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Fair Value - Quantitative Information about Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on Non Recurring Basis (Detail) - Fair Value, Measurements, Non Recurring - Significant Unobservable Inputs (Level 3)
$ in Thousands
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Commercial, industrial, and agricultural    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value $ 2,910 $ 2,055
Commercial, industrial, and agricultural | Measurement Input, Loss Severity | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Valuation technique 0.00 0.20
Commercial, industrial, and agricultural | Measurement Input, Loss Severity | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Valuation technique 1.00 0.60
Commercial, industrial, and agricultural | Measurement Input, Loss Severity | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Valuation technique 0.54 0.34
Commercial mortgages    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value $ 1,147 $ 679
Commercial mortgages | Measurement Input, Loss Severity | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Valuation technique 0.25 0.15
Commercial mortgages | Measurement Input, Loss Severity | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Valuation technique 1.00 0.39
Commercial mortgages | Measurement Input, Loss Severity | Weighted Average    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Valuation technique 0.52 0.33