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Fair Value Measurements - Foreclosed Assets Remeasured and Reported at Fair Value (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreclosed Assets Remeasured at Initial Recognition Carrying Value Of Foreclosed Assets Prior To Remeasurement | $ 1,302 | $ 2,898
Foreclosed Assets Remeasured at Initial Recognition Charge-offs recognized in the allowance for loan losses | (76) | 0
Fair Value of Foreclosed Assets Remeasured at Initial Recognition | 1,226 | 2,898
Foreclosed Assets Remeasured Subsequent to initial Recognition Carrying value of foreclosed assets prior to remeasurement | 0 | 1,823
Foreclosed Assets Remeasured Subsequent to Initial Recognition Write-downs included in other non-interest expense | 0 | (473)
Fair Value of Foreclosed Assets remeasured subsequent to initial recognition | $ 0 | $ 1,350

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