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Fair Value Measurements - Additional Information (Detail) - USD ($)
2 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Transfers from Level 1 to Level 3 for financial assets $ 0 $ 0 $ 0 $ 0
Transfers from Level 3 to Level 1 for financial assets 0 0 0 0
Transfers from Level 2 to Level 3 for financial assets 0 0 0 0
Transfers from Level 3 to Level 2 for financial assets 0 0 0 0
Transfers from Level 1 to Level 3 for financial liabilities 0 0 0 0
Transfers from Level 3 to Level 1 for financial liabilities 0 0 0 0
Transfers from Level 2 to Level 3 for financial liabilities 0 0 0 0
Transfers from Level 3 to Level 2 for financial liabilities 0 0 0 $ 0
Nonrecurring fair value adjustments on loans held for sale   0    
Temporary impairment charge of mortgage servicing rights $ (710,000) $ (710,000) (710,000)  
Mortgage Servicing Rights [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Temporary impairment charge of mortgage servicing rights     $ (710,000)  
Net Servicing Fee Percentage Servicing Assets 0.26% 0.26% 0.26%  
Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Net Servicing Fee Percentage Servicing Assets 0.26% 0.26% 0.26%  
Minimum [Member] | Mortgage Servicing Rights [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Discount rate used in estimating the fair value of servicing rights     10.50%  
Average range of constant prepayment rates     10.63%  
Deliquency rate used in determning fair value of servicing rights     7.08%  
Minimum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Discount rate used in estimating the fair value of servicing rights     10.50%  
Average range of constant prepayment rates     7.08%  
Maximum [Member] | Mortgage Servicing Rights [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Discount rate used in estimating the fair value of servicing rights     12.91%  
Average range of constant prepayment rates     14.40%  
Deliquency rate used in determning fair value of servicing rights     15.66%  
Maximum [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Discount rate used in estimating the fair value of servicing rights     12.91%  
Average range of constant prepayment rates     15.66%  
Weighted Average [Member] | Mortgage Servicing Rights [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Deliquency rate used in determning fair value of servicing rights     3.78%  
Weighted Average [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Discount rate used in estimating the fair value of servicing rights     10.63%  
Average range of constant prepayment rates     14.40%  
Deliquency rate used in determning fair value of servicing rights     3.78%  
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 0.12% 0.12% 0.12%  
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 0.52% 0.52% 0.52%  
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 0.29% 0.29% 0.29%  
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 0.12% 0.12% 0.12%  
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 0.52% 0.52% 0.52%  
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 0.29% 0.29% 0.29%