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Fair Value - Summary of Quantitative Information about Level 3 Fair Value Measurements (Detail) - Fair Value, Nonrecurring [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Other Real Estate Owned Measured on Nonrecurring Vasis Valuation Techniques [Line Items]    
Impaired loans, net $ 2,187 $ 1,167
Selling Costs [Member]    
Disclosure of Other Real Estate Owned Measured on Nonrecurring Vasis Valuation Techniques [Line Items]    
Impaired loans, net $ 2,097 $ 1,167
Valuation Technique Discounted appraised value Discounted appraised value
Unobservable Input Selling costs Selling costs
Weighted Average 10.00% 10.00%
Discount Rate [Member]    
Disclosure of Other Real Estate Owned Measured on Nonrecurring Vasis Valuation Techniques [Line Items]    
Impaired loans, net $ 90  
Valuation Technique Discounted cash flows  
Unobservable Input Discount rate  
Weighted Average 6.00%