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Fair Value Measurements - Impaired Loans Remeasured and Reported at Fair Value of Underlying Collateral (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Mar. 31, 2024
Level 2 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Carrying value before allocations	$ 4,243	$ 16,332
Reversal of specific valuation allowance allocations	19
Specific (allocations) reversals of prior allocations		(1,589)
Fair value	4,262	14,743
Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Carrying value before allocations	26,991	16,182
Specific (allocations) reversals of prior allocations	(1,144)	(1,172)
Fair value	$ 25,847	$ 15,010

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