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Disclosures about Fair Value of Assets and Liabilities - Other Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Impaired loans $ 5,318 $ 5,661
Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Impaired loans 13,366 12,349
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Impaired loans 5,318 5,661
Fair Value, Measurements, Nonrecurring [Member] | Mortgage Servicing Rights [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Impaired loans 13,366 12,349
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Impaired loans 5,318 5,661
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Impaired loans $ 13,366 $ 12,349