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Loans Receivable and Allowance for Credit Losses - Narrative (Details) | 3 Months Ended | 6 Months Ended |  |  |
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Jun. 30, 2025 USD ($) loan | Jun. 30, 2024 USD ($) loan | Jun. 30, 2025 USD ($) loan | Jun. 30, 2024 USD ($) loan | Dec. 31, 2024 USD ($) | Oct. 01, 2021 | Jan. 01, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans receivable, gross | $ 587,548,000 |  | $ 587,548,000 |  | $ 707,472,000 |  |
Loans purchased |  |  | $ 177,000 | $ 86,000 |  |  |
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 |  |  | 120 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 | 941,000 | $ 933,000 | $ 2,100,000 | $ 1,500,000 |  |  |
Threshold amount for nonaccrual and substandard loans evaluation | $ 100,000 |  | $ 100,000 |  |  |  |
Discount of appraisal value, selling costs | 8.00% |  | 8.00% |  |  |  |
Number of modified contracts | loan | 0 | 0 | 0 | 0 |  |  |
Unfunded Loan Commitment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit loss | $ 81,000 |  | $ 81,000 |  | 182,000 |  |
Business Activities Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans receivable, gross | 587,548,000 |  | 587,548,000 |  | 707,472,000 |  |
Business Activities Loans | Performing (Accruing) Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans receivable, gross | 563,302,000 |  | 563,302,000 |  | 681,601,000 |  |
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 |  |
SBA Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of principal balance guaranteed | 75.00% |  | 75.00% |  |  | 75.00% | 90.00%
Loans receivable, gross | $ 20,800,000 |  | $ 20,800,000 |  | 29,900,000 |  |
Syndicated and Leveraged Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans receivable, gross | 5,600,000 |  | 5,600,000 |  | 5,700,000 |  |
Non-Accrual Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Interest lost on nonaccrual loans | 64,000 | $ 205,000 | $ 82,000 | $ 226,000 |  |  |
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 receivable, gross | 370,376,000 |  | $ 370,376,000 |  | 419,489,000 |  |
Loans purchased | 0 | 0 | 0 | 0 |  |  |
Commercial Real Estate | Business Activities Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans receivable, gross | 370,376,000 |  | 370,376,000 |  | 419,489,000 |  |
Commercial Real Estate | Business Activities Loans | Performing (Accruing) Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans receivable, gross | 349,483,000 |  | 349,483,000 |  | 400,155,000 |  |
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 | 0 |  | $ 0 |  | 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 | 1,494,000 |  | $ 1,494,000 |  | 3,830,000 |  |
Construction | Business Activities Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans receivable, gross | 1,494,000 |  | 1,494,000 |  | 3,830,000 |  |
Construction | Business Activities Loans | Performing (Accruing) Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans receivable, gross | 1,494,000 |  | 1,494,000 |  | 3,830,000 |  |
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 receivable, gross | 60,123,000 |  | 60,123,000 |  | 92,215,000 |  |
Loans purchased | 92,000 | 38,000 | 178,000 | 86,000 |  |  |
Bank sold | 28,900,000 |  | 28,900,000 |  |  |  |
Residential Real Estate | Business Activities Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans receivable, gross | 60,123,000 |  | 60,123,000 |  | 92,215,000 |  |
Residential Real Estate | Business Activities Loans | Performing (Accruing) Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans receivable, gross | 60,123,000 |  | 60,123,000 |  | 92,106,000 |  |
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 | 33,363,000 |  | 33,363,000 |  | 59,973,000 |  |
Consumer and Other | Business Activities Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans receivable, gross | 33,363,000 |  | 33,363,000 |  | 59,973,000 |  |
Consumer and Other | Business Activities Loans | Performing (Accruing) Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans receivable, gross | 32,910,000 |  | 32,910,000 |  | 59,243,000 |  |
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 |  | 0 |  |
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 | 12,400,000 |  | $ 12,400,000 |  | 20,700,000 |  |
Consumer and Other | Unsecured Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans purchased | 0 | 0 | 0 | 0 |  |  |
Consumer and Other | Home equity lines of credit |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans purchased | 0 | $ 0 | 0 | $ 0 |  |  |
Bank sold | 15,900,000 |  | 15,900,000 |  |  |  |
Construction to Permanent - CRE |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans receivable, gross | 31,000 |  | 31,000 |  | 2,357,000 |  |
Construction to Permanent - CRE | Business Activities Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans receivable, gross | 31,000 |  | 31,000 |  | 2,357,000 |  |
Construction to Permanent - CRE | Business Activities Loans | Performing (Accruing) Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans receivable, gross | 0 |  | 0 |  | 0 |  |
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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