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Loans and Leases - Composition of Loan and Lease Portfolio (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans | [1] | $ 46,703 |  | $ 45,681 |  |  |
Non-Covered Loans, Percentage | [1] | 100.00% |  | 100.00% |  |  |
Net deferred loan origination costs |  | $ 55 |  | $ 57 |  |  |
Allowance for loan and lease losses |  | (197) |  | (199) |  | $ (198) | $ (194)
Total loans and leases, net |  | 46,561 |  | 45,539 |  |  |
Multi-Family |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 35,751 |  | $ 34,603 |  |  |
Non-Covered Loans, Percentage |  | 76.55% |  | 75.75% |  |  |
Commercial Real Estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 6,701 |  | $ 6,698 |  |  |
Non-Covered Loans, Percentage |  | 14.35% |  | 14.66% |  |  |
One-to-Four Family |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 145 |  | $ 160 |  |  |
Non-Covered Loans, Percentage |  | 0.31% |  | 0.35% |  |  |
Acquisition, Development, and Construction |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 237 |  | $ 209 |  |  |
Non-Covered Loans, Percentage |  | 0.51% |  | 0.46% |  |  |
Mortgage Receivable |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans | [1] | $ 42,834 |  | $ 41,670 |  |  |
Non-Covered Loans, Percentage | [1] | 91.72% |  | 91.22% |  |  |
Allowance for loan and lease losses |  | $ (176) |  | $ (178) |  | $ (176) | $ (176)
Commercial and Industrial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans | [3] | $ 3,863 | [2] | $ 4,006 | [4] |  |
Non-Covered Loans, Percentage | [3] | 8.27% |  | 8.77% |  |  |
Commercial and Industrial | Other Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 2,200 |  | $ 2,236 |  |  |
Non-Covered Loans, Percentage |  | 4.71% |  | 4.89% |  |  |
Lease Financing, Unearned Income |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 1,663 |  | $ 1,770 |  |  |
Non-Covered Loans, Percentage |  | 3.57% |  | 3.88% |  |  |
Other |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 6 |  | $ 5 |  |  |
Non-Covered Loans, Percentage |  | 0.01% |  | 0.01% |  |  |
Total Other Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 3,869 |  | $ 4,011 |  |  |
Total Other Loans | Other Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 3,869 |  | $ 4,011 |  |  |
Non-Covered Loans, Percentage |  | 8.28% |  | 8.78% |  |  |
[1] | Excludes accrued interest receivable of $200 million and $199 million at March 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 $3.3 billion and $3.5 billion, respectively, at March 31, 2022 and December 31, 2021, and other C&I loans of $548 million and $527 million, respectively, at March 31, 2022 and December 31, 2021.
[4] | Includes lease financing receivables, all of which were classified as Pass.

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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