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Loans Receivable and Allowance for Credit losses (Recorded Investment in Loans Receivable) (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due loans $ 3,317,402,000 $ 3,082,418,000  
Deferred loan fees, net (4,086,000) (4,714,000)  
Allowance for credit losses (33,608,000) (32,373,000) $ (37,119,000)
Sub-total (37,694,000) (37,087,000)  
Financing Receivable, Net, Total 3,279,708,000 3,045,331,000  
Residential [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due loans 248,295,000 250,123,000  
Allowance for credit losses (2,344,000) (2,474,000) (4,094,000)
Commercial And Multi-Family [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due loans 2,434,115,000 2,345,229,000  
Allowance for credit losses (16,301,000) (21,749,000) (22,065,000)
Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due loans 192,816,000 144,931,000  
Allowance for credit losses (3,841,000) (2,094,000) (2,231,000)
Commercial Business [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due loans 372,202,000 282,007,000  
Allowance for credit losses (10,353,000) (5,367,000) (8,000,000)
Home Equity [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due loans 66,331,000 56,888,000  
Allowance for credit losses (691,000) (485,000) (533,000)
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due loans 3,643,000 3,240,000  
Allowance for credit losses $ (78,000) $ (24,000) $ (14,000)