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Loans Receivable and Allowance for Credit Losses - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
lending_initiative
loan
Sep. 30, 2024
USD ($)
loan
Sep. 30, 2025
USD ($)
lending_initiative
loan
Sep. 30, 2024
USD ($)
loan
Dec. 31, 2024
USD ($)
Oct. 01, 2021
Jan. 01, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Payments to acquire loans receivable     $ 26,040,000 $ 127,000      
Loans receivable, gross $ 588,666,000   $ 588,666,000   $ 707,472,000    
Targeted Lending Initiatives | lending_initiative 3   3        
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 $ 1,800,000 $ 900,000 $ 3,000,000.0 $ 2,200,000      
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 $ 54,000   $ 54,000   182,000    
SBA Loans              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable, gross $ 18,700,000   $ 18,700,000   29,900,000    
Percentage of principal balance guaranteed 75.00%   75.00%     75.00% 90.00%
Syndicated and Leveraged Loans              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable, gross $ 5,600,000   $ 5,600,000   5,700,000    
Unsecured Line of Credit Program for High-Net-Worth Individuals              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing receivable before allowance for credit loss maturity, term 1 year   1 year        
Unsecured Line of Credit Program for High-Net-Worth Individuals | Minimum              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable, gross $ 250,000   $ 250,000        
Unsecured Line of Credit Program for High-Net-Worth Individuals | Maximum              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable, gross 5,000,000   5,000,000        
Rediscount Line of Credit Program | Minimum              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable, gross $ 1,000,000   $ 1,000,000        
Financing receivable before allowance for credit loss maturity, term 12 months   12 months        
Rediscount Line of Credit Program | Maximum              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable, gross $ 15,000,000   $ 15,000,000        
Financing receivable before allowance for credit loss maturity, term 36 months   36 months        
Commercial Real Estate Lending Program | Minimum              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable, gross $ 1,000,000   $ 1,000,000        
Financing receivable before allowance for credit loss maturity, term 12 months   12 months        
Commercial Real Estate Lending Program | Maximum              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable, gross $ 25,000,000   $ 25,000,000        
Financing receivable before allowance for credit loss maturity, term 60 months   60 months        
Non-Accrual Loans              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Interest lost on nonaccrual loans $ 234,000 $ 325,000 $ 251,000 $ 543,000      
Residential Real Estate              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Payments to acquire loans receivable 26,000,000.0 41,000 26,000,000.0 127,000      
Bank sold 0.0 0 28,900,000 0      
Loans receivable, gross 83,672,000   $ 83,672,000   92,215,000    
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 360,802,000   $ 360,802,000   419,489,000    
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%        
Consumer and Other              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans receivable, gross 20,802,000   $ 20,802,000   59,973,000    
Consumer and Other | Unsecured Consumer Loans              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Bank sold 9,000,000   9,000,000        
Loans receivable, gross 1,000,000.0   $ 1,000,000.0   $ 20,700,000    
Individual unsecured consumer loans | loan     1,092        
Proceeds from sale of debt securities, available-for-sale   $ 0   $ 0      
Consumer and Other | Home equity lines of credit              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Bank sold $ 0.0   $ 15,900,000