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Derivative and Hedging Activities - Notional Amount and Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Derivatives designated as cash flow hedging instruments: | Interest rate swaps on FHLB advances | Cash flow hedging |  |
Liabilities |  |
Notional Amount |  | $ 5,500
Derivatives designated as cash flow hedging instruments: | Interest rate swaps on FHLB advances | Other Assets | Cash flow hedging |  |
Liabilities |  |
Fair Value |  | 0
Derivatives designated as cash flow hedging instruments: | Interest rate swaps on FHLB advances | Other Liabilities | Cash flow hedging |  |
Liabilities |  |
Fair Value |  | 2
Derivatives designated as cash flow hedging instruments: | Interest rate swaps on multi-family loans held for investment | Fair value hedging |  |
Liabilities |  |
Notional Amount |  | 2,000
Derivatives designated as cash flow hedging instruments: | Interest rate swaps on multi-family loans held for investment | Other Assets | Fair value hedging |  |
Liabilities |  |
Fair Value |  | 0
Derivatives designated as cash flow hedging instruments: | Interest rate swaps on multi-family loans held for investment | Other Liabilities | Fair value hedging |  |
Liabilities |  |
Fair Value |  | 1
Interest rate swaps on multi-family loans held for investment | Mortgage-backed securities forwards | Other Assets |  |
Assets |  |
Notional Amount | $ 186 | 1,012
Fair Value | 7 | 11
Liabilities |  |
Fair Value | 0 | 0
Interest rate swaps on multi-family loans held for investment | Mortgage-backed securities forwards | Other Liabilities |  |
Assets |  |
Fair Value | 0 | 0
Liabilities |  |
Notional Amount | 158 | 1,048
Fair Value | 2 | 32
Interest rate swaps on multi-family loans held for investment | Rate lock commitments | Other Assets |  |
Assets |  |
Notional Amount | 476 | 1,490
Fair Value | 3 | 12
Liabilities |  |
Fair Value | 0 | 0
Interest rate swaps on multi-family loans held for investment | Rate lock commitments | Other Liabilities |  |
Assets |  |
Fair Value | 0 | 0
Liabilities |  |
Notional Amount | 87 | 77
Fair Value | 3 | 3
Interest rate swaps on multi-family loans held for investment | Interest rate swaps and swaptions | Other Assets |  |
Assets |  |
Notional Amount | 1,541 | 5,431
Fair Value | 15 | 115
Liabilities |  |
Fair Value | 0 | 0
Interest rate swaps on multi-family loans held for investment | Interest rate swaps and swaptions | Other Liabilities |  |
Assets |  |
Fair Value | 0 | 0
Liabilities |  |
Notional Amount | 1,782 | 2,720
Fair Value | $ 30 | 59
Interest rate swaps on multi-family loans held for investment | Futures | Other Assets |  |
Liabilities |  |
Fair Value |  | 0
Interest rate swaps on multi-family loans held for investment | Futures | Other Liabilities |  |
Liabilities |  |
Notional Amount |  | 2,235
Fair Value |  | $ 1

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