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Fair Value - Summary of Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of Other Real Estate Owned Measured at Fair Value on a Nonrecurring Basis Table [Line Items] |  |
Loans held for sale | $ 178,598 | $ 55,646
Fair Value, Nonrecurring [Member] |  |
Disclosure of Other Real Estate Owned Measured at Fair Value on a Nonrecurring Basis Table [Line Items] |  |
Impaired loans, net | 2,187 | 1,167
Loans held for sale | 178,598 | 55,646
Fair Value, Nonrecurring [Member] | Level 2 [Member] |  |
Disclosure of Other Real Estate Owned Measured at Fair Value on a Nonrecurring Basis Table [Line Items] |  |
Loans held for sale | 178,598 | 55,646
Fair Value, Nonrecurring [Member] | Level 3 [Member] |  |
Disclosure of Other Real Estate Owned Measured at Fair Value on a Nonrecurring Basis Table [Line Items] |  |
Impaired loans, net | $ 2,187 | $ 1,167

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