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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