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Loans, Allowance for Credit Losses and Credit Quality - Schedule of Information Regarding Nonaccrual Loans (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]        
With an Allowance for Credit Losses $ 8,808,000 [1] $ 8,670,000 [1] $ 8,884,000 $ 8,591,000
Total 1,264,000   1,957,000  
Interest Income Recognized 39,000 15,000    
Real Estate Loans | Home Equity Lines of Credit and Loans        
Accounts Notes And Loans Receivable [Line Items]        
With an Allowance for Credit Losses 119,000 [1] 319,000 [1] 118,000 321,000
Total 305,000   85,000  
Real Estate Loans | One- to Four-Family Residential        
Accounts Notes And Loans Receivable [Line Items]        
With an Allowance for Credit Losses 2,698,000 [1] $ 3,511,000 [1] 2,928,000 $ 3,555,000
Total 959,000   1,872,000  
Nonperforming Financing Instruments        
Accounts Notes And Loans Receivable [Line Items]        
With an Allowance for Credit Losses 0   0  
Without an Allowance for Credit Losses 1,264,000   1,957,000  
Total 1,264,000   1,957,000  
Interest Income Recognized 39,000   54,000  
Nonperforming Financing Instruments | Real Estate Loans | Home Equity Lines of Credit and Loans        
Accounts Notes And Loans Receivable [Line Items]        
With an Allowance for Credit Losses 0   0  
Without an Allowance for Credit Losses 305,000   85,000  
Total 305,000   85,000  
Interest Income Recognized 11,000   1,000  
Nonperforming Financing Instruments | Real Estate Loans | One- to Four-Family Residential        
Accounts Notes And Loans Receivable [Line Items]        
With an Allowance for Credit Losses 0   0  
Without an Allowance for Credit Losses 959,000   1,872,000  
Total 959,000   1,872,000  
Interest Income Recognized $ 28,000   $ 53,000  
[1] Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $3.8 million and $3.5 million as of March 31, 2025 and December 31, 2024.