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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 |

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- 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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