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Fair Value Measurements and Disclosures - Schedule of Significant Unobservable Inputs Used in Fair Value Measurement of Level 3 Assets (Detail) - Nonrecurring - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Impaired loans $ 7,365 $ 8,723
Foreclosed assets and ORE 4,156 1,558
Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Impaired loans 7,365 8,723
Foreclosed assets and ORE $ 4,156 $ 1,558
Level 3 | Minimum | Collateral discounts and discount rates    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral discounts and discount rates (percent) 0.00% 0.00%
Level 3 | Minimum | Collateral discounts and estimated costs to sell    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral discounts and estimated costs to sell (percent) 6.00% 6.00%
Level 3 | Maximum | Collateral discounts and discount rates    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral discounts and discount rates (percent) 84.00% 100.00%
Level 3 | Maximum | Collateral discounts and estimated costs to sell    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral discounts and estimated costs to sell (percent) 61.00% 68.00%
Level 3 | Weighted Average | Collateral discounts and discount rates    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral discounts and discount rates (percent) 13.00% 12.00%
Level 3 | Weighted Average | Collateral discounts and estimated costs to sell    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Collateral discounts and estimated costs to sell (percent) 14.00% 20.00%