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Loans Receivable and Allowance for Credit losses (Loan Portfolio by Pass Rating) (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Current Fiscal Year $ 281,000,000  
Total Loans, Fiscal Year Before Latest Fiscal Year 959,372,000  
Total Loans, Two Years Before Latest Fiscal Year 333,030,000  
Total Loans, Three Years Before Latest Fiscal Year 276,923,000  
Total Loans, Four Years Before Latest Fiscal Year 72,067,000  
Total Loans, Prior 1,021,468,000  
Financing Receivable, Revolving 372,777,000  
Financing Receivable, Revolving, Converted to Term Loan 765,000  
Past due loans 3,317,402,000 $ 3,082,418,000
Gross Charge-Offs, Fiscal Year Before Latest Fiscal Year 500,000  
Gross Charge-Offs, Fiscal Year Before Latest Fiscal Year 305,000  
Gross Charge-Offs 805,000 2,095,000
Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past due loans 85,700,000 17,800,000
Residential [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Current Fiscal Year 17,080,000  
Total Loans, Fiscal Year Before Latest Fiscal Year 54,115,000  
Total Loans, Two Years Before Latest Fiscal Year 39,579,000  
Total Loans, Three Years Before Latest Fiscal Year 31,420,000  
Total Loans, Four Years Before Latest Fiscal Year 12,067,000  
Total Loans, Prior 94,034,000  
Past due loans 248,295,000 250,123,000
Residential [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Current Fiscal Year 17,080,000  
Total Loans, Fiscal Year Before Latest Fiscal Year 53,623,000  
Total Loans, Two Years Before Latest Fiscal Year 38,178,000  
Total Loans, Three Years Before Latest Fiscal Year 31,420,000  
Total Loans, Four Years Before Latest Fiscal Year 12,067,000  
Total Loans, Prior 93,764,000  
Past due loans 246,132,000  
Residential [Member] | Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Fiscal Year Before Latest Fiscal Year 492,000  
Total Loans, Two Years Before Latest Fiscal Year 91,000  
Past due loans 583,000  
Residential [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Two Years Before Latest Fiscal Year 1,310,000  
Total Loans, Prior 270,000  
Past due loans 1,580,000  
Commercial And Multi-Family [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Current Fiscal Year 232,343,000  
Total Loans, Fiscal Year Before Latest Fiscal Year 827,382,000  
Total Loans, Two Years Before Latest Fiscal Year 228,846,000  
Total Loans, Three Years Before Latest Fiscal Year 218,343,000  
Total Loans, Four Years Before Latest Fiscal Year 51,284,000  
Total Loans, Prior 873,855,000  
Financing Receivable, Revolving 2,062,000  
Past due loans 2,434,115,000 2,345,229,000
Commercial And Multi-Family [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Current Fiscal Year 222,435,000  
Total Loans, Fiscal Year Before Latest Fiscal Year 778,076,000  
Total Loans, Two Years Before Latest Fiscal Year 224,823,000  
Total Loans, Three Years Before Latest Fiscal Year 214,768,000  
Total Loans, Four Years Before Latest Fiscal Year 50,755,000  
Total Loans, Prior 824,375,000  
Financing Receivable, Revolving 1,922,000  
Past due loans 2,317,154,000  
Commercial And Multi-Family [Member] | Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Current Fiscal Year 9,908,000  
Total Loans, Fiscal Year Before Latest Fiscal Year 34,375,000  
Total Loans, Four Years Before Latest Fiscal Year 529,000  
Total Loans, Prior 4,453,000  
Financing Receivable, Revolving 140,000  
Past due loans 49,405,000  
Commercial And Multi-Family [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Fiscal Year Before Latest Fiscal Year 14,931,000  
Total Loans, Two Years Before Latest Fiscal Year 4,023,000  
Total Loans, Three Years Before Latest Fiscal Year 3,575,000  
Total Loans, Prior 45,027,000  
Past due loans 67,556,000  
Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Current Fiscal Year 21,730,000  
Total Loans, Fiscal Year Before Latest Fiscal Year 75,574,000  
Total Loans, Two Years Before Latest Fiscal Year 59,564,000  
Total Loans, Three Years Before Latest Fiscal Year 22,048,000  
Total Loans, Prior 8,190,000  
Financing Receivable, Revolving 5,710,000  
Past due loans 192,816,000 144,931,000
Construction [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Current Fiscal Year 21,730,000  
Total Loans, Fiscal Year Before Latest Fiscal Year 74,180,000  
Total Loans, Two Years Before Latest Fiscal Year 59,564,000  
Total Loans, Three Years Before Latest Fiscal Year 21,462,000  
Total Loans, Prior 5,878,000  
Financing Receivable, Revolving 5,710,000  
Past due loans 188,524,000  
Construction [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Fiscal Year Before Latest Fiscal Year 1,394,000  
Total Loans, Three Years Before Latest Fiscal Year 586,000  
Total Loans, Prior 2,312,000  
Past due loans 4,292,000  
Commercial Business [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Current Fiscal Year 3,328,000  
Total Loans, Fiscal Year Before Latest Fiscal Year 297,000  
Total Loans, Two Years Before Latest Fiscal Year 2,967,000  
Total Loans, Three Years Before Latest Fiscal Year 4,234,000  
Total Loans, Four Years Before Latest Fiscal Year 7,397,000  
Total Loans, Prior 39,208,000  
Financing Receivable, Revolving 314,771,000  
Past due loans 372,202,000 282,007,000
Gross Charge-Offs 805,000 2,095,000
Commercial Business [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Current Fiscal Year 3,328,000  
Total Loans, Fiscal Year Before Latest Fiscal Year 297,000  
Total Loans, Two Years Before Latest Fiscal Year 2,967,000  
Total Loans, Three Years Before Latest Fiscal Year 4,234,000  
Total Loans, Four Years Before Latest Fiscal Year 7,080,000  
Total Loans, Prior 33,675,000  
Financing Receivable, Revolving 302,540,000  
Past due loans 354,121,000  
Commercial Business [Member] | Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Four Years Before Latest Fiscal Year 317,000  
Total Loans, Prior 830,000  
Financing Receivable, Revolving 5,010,000  
Past due loans 6,157,000  
Commercial Business [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Prior 4,703,000  
Financing Receivable, Revolving 7,221,000  
Past due loans 11,924,000  
Home Equity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Current Fiscal Year 5,022,000  
Total Loans, Fiscal Year Before Latest Fiscal Year 1,533,000  
Total Loans, Two Years Before Latest Fiscal Year 553,000  
Total Loans, Three Years Before Latest Fiscal Year 769,000  
Total Loans, Four Years Before Latest Fiscal Year 1,280,000  
Total Loans, Prior 6,181,000  
Financing Receivable, Revolving 50,228,000  
Financing Receivable, Revolving, Converted to Term Loan 765,000  
Past due loans 66,331,000 56,888,000
Home Equity [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Current Fiscal Year 5,022,000  
Total Loans, Fiscal Year Before Latest Fiscal Year 1,487,000  
Total Loans, Two Years Before Latest Fiscal Year 553,000  
Total Loans, Three Years Before Latest Fiscal Year 769,000  
Total Loans, Four Years Before Latest Fiscal Year 1,280,000  
Total Loans, Prior 6,181,000  
Financing Receivable, Revolving 50,111,000  
Financing Receivable, Revolving, Converted to Term Loan 553,000  
Past due loans 65,956,000  
Home Equity [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Fiscal Year Before Latest Fiscal Year 46,000  
Financing Receivable, Revolving 117,000  
Financing Receivable, Revolving, Converted to Term Loan 212,000  
Past due loans 375,000  
Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Current Fiscal Year 1,497,000  
Total Loans, Fiscal Year Before Latest Fiscal Year 471,000  
Total Loans, Two Years Before Latest Fiscal Year 1,521,000  
Total Loans, Three Years Before Latest Fiscal Year 109,000  
Total Loans, Four Years Before Latest Fiscal Year 39,000  
Financing Receivable, Revolving 6,000  
Past due loans 3,643,000 3,240,000
Consumer [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans, Current Fiscal Year 1,497,000  
Total Loans, Fiscal Year Before Latest Fiscal Year 471,000  
Total Loans, Two Years Before Latest Fiscal Year 1,521,000  
Total Loans, Three Years Before Latest Fiscal Year 109,000  
Total Loans, Four Years Before Latest Fiscal Year 39,000  
Financing Receivable, Revolving 6,000  
Past due loans 3,643,000  
Originated Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans   3,082,418,000
Originated Loans [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans   3,045,700,000
Originated Loans [Member] | Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans   18,902,000
Originated Loans [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans   17,816,000
Originated Loans [Member] | Residential [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past due loans 248,295,000 250,123,000
Total Loans   250,123,000
Originated Loans [Member] | Residential [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans   249,398,000
Originated Loans [Member] | Residential [Member] | Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans   303,000
Originated Loans [Member] | Residential [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans   422,000
Originated Loans [Member] | Commercial And Multi-Family [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past due loans 2,434,115,000 2,345,229,000
Total Loans   2,345,229,000
Originated Loans [Member] | Commercial And Multi-Family [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans   2,320,865,000
Originated Loans [Member] | Commercial And Multi-Family [Member] | Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans   14,183,000
Originated Loans [Member] | Commercial And Multi-Family [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans   10,181,000
Originated Loans [Member] | Construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past due loans 192,816,000 144,931,000
Total Loans   144,931,000
Originated Loans [Member] | Construction [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans   141,751,000
Originated Loans [Member] | Construction [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans   3,180,000
Originated Loans [Member] | Commercial Business [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past due loans 372,202,000 282,007,000
Total Loans   282,007,000
Originated Loans [Member] | Commercial Business [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans   273,770,000
Originated Loans [Member] | Commercial Business [Member] | Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans   4,416,000
Originated Loans [Member] | Commercial Business [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans   3,821,000
Originated Loans [Member] | Home Equity [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past due loans 66,331,000 56,888,000
Total Loans   56,888,000
Originated Loans [Member] | Home Equity [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans   56,676,000
Originated Loans [Member] | Home Equity [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans   212,000
Originated Loans [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past due loans $ 3,643,000 3,240,000
Total Loans   3,240,000
Originated Loans [Member] | Consumer [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Loans   $ 3,240,000