Fair Value Measurements - Foreclosed Assets Remeasured and Reported at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed Assets Remeasured Subsequent to initial Recognition Carrying value of foreclosed assets prior to remeasurement	$ 0	$ 328
Foreclosed Assets Remeasured Subsequent to Initial Recognition Write-downs included in other non-interest expense	0	(231)
Fair Value of Foreclosed Assets remeasured subsequent to initial recognition	$ 0	$ 97

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