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Loans Receivable and Allowance for Credit Losses - Narrative (Details) | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) loan | Mar. 31, 2023 USD ($) loan | Dec. 31, 2023 USD ($) | Dec. 31, 2022 | Oct. 01, 2021 | Jan. 01, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans purchased | $ 47,000 | $ 10,623,000 |  |  |  |
Loans receivable, gross | $ 810,323,000 |  | $ 848,859,000 |  |  |
Maximum period of credit extension | 18 months |  |  |  |  |
Loans receivable, term to reset to FHLB rate | 5 years |  |  |  |  |
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 | 180 days |  |  |  |  |
Interest lost on nonaccrual loans, impaired loans | $ 573,000 | 63,000 |  |  |  |
Interest lost on nonaccrual loans | 20,000 | $ 282,000 |  |  |  |
Threshold amount for nonaccrual and substandard loans evaluation | $ 100,000 |  |  |  |  |
Discount to appraisal value | 5.80% |  |  |  |  |
Discount of appraisal value, selling costs | 8.00% |  |  |  |  |
Number of contract modifications | loan | 0 | 0 |  |  |  |
Unfunded Loan Commitment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit loss | $ 276,000 |  | 1,900,000 |  |  |
SBA Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | 35,000,000 |  | 30,000,000 |  |  |
Percentage of principal balance guaranteed |  |  |  | 75.00% | 75.00% | 90.00%
Transfer of loans held-for-sale to portfolio loans | 5,500,000 | $ 0 |  |  |  |
SBA CARES Act Paycheck Protection Program |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | 132,000 |  | 133,000 |  |  |
Syndicated and Leveraged Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 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 |  |  |  |
Loans receivable, gross | $ 462,547,000 |  | 472,093,000 |  |  |
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 | $ 4,239,000 |  | 4,266,000 |  |  |
Residential Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans purchased | 47,000 | 0 |  |  |  |
Loans receivable, gross | 102,881,000 |  | 106,783,000 |  |  |
Consumer and Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 89,772,000 |  | 99,688,000 |  |  |
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 | $ 39,900,000 |  | 48,500,000 |  |  |
Consumer and Other | Unsecured Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans purchased | 0 | 9,300,000 |  |  |  |
Consumer and Other | Home equity lines of credit |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans purchased | 0 | $ 1,300,000 |  |  |  |
Construction to Permanent - CRE |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 2,464,000 |  | $ 2,464,000 |  |  |
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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