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Goodwill and Intangible Assets - Schedule of Acquired Intangible Assets (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 8,147 | $ 7,996
Accumulated Amortization | 6,204 | 5,408
Estimated amortization expense | 1,943 | 2,588
MSRs [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 873 | 722
Accumulated Amortization | 225 | 144
Estimated amortization expense | 648 | 578
Core deposit intangibles [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 7,274 | 7,274
Accumulated Amortization | 5,979 | 5,264
Estimated amortization expense | $ 1,295 | $ 2,010

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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