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Commitments and Contingencies - Off-Balance-Sheet Originate Loans and Letters of Credit (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Commitments	$ 2,851,096
Total loan commitments
Loss Contingencies [Line Items]
Commitments	2,475,220	$ 2,000,000
Commercial, performance stand-by, and financial stand-by letters of credit
Loss Contingencies [Line Items]
Commitments	375,876	$ 509,900
Multi-family and commercial real estate
Loss Contingencies [Line Items]
Commitments	411,661
Multi-family and commercial real estate | Multifamily And Commercial Real Estate Loans
Loss Contingencies [Line Items]
Commitments	310,261
Multi-family and commercial real estate | One-to-Four Family
Loss Contingencies [Line Items]
Commitments	801
Multi-family and commercial real estate | Acquisition, Development, and Construction
Loss Contingencies [Line Items]
Commitments	100,599
Other loan commitments
Loss Contingencies [Line Items]
Commitments	$ 2,063,559

X

- Definition

Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(25))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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- Definition

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+ References

No definition available.

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