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Investment Securities - Summary of Investment Securities Held to Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Mar. 31, 2025
Schedule of Held-to-Maturity Securities [Line Items]
Held to maturity, Amortized Cost	$ 192	$ 222
Held to maturity, Gross Unrealized Gains	4	4
Held to maturity, Fair Value	196	226
FHLMC Bonds
Schedule of Held-to-Maturity Securities [Line Items]
Held to maturity, Amortized Cost	58	64
Held to maturity, Gross Unrealized Gains	1	2
Held to maturity, Fair Value	59	66
GNMA Bonds
Schedule of Held-to-Maturity Securities [Line Items]
Held to maturity, Amortized Cost	38	46
Held to maturity, Gross Unrealized Gains	1
Held to maturity, Fair Value	39	46
FNMA Bonds
Schedule of Held-to-Maturity Securities [Line Items]
Held to maturity, Amortized Cost	96	112
Held to maturity, Gross Unrealized Gains	2	2
Held to maturity, Fair Value	$ 98	$ 114

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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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