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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