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Loans Receivable and Allowance for Credit losses (Allowance for Loan Losses) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance $ 32,373,000 $ 37,119,000  
Allowance for loan losses: Charge-offs (805,000) (2,095,000)  
Allowance for loan losses: Recoveries 101,000 424,000  
Provision (benefit) for credit losses 6,104,000 (3,075,000) $ 3,855,000
Allowance for loan losses: Ending Balance 33,608,000 32,373,000 37,119,000
Allowance for loan losses: Ending balance: Individually evaluated for impairment 4,229,000 2,784,000  
Allowance for loan losses: Ending balance: Collectively evaluated for impairment 29,379,000 29,589,000  
Loans receivables: Ending balance: individually evaluated for impairment 54,019,000 28,272,000  
Loans receivables: Ending balance: collectively evaluated for impairment 3,263,383,000 3,054,146,000  
Total Loans Receivable 3,317,402,000 3,082,418,000  
Residential [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance 2,474,000 4,094,000  
Allowance for loan losses: Recoveries 45,000 23,000  
Provision (benefit) for credit losses (319,000) (1,643,000)  
Allowance for loan losses: Ending Balance 2,344,000 2,474,000 4,094,000
Allowance for loan losses: Ending balance: Individually evaluated for impairment   196,000  
Allowance for loan losses: Ending balance: Collectively evaluated for impairment 2,344,000 2,278,000  
Loans receivables: Ending balance: individually evaluated for impairment 444,000 5,147,000  
Loans receivables: Ending balance: collectively evaluated for impairment 247,851,000 244,976,000  
Total Loans Receivable 248,295,000 250,123,000  
Commercial And Multi-Family [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance 21,749,000 22,065,000  
Provision (benefit) for credit losses 1,675,000 (316,000)  
Allowance for loan losses: Ending Balance 16,301,000 21,749,000 22,065,000
Allowance for loan losses: Ending balance: Individually evaluated for impairment 990,000    
Allowance for loan losses: Ending balance: Collectively evaluated for impairment 15,311,000 21,749,000  
Loans receivables: Ending balance: individually evaluated for impairment 42,259,000 15,397,000  
Loans receivables: Ending balance: collectively evaluated for impairment 2,391,856,000 2,329,832,000  
Total Loans Receivable 2,434,115,000 2,345,229,000  
Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance 2,094,000 2,231,000  
Provision (benefit) for credit losses 360,000 (137,000)  
Allowance for loan losses: Ending Balance 3,841,000 2,094,000 2,231,000
Allowance for loan losses: Ending balance: Individually evaluated for impairment 310,000 518,000  
Allowance for loan losses: Ending balance: Collectively evaluated for impairment 3,531,000 1,576,000  
Loans receivables: Ending balance: individually evaluated for impairment 4,292,000 3,180,000  
Loans receivables: Ending balance: collectively evaluated for impairment 188,524,000 141,751,000  
Total Loans Receivable 192,816,000 144,931,000  
Commercial Business [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance 5,367,000 8,000,000  
Allowance for loan losses: Charge-offs (805,000) (2,095,000)  
Allowance for loan losses: Recoveries 40,000 191,000  
Provision (benefit) for credit losses 4,333,000 (729,000)  
Allowance for loan losses: Ending Balance 10,353,000 5,367,000 8,000,000
Allowance for loan losses: Ending balance: Individually evaluated for impairment 2,929,000 2,066,000  
Allowance for loan losses: Ending balance: Collectively evaluated for impairment 7,424,000 3,301,000  
Loans receivables: Ending balance: individually evaluated for impairment 6,812,000 3,821,000  
Loans receivables: Ending balance: collectively evaluated for impairment 365,390,000 278,186,000  
Total Loans Receivable 372,202,000 282,007,000  
Home Equity [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance 485,000 533,000  
Allowance for loan losses: Recoveries 16,000 12,000  
Provision (benefit) for credit losses 8,000 (60,000)  
Allowance for loan losses: Ending Balance 691,000 485,000 533,000
Allowance for loan losses: Ending balance: Individually evaluated for impairment   4,000  
Allowance for loan losses: Ending balance: Collectively evaluated for impairment 691,000 481,000  
Loans receivables: Ending balance: individually evaluated for impairment 212,000 727,000  
Loans receivables: Ending balance: collectively evaluated for impairment 66,119,000 56,161,000  
Total Loans Receivable 66,331,000 56,888,000  
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance 24,000 14,000  
Allowance for loan losses: Recoveries   198,000  
Provision (benefit) for credit losses 47,000 (188,000)  
Allowance for loan losses: Ending Balance 78,000 24,000 14,000
Allowance for loan losses: Ending balance: Collectively evaluated for impairment 78,000 24,000  
Loans receivables: Ending balance: collectively evaluated for impairment 3,643,000 3,240,000  
Total Loans Receivable 3,643,000 3,240,000  
Unallocated [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance 180,000 182,000  
Provision (benefit) for credit losses   (2,000)  
Allowance for loan losses: Ending Balance   180,000 $ 182,000
Allowance for loan losses: Ending balance: Collectively evaluated for impairment   180,000  
Cumulative Effect, Period of Adoption, Adjustment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance (4,165,000)    
Allowance for loan losses: Ending Balance   (4,165,000)  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Residential [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance 144,000    
Allowance for loan losses: Ending Balance   144,000  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial And Multi-Family [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance (7,123,000)    
Allowance for loan losses: Ending Balance   (7,123,000)  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance 1,387,000    
Allowance for loan losses: Ending Balance   1,387,000  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial Business [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance 1,418,000    
Allowance for loan losses: Ending Balance   1,418,000  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Home Equity [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance 182,000    
Allowance for loan losses: Ending Balance   182,000  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance 7,000    
Allowance for loan losses: Ending Balance   7,000  
Cumulative Effect, Period of Adoption, Adjustment [Member] | Unallocated [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance (180,000)    
Allowance for loan losses: Ending Balance   (180,000)  
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance 28,208,000    
Allowance for loan losses: Ending Balance   28,208,000  
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Residential [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance 2,618,000    
Allowance for loan losses: Ending Balance   2,618,000  
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commercial And Multi-Family [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance 14,626,000    
Allowance for loan losses: Ending Balance   14,626,000  
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance 3,481,000    
Allowance for loan losses: Ending Balance   3,481,000  
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commercial Business [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance 6,785,000    
Allowance for loan losses: Ending Balance   6,785,000  
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Home Equity [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance 667,000    
Allowance for loan losses: Ending Balance   667,000  
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Allowance for loan losses: Beginning Balance $ 31,000    
Allowance for loan losses: Ending Balance   $ 31,000