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Goodwill and Intangible Assets - Schedule of Estimated Amortization Expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Acquired Finite-Lived Intangible Assets [Line Items]    
2016 $ 181  
2017 623  
2018 147  
2019 124  
2020 107  
Thereafter 761  
Estimated amortization expense 1,943 $ 2,588
MSRs [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
2016 9  
2017 36  
2018 36  
2019 36  
2020 36  
Thereafter 495  
Estimated amortization expense 648 578
Core deposit intangibles [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
2016 172  
2017 587  
2018 111  
2019 88  
2020 71  
Thereafter 266  
Estimated amortization expense $ 1,295 $ 2,010