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Goodwill and Intangible Assets - Schedule of Acquired Intangible Assets, Other than Goodwill (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Mar. 31, 2016
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Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 8,212 | $ 8,055
Accumulated Amortization | 6,580 | 5,813
Estimated amortization expense | 1,632 | 2,242
MSRs [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 938 | 781
Accumulated Amortization | 261 | 177
Estimated amortization expense | 677 | 604
Core deposit intangibles [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 7,274 | 7,274
Accumulated Amortization | 6,319 | 5,636
Estimated amortization expense | $ 955 | $ 1,638

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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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