $ 2,200,000 | 605,000 |  |  |  |
Interest lost on nonaccrual loans | 325,000 | $ 152,000 | 543,000 | $ 396,000 |  |  |  |
Threshold amount for nonaccrual and substandard loans evaluation | $ 100,000 |  | $ 100,000 |  |  |  |  |
Discount to appraisal value | 5.80% |  | 5.80% |  |  |  |  |
Discount of appraisal value, selling costs | 8.00% |  | 8.00% |  |  |  |  |
Number of contract modifications | loan | 0 | 0 | 0 | 0 |  |  |  |
Unfunded Loan Commitment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit loss | $ 177,000 |  | $ 177,000 |  | 271,000 |  |  |
Business Activities Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 755,671,000 |  | 755,671,000 |  | 848,859,000 |  |  |
Business Activities Loans | Performing (Accruing) Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 719,135,000 |  | 719,135,000 |  | 830,732,000 |  |  |
Business Activities Loans | 90 Days or Greater Past Due | Performing (Accruing) Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | $ 3,979,000 |  | $ 3,979,000 |  | 341,000 |  |  |
Exchange percent of principal reduction and cash collateral | 50.00% |  | 50.00% |  |  |  |  |
SBA Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | $ 31,000,000.0 |  | $ 31,000,000.0 |  | 30,000,000.0 |  |  |
Percentage of principal balance guaranteed |  |  |  |  |  | 75.00% | 75.00% | 90.00%
Transfers of loans receivable to loans held for sale | 5,500,000 | $ 0 | 5,500,000 | $ 0 |  |  |  |
SBA CARES Act Paycheck Protection Program |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 130,000 |  | 130,000 |  | 133,000 |  |  |
Syndicated and Leveraged Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 5,700,000 |  | $ 5,700,000 |  | 5,700,000 |  |  |
Commercial Real Estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Maximum percentage of credit extension based on market value of collateral |  |  | 75.00% |  |  |  |  |
Loans purchased | 0 | 0 | $ 0 | 0 |  |  |  |
Loans receivable, gross | 452,155,000 |  | 452,155,000 |  | 472,093,000 |  |  |
Commercial Real Estate | Business Activities Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 452,155,000 |  | 452,155,000 |  | 472,093,000 |  |  |
Commercial Real Estate | Business Activities Loans | Performing (Accruing) Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 423,900,000 |  | 423,900,000 |  | 459,318,000 |  |  |
Commercial Real Estate | Business Activities Loans | 90 Days or Greater Past Due | Performing (Accruing) Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 3,979,000 |  | $ 3,979,000 |  | 0 |  |  |
Multi-family Real Estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Maximum percentage of credit extension based on market value of collateral |  |  | 80.00% |  |  |  |  |
Construction |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of maximum loan to value |  |  | 75.00% |  |  |  |  |
Loans receivable, gross | 3,829,000 |  | $ 3,829,000 |  | 4,266,000 |  |  |
Construction | Business Activities Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 3,829,000 |  | 3,829,000 |  | 4,266,000 |  |  |
Construction | Business Activities Loans | Performing (Accruing) Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 3,829,000 |  | 3,829,000 |  | 3,812,000 |  |  |
Construction | Business Activities Loans | 90 Days or Greater Past Due | Performing (Accruing) Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 0 |  | 0 |  | 0 |  |  |
Residential Real Estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans purchased | 41,000 | 0 | 127,000 | 0 |  |  |  |
Loans receivable, gross | 94,579,000 |  | 94,579,000 |  | 106,783,000 |  |  |
Residential Real Estate | Business Activities Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 94,579,000 |  | 94,579,000 |  | 106,783,000 |  |  |
Residential Real Estate | Business Activities Loans | Performing (Accruing) Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 94,448,000 |  | 94,448,000 |  | 106,783,000 |  |  |
Residential Real Estate | Business Activities Loans | 90 Days or Greater Past Due | Performing (Accruing) Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 0 |  | 0 |  | 0 |  |  |
Consumer and Other |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 68,418,000 |  | 68,418,000 |  | 99,688,000 |  |  |
Consumer and Other | Business Activities Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 68,418,000 |  | 68,418,000 |  | 99,688,000 |  |  |
Consumer and Other | Business Activities Loans | Performing (Accruing) Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 67,022,000 |  | 67,022,000 |  | 98,711,000 |  |  |
Consumer and Other | Business Activities Loans | 90 Days or Greater Past Due | Performing (Accruing) Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 0 |  | $ 0 |  | 341,000 |  |  |
Consumer and Other | Minimum |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable term |  |  | 2 years |  |  |  |  |
Consumer and Other | Maximum |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable term |  |  | 5 years |  |  |  |  |
Consumer and Other | Unsecured Consumer Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 26,100,000 |  | $ 26,100,000 |  | 48,500,000 |  |  |
Consumer and Other | Unsecured Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans purchased | 0 | 1,800,000 | 0 | 15,400,000 |  |  |  |
Consumer and Other | Home equity lines of credit |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans purchased | 0 | $ 1,500,000 | 0 | $ 4,400,000 |  |  |  |
Construction to Permanent - CRE |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 2,357,000 |  | 2,357,000 |  | 2,464,000 |  |  |
Construction to Permanent - CRE | Business Activities Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 2,357,000 |  | 2,357,000 |  | 2,464,000 |  |  |
Construction to Permanent - CRE | Business Activities Loans | Performing (Accruing) Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 0 |  | 0 |  | 2,464,000 |  |  |
Construction to Permanent - CRE | Business Activities Loans | 90 Days or Greater Past Due | Performing (Accruing) Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | $ 0 |  | $ 0 |  | $ 0 |  |  |
Construction to Permanent - CRE | Minimum |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable term |  |  | 20 years |  |  |  |  |
Construction to Permanent - CRE | Maximum |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable term |  |  | 25 years |  |  |  |  |

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