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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