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Fair Value Measurements and Disclosures about Fair Value of Financial Instruments (Additional information) (Detail)
3 Months Ended
Dec. 31, 2018
USD ($)
Number
Sep. 30, 2018
Dec. 31, 2017
USD ($)
Foreclosed Real Estate Expense | $ $ 10,000    
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Earnings | $ 658,000   $ 0
Impaired Loans [Member]      
Foreclosed Real Estate Expense | $ $ 194,000   $ 2,000
Maximum [Member] | Measurement Input, Discount Rate [Member]      
Other Real Estate Owned, Measurement Input | Number 18.4    
Maximum [Member] | Foreclosed Real Estate Held [Member] | Measurement Input, Discount Rate [Member]      
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 100.00%    
Maximum [Member] | Collateral [Member] | Measurement Input, Discount Rate [Member]      
Fair Value Inputs Discount Rate   6.00%  
Maximum [Member] | Impaired Loans [Member] | Measurement Input, Discount Rate [Member]      
Fair Value Inputs Discount Rate 15.00%    
Maximum [Member] | Loan Servicing Rights [Member] | Measurement Input, Discount Rate [Member]      
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 21.19% 23.22%  
Maximum [Member] | Loan Servicing Rights [Member] | Measurement Input, Constant Prepayment Rate [Member]      
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 16.38% 14.43%  
Minimum [Member] | Measurement Input, Discount Rate [Member]      
Other Real Estate Owned, Measurement Input | Number 15.0    
Minimum [Member] | Foreclosed Real Estate Held [Member] | Measurement Input, Discount Rate [Member]      
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 15.00%    
Minimum [Member] | Collateral [Member] | Measurement Input, Discount Rate [Member]      
Fair Value Inputs Discount Rate   0.00%  
Minimum [Member] | Impaired Loans [Member] | Measurement Input, Discount Rate [Member]      
Fair Value Inputs Discount Rate 0.00%    
Minimum [Member] | Loan Servicing Rights [Member] | Measurement Input, Discount Rate [Member]      
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 10.28% 10.84%  
Minimum [Member] | Loan Servicing Rights [Member] | Measurement Input, Constant Prepayment Rate [Member]      
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 5.03% 4.32%  
Weighted Average [Member] | Measurement Input, Discount Rate [Member]      
Other Real Estate Owned, Measurement Input | Number 15.9    
Weighted Average [Member] | Foreclosed Real Estate Held [Member] | Measurement Input, Discount Rate [Member]      
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 48.90%    
Weighted Average [Member] | Loan Servicing Rights [Member] | Measurement Input, Discount Rate [Member]      
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 13.10% 14.63%  
Weighted Average [Member] | Loan Servicing Rights [Member] | Measurement Input, Constant Prepayment Rate [Member]      
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 11.18% 10.08%