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Loans Receivable and Allowance for Credit Losses - Narrative (Details) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 | Oct. 01, 2021 | Jan. 01, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans purchased |  |  | $ 19,751,000 | $ 125,765,000 |  |  |  |
Loans receivable, gross | $ 889,892,000 |  | $ 889,892,000 |  | $ 848,316,000 |  |  |
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 |  |  |  |  |
Interest lost on nonaccrual loans, impaired loans | 328,000 | $ 159,000 | $ 605,000 | 262,000 |  |  |  |
Interest lost on nonaccrual loans | $ 152,000 | $ 33,000 | $ 396,000 | 237,000 |  |  |  |
Maximum period for charged off of consumer installment loans |  |  | 180 days |  |  |  |  |
Number of contract modifications | 0 | 0 |  |  |  |  |  |
Discount to appraisal value | 5.80% |  | 5.80% |  |  |  |  |
Discount of appraisal value, selling costs | 8.00% |  | 8.00% |  |  |  |  |
Unfunded Loan Commitment |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for credit loss | $ 1,400,000 |  | $ 1,400,000 |  |  |  |  |
SBA Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 32,300,000 |  | 32,300,000 |  | 32,500,000 |  |  |
Percentage of principal balance guaranteed |  |  |  |  |  | 75.00% | 75.00% | 90.00%
Transfer of loans held-for-sale to portfolio loans | 0 | $ 0 | 0 | 0 |  |  |  |
SBA CARES Act Paycheck Protection Program |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 134,000 |  | 134,000 |  | 157,000 |  |  |
Syndicated and Leveraged Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 5,800,000 |  | $ 5,800,000 |  | 5,800,000 |  |  |
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 | 20,700,000 |  |  |  |
Loans receivable, gross | 499,132,000 |  | $ 499,132,000 |  | 437,443,000 |  |  |
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 | 3,790,000 |  | $ 3,790,000 |  | 4,922,000 |  |  |
Residential Real Estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans purchased | 0 | 0 | 0 | 0 |  |  |  |
Loans receivable, gross | 112,600,000 |  | 112,600,000 |  | 124,140,000 |  |  |
Consumer and Other |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | 111,411,000 |  | $ 111,411,000 |  | 141,091,000 |  |  |
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 | 58,600,000 |  | $ 58,600,000 |  | 78,900,000 |  |  |
Consumer and Other | Unsecured Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans purchased | 1,800,000 | 25,500,000 | 15,400,000 | 75,800,000 |  |  |  |
Consumer and Other | Home equity lines of credit |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans purchased | 1,500,000 | $ 1,600,000 | 1,500,000 | $ 29,300,000 |  |  |  |
Construction to Permanent - CRE |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans receivable, gross | $ 2,463,000 |  | $ 2,463,000 |  | $ 1,933,000 |  |  |
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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