Borrowed Funds - Maturities of FHLBNY Advances and Lines of Credit (Details) $ in Thousands |
Sep. 30, 2026
USD ($)
|
|---|---|
| Debt Disclosure [Abstract] | |
| Due in one year or less | $ 2,244,500 |
| Due after one year through two years | 2,030 |
| Due after two years through three years | 0 |
| Due after three years through four years | 50,000 |
| Thereafter | 0 |
| PAA on borrowed funds | 1,265 |
| Total FHLBNY advances and overnight borrowings | $ 2,297,795 |