Loans and Leases - Quality of Loans Held for Investment (Details) - USD ($) $ in Millions		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans Receivable	[1]	$ 69,001		$ 45,738
Multi-Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans Receivable		38,130		34,628
Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans Receivable		8,526		6,701
One-to-Four Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans Receivable		5,821		160
One-to-Four Family First Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans Receivable		5,821		160
Acquisition, Development, and Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans Receivable		1,996		209
Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non- Accrual Loans						$ 3
Total Loans Receivable	[3]	12,276	[2]	4,034	[4]
Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans Receivable		2,252		6
Non-Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non- Accrual Loans		141		33
Total Loans Receivable		69,001		45,738
Non-Covered Loans | Financing Receivable, 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		70		67
Non-Covered Loans | Total Past Due Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		211		100
Non-Covered Loans | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		68,790		45,638
Non-Covered Loans | Multi-Family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non- Accrual Loans		13		10
Total Loans Receivable		38,130		34,628
Non-Covered Loans | Multi-Family | Financing Receivable, 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		34		57
Non-Covered Loans | Multi-Family | Total Past Due Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		47		67
Non-Covered Loans | Multi-Family | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		38,083		34,561
Non-Covered Loans | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non- Accrual Loans		20		16
Total Loans Receivable		8,526		6,701
Non-Covered Loans | Commercial Real Estate | Financing Receivable, 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		2		2
Non-Covered Loans | Commercial Real Estate | Total Past Due Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		22		18
Non-Covered Loans | Commercial Real Estate | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		8,504		6,683
Non-Covered Loans | One-to-Four Family First Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non- Accrual Loans		92		1
Total Loans Receivable		5,821		160
Non-Covered Loans | One-to-Four Family First Mortgage | Financing Receivable, 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		21		8
Non-Covered Loans | One-to-Four Family First Mortgage | Total Past Due Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		113		9
Non-Covered Loans | One-to-Four Family First Mortgage | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		5,708		151
Non-Covered Loans | Acquisition, Development, and Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans Receivable		1,996		209
Non-Covered Loans | Acquisition, Development, and Construction | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		1,996		209
Non-Covered Loans | Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non- Accrual Loans		7	[5]	6	[6]
Total Loans Receivable		12,276	[5]	4,035	[6]
Non-Covered Loans | Commercial and Industrial | Total Past Due Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		7	[5]	6	[6]
Non-Covered Loans | Commercial and Industrial | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		12,269	[5]	4,029	[6]
Non-Covered Loans | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non- Accrual Loans		9
Total Loans Receivable		2,252		5
Non-Covered Loans | Other | Financing Receivable, 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		13
Non-Covered Loans | Other | Total Past Due Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		22
Non-Covered Loans | Other | Current Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans		$ 2,230		$ 5

[1] Excludes accrued interest receivable of $292 million and $199 million at December 31, 2022 and December 31, 2021, respectively, which is included in other assets in the Consolidated Statements of Condition.

[2] Includes lease financing receivables, all of which were classified as Pass.

[3] Includes specialty finance loans and leases of $4.4 billion and $3.5 billion, respectively, at December 31, 2022 and December 31, 2021.

[4] Includes lease financing receivables, all of which were classified as Pass.

[5] Includes lease financing receivables, all of which were current.

[6] Includes lease financing receivables, all of which were current.