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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
Dec. 31, 2017
Dec. 31, 2016
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Impaired loans $ 11,602  
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Impaired loans 11,602  
Significant Unobservable Inputs (Level 3) [Member] | Impaired Loans [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Impaired loans 6,957 $ 2,246
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 11,602 11,174
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Impaired loans 6,957 2,246
Fair Value, Measurements, Nonrecurring [Member] | Mortgage Servicing Rights [Member]    
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]    
Impaired loans   11,174
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 $ 6,957 2,246
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   $ 11,174