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Derivatives - Fair Value of Derivative Contracts (Detail) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Assets | $ 25,507,000 | $ 41,488,000
Liabilities | 11,953,000 | 17,948,000
Notional amounts | 1,476,389,000 | 1,830,454,000
Rate lock commitments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Assets | 9,048,000 | 21,034,000
Liabilities | 5,471,000 | 2,977,000
Notional amounts | 242,615,000 | 296,972,000
Nasdaq Forwards |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Assets | 7,220,000 | 12,822,000
Liabilities | 0 | 0
Notional amounts | 174,000,000 | 174,000,000
Forward sale contracts |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Assets | 9,239,000 | 7,632,000
Liabilities | 6,482,000 | 14,971,000
Notional amounts | $ 1,059,774,000 | $ 1,359,482,000

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