v3.26.3
Loan Portfolio and Allowance for Credit Losses - Performance of Loans Modified to Borrowers Experiencing Financial Difficulty (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Sep. 30, 2025
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans $ 1,036 $ 862
Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 802 502
30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 122
60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 238
90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 234 0
Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Installment [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Installment [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Installment [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Installment [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
New York and Other States [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 304 532
New York and Other States [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 70 172
New York and Other States [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 122
New York and Other States [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 238
New York and Other States [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 234 0
New York and Other States [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
New York and Other States [Member] | Installment [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
New York and Other States [Member] | Installment [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
New York and Other States [Member] | Installment [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
New York and Other States [Member] | Installment [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
Florida [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 732 330
Florida [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 732 330
Florida [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Florida [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Florida [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Florida [Member] | Installment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Florida [Member] | Installment [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Florida [Member] | Installment [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Florida [Member] | Installment [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Florida [Member] | Installment [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Commercial Real Estate [Member] | Commercial Portfolio Segment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Commercial Real Estate [Member] | Commercial Portfolio Segment [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Commercial Real Estate [Member] | Commercial Portfolio Segment [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Commercial Real Estate [Member] | Commercial Portfolio Segment [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Commercial Real Estate [Member] | Commercial Portfolio Segment [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Commercial Real Estate [Member] | New York and Other States [Member] | Commercial Portfolio Segment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
Commercial Real Estate [Member] | New York and Other States [Member] | Commercial Portfolio Segment [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
Commercial Real Estate [Member] | New York and Other States [Member] | Commercial Portfolio Segment [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
Commercial Real Estate [Member] | New York and Other States [Member] | Commercial Portfolio Segment [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
Commercial Real Estate [Member] | New York and Other States [Member] | Commercial Portfolio Segment [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
Commercial Real Estate [Member] | Florida [Member] | Commercial Portfolio Segment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Commercial Real Estate [Member] | Florida [Member] | Commercial Portfolio Segment [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Commercial Real Estate [Member] | Florida [Member] | Commercial Portfolio Segment [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Commercial Real Estate [Member] | Florida [Member] | Commercial Portfolio Segment [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Commercial Real Estate [Member] | Florida [Member] | Commercial Portfolio Segment [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Other [Member] | Commercial Portfolio Segment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Other [Member] | Commercial Portfolio Segment [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Other [Member] | Commercial Portfolio Segment [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Other [Member] | Commercial Portfolio Segment [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Other [Member] | Commercial Portfolio Segment [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Other [Member] | New York and Other States [Member] | Commercial Portfolio Segment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
Other [Member] | New York and Other States [Member] | Commercial Portfolio Segment [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
Other [Member] | New York and Other States [Member] | Commercial Portfolio Segment [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
Other [Member] | New York and Other States [Member] | Commercial Portfolio Segment [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
Other [Member] | New York and Other States [Member] | Commercial Portfolio Segment [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
Other [Member] | Florida [Member] | Commercial Portfolio Segment [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Other [Member] | Florida [Member] | Commercial Portfolio Segment [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Other [Member] | Florida [Member] | Commercial Portfolio Segment [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Other [Member] | Florida [Member] | Commercial Portfolio Segment [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Other [Member] | Florida [Member] | Commercial Portfolio Segment [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans   0
First Mortgages [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 1,036 675
First Mortgages [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 802 437
First Mortgages [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
First Mortgages [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 238
First Mortgages [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 234 0
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]    
Performance of modified loans [1] 304 392
First Mortgages [Member] | New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 70 154
First Mortgages [Member] | New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
First Mortgages [Member] | New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 238
First Mortgages [Member] | New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 234 0
First Mortgages [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 732 283
First Mortgages [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 732 283
First Mortgages [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
First Mortgages [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
First Mortgages [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Home Equity Loans [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 18
Home Equity Loans [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 18
Home Equity Loans [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Home Equity Loans [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Home Equity Loans [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
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]    
Performance of modified loans [1] 0 18
Home Equity Loans [Member] | New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 18
Home Equity Loans [Member] | New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
Home Equity Loans [Member] | New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
Home Equity Loans [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Home Equity Loans [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Home Equity Loans [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Home Equity Loans [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Home Equity Loans [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Home Equity Lines of Credit [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 169
Home Equity Lines of Credit [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 47
Home Equity Lines of Credit [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 122
Home Equity Lines of Credit [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Home Equity Lines of Credit [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
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]    
Performance of modified loans [1] 0 122
Home Equity Lines of Credit [Member] | New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
Home Equity Lines of Credit [Member] | New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 122
Home Equity Lines of Credit [Member] | New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
Home Equity Lines of Credit [Member] | New York and Other States [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans [1] 0 0
Home Equity Lines of Credit [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 47
Home Equity Lines of Credit [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | Current [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 47
Home Equity Lines of Credit [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 30 - 59 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Home Equity Lines of Credit [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 60 - 89 Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans 0 0
Home Equity Lines of Credit [Member] | Florida [Member] | Real Estate Mortgage - 1 to 4 Family [Member] | 90+ Days Past Due [Member]    
Loan Portfolio and Allowance for Credit Losses [Abstract]    
Performance of modified loans $ 0 $ 0
[1] Includes New York, New Jersey, Vermont and Massachusetts.