Loans and Leases - Portfolio of Loans Held for Investment by Credit Quality Indicator (Details) - USD ($) $ in Millions		Dec. 31, 2022		Dec. 31, 2021
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	$ 69,001		$ 45,738
Multi-Family
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		38,130		34,628
Multi-Family | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		36,622		33,035
Multi-Family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		864		982
Multi-Family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		644		611
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		8,526		6,701
Commercial Real Estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		7,871		5,876
Commercial Real Estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		230		644
Commercial Real Estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		425		181
One-to-Four Family
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		5,821		160
One-to-Four Family | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		5,710		137
One-to-Four Family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		8		14
One-to-Four Family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		103		9
Acquisition, Development, and Construction
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,996		209
Acquisition, Development, and Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,992		204
Acquisition, Development, and Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		4		5
Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	54,473		41,698
Mortgage Receivable | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		52,195		39,252
Mortgage Receivable | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,106		1,645
Mortgage Receivable | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,172		801
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[3]	12,276	[2]	4,034	[4]
Commercial and Industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		12,208	[2]	3,987	[4]
Commercial and Industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		18	[2]	2	[4]
Commercial and Industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		50	[2]	45	[4]
Other
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		2,252		6
Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		2,238		6
Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		14
Total Other Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		14,528		4,040
Total Other Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		14,446		3,993
Total Other Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		18		2
Total Other Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		$ 64		$ 45

[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.