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Loan Portfolio and Allowance for Credit Losses - Recorded Investment in Loans by Loan Class (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net $ 5,191,770   $ 5,098,058      
Less: Allowance for credit losses on loans 51,891 $ 51,265 50,248 $ 49,950 $ 49,772 $ 48,578
Net loans 5,139,879   5,047,810      
Commercial [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net 311,491   286,857      
Less: Allowance for credit losses on loans 3,131 3,134 3,420 3,352 3,429 2,735
Real Estate Mortgage - 1 to 4 Family [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net 4,868,048   4,797,563      
Less: Allowance for credit losses on loans 48,517 47,877 46,636 46,392 46,129 45,625
Installment [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net 12,231   13,638      
Less: Allowance for credit losses on loans 243 $ 254 192 $ 206 $ 214 $ 218
New York and Other States [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net [1] 3,343,303   3,277,169      
New York and Other States [Member] | Installment [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net [1] 8,998   9,885      
Florida [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net 1,848,467   1,820,889      
Florida [Member] | Installment [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net 3,233   3,753      
Commercial Real Estate [Member] | Commercial [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net 294,055   267,300      
Commercial Real Estate [Member] | New York and Other States [Member] | Commercial [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net [1] 245,585   227,771      
Commercial Real Estate [Member] | Florida [Member] | Commercial [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net 48,470   39,529      
Other [Member] | Commercial [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net 17,436   19,557      
Other [Member] | New York and Other States [Member] | Commercial [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net [1] 17,436   19,144      
Other [Member] | Florida [Member] | Commercial [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net 0   413      
First Mortgages [Member] | Real Estate Mortgage - 1 to 4 Family [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net 4,358,805   4,331,563      
First Mortgages [Member] | New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net [1] 2,767,044   2,741,334      
First Mortgages [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net 1,591,761   1,590,229      
Home Equity Loans [Member] | Real Estate Mortgage - 1 to 4 Family [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net 62,008   56,739      
Home Equity Loans [Member] | New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net [1] 45,611   43,096      
Home Equity Loans [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net 16,397   13,643      
Home Equity Lines of Credit [Member] | Real Estate Mortgage - 1 to 4 Family [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net 447,235   409,261      
Home Equity Lines of Credit [Member] | New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net [1] 258,629   235,939      
Home Equity Lines of Credit [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]            
Loan Portfolio and Allowance for Credit Losses [Abstract]            
Total loans, net $ 188,606   $ 173,322      
[1] Includes New York, New Jersey, Vermont and Massachussetts.