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Fair Value Measurements - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Transfers from Level 1 to Level 3 for financial assets $ 0 $ 0
Transfers from Level 3 to Level 1 for financial assets 0 0
Transfers from Level 2 to Level 3 for financial assets 0 0
Transfers from Level 3 to Level 2 for financial assets 0 0
Transfers from Level 1 to Level 3 for financial liabilities 0 0
Transfers from Level 3 to Level 1 for financial liabilities 0 0
Transfers from Level 2 to Level 3 for financial liabilities 0 0
Transfers from Level 3 to Level 2 for financial liabilities 0 0
Nonrecurring fair value adjustments on loans held for sale 0  
Fair value measurement of intangible assets $ 0 $ 0
Loans Held For Sale [Member] | Minimum [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Sales price of loans held for sale increase percentage 0.16%  
Loans Held For Sale [Member] | Maximum [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Sales price of loans held for sale increase percentage 0.71%  
Loans Held For Sale [Member] | Weighted Average [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Sales price of loans held for sale increase percentage 0.33%  
Derivatives [Member] | Minimum [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Sales price of loans held for sale increase percentage 0.16%  
Derivatives [Member] | Maximum [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Sales price of loans held for sale increase percentage 0.71%  
Derivatives [Member] | Weighted Average [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Sales price of loans held for sale increase percentage 0.33%