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Loans and Allowance for Credit Losses - Schedule of Loans on Nonaccrual Status (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Sep. 30, 2025	Mar. 31, 2025
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans end of period	$ 344	$ 1,329
Nonaccrual with no Allowance for Credit Loss	340	1,213
Nonaccrual with allowance for Credit Loss	4	116
Interest Income Recognized During the Period	38	66
Commercial Real Estate Portfolio Segment | Real Estate - Commercial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans end of period	329	359
Nonaccrual with no Allowance for Credit Loss	329	359
Interest Income Recognized During the Period	4	29
Commercial Real Estate Portfolio Segment | Real Estate - Residential
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans end of period	11	150
Nonaccrual with no Allowance for Credit Loss	11	81
Nonaccrual with allowance for Credit Loss		69
Interest Income Recognized During the Period		10
Commercial Non Real Estate Portfolio Segment | Commercial - Non Real Estate
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans end of period		13
Nonaccrual with no Allowance for Credit Loss		5
Nonaccrual with allowance for Credit Loss		8
Consumer Portfolio Segment | Other Consumer
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans end of period		807
Nonaccrual with no Allowance for Credit Loss		768
Nonaccrual with allowance for Credit Loss		39
Interest Income Recognized During the Period		$ 27
Land Development And SIDs Portfolio Segment | Land Development and SIDs
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual loans end of period	4
Nonaccrual with allowance for Credit Loss	4
Interest Income Recognized During the Period	$ 34

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