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Derivative and Hedging Activities - Notional Amount and Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Derivatives designated hedging instruments: | Interest rate swaps on FHLB advances
Liabilities
Fair Value	$ 26	$ 2
Derivatives designated hedging instruments: | Interest rate swaps on FHLB advances | Cash flow hedging
Liabilities
Notional Amount	5,500	5,500
Derivatives designated hedging instruments: | Interest rate swaps on FHLB advances | Other Assets | Cash flow hedging
Liabilities
Fair Value	26	0
Derivatives designated hedging instruments: | Interest rate swaps on FHLB advances | Other Liabilities | Cash flow hedging
Liabilities
Fair Value	0	2
Derivatives designated hedging instruments: | Interest rate swaps on multi-family loans held for investment
Liabilities
Fair Value	0	1
Derivatives designated hedging instruments: | Interest rate swaps on multi-family loans held for investment | Fair value hedging
Liabilities
Notional Amount	2,000	2,000
Derivatives designated hedging instruments: | Interest rate swaps on multi-family loans held for investment | Other Assets | Fair value hedging
Liabilities
Fair Value	0	0
Derivatives designated hedging instruments: | Interest rate swaps on multi-family loans held for investment | Other Liabilities | Fair value hedging
Liabilities
Fair Value	0	1
Derivatives not designated as hedging instruments:
Assets
Fair Value	111	126
Liabilities
Fair Value	70	92
Derivatives not designated as hedging instruments: | Futures
Assets
Fair Value	1
Liabilities
Fair Value		1
Derivatives not designated as hedging instruments: | Futures | Other Assets
Assets
Notional Amount	1,890
Fair Value	1
Liabilities
Fair Value		0
Derivatives not designated as hedging instruments: | Futures | Other Liabilities
Assets
Fair Value	0
Liabilities
Notional Amount		2,235
Fair Value		1
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards
Assets
Fair Value	7	11
Liabilities
Fair Value	9	32
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards | Other Assets
Assets
Notional Amount	1,468	1,012
Fair Value	7	11
Liabilities
Fair Value	0	0
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards | Other Liabilities
Assets
Fair Value	0	0
Liabilities
Notional Amount	1,375	1,048
Fair Value	9	32
Derivatives not designated as hedging instruments: | Rate lock commitments | Other Assets
Assets
Notional Amount	1,847	1,490
Fair Value	11	12
Liabilities
Fair Value	0	0
Derivatives not designated as hedging instruments: | Rate lock commitments | Other Liabilities
Assets
Fair Value	0	0
Liabilities
Notional Amount	225	77
Fair Value	3	3
Derivatives not designated as hedging instruments: | Interest rate swaps and swaptions | Other Assets
Assets
Notional Amount	5,745	5,431
Fair Value	103	115
Liabilities
Fair Value	0	0
Derivatives not designated as hedging instruments: | Interest rate swaps and swaptions | Other Liabilities
Assets
Fair Value	0	0
Liabilities
Notional Amount	2,833	2,720
Fair Value	$ 61	$ 59

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