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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
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