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Fair Value Measurement - Summary of Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2016
Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unobservable Input Prepayment speeds  
Fair value input appraisal adjustments 17.70% 17.90%
Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value input appraisal adjustments 7.00% 5.00%
Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value input appraisal adjustments 81.00% 79.00%
Impaired Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Estimate $ 26,215 $ 28,141
Unobservable Input Appraisal adjustments  
Fair value input appraisal adjustments 23.80% 22.30%
Impaired Loans [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value input appraisal adjustments 0.00% 0.00%
Impaired Loans [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value input appraisal adjustments 50.00% 60.00%
Foreclosed Real Estate Owned [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Estimate $ 2,316 $ 2,480
Unobservable Input Appraisal adjustments  
Fair value input appraisal adjustments 22.70% 21.30%
Foreclosed Real Estate Owned [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value input appraisal adjustments 20.00% 20.00%
Foreclosed Real Estate Owned [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value input appraisal adjustments 49.00% 46.00%
Mortgage Servicing Rights [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Estimate $ 512 $ 412
Unobservable Input Discount rate  
Fair value input appraisal adjustments 10.30% 10.10%
Mortgage Servicing Rights [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value input appraisal adjustments 6.00% 6.00%
Mortgage Servicing Rights [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value input appraisal adjustments 11.00% 11.00%
Appraisal of Collateral [Member] | Impaired Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Valuation Techniques Appraisal of collateral  
Appraisal of Collateral [Member] | Foreclosed Real Estate Owned [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Valuation Techniques Appraisal of collateral  
Appraisal of Collateral [Member] | Mortgage Servicing Rights [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Valuation Techniques Discounted cash flow