Investment Securities, Municipal Securities by Credit Rating (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024
Held-to-Maturity [Abstract]
Amortized cost	$ 77,211	$ 78,790
AAA/AA/A Rating [Member]
Held-to-Maturity [Abstract]
Amortized cost	19,641	20,203
BBB/BB/B Rating [Member]
Held-to-Maturity [Abstract]
Amortized cost	399	395
Not Rated [Member]
Held-to-Maturity [Abstract]
Amortized cost	57,171	58,192
Municipal Securities [Member]
Held-to-Maturity [Abstract]
Amortized cost	77,211	78,790
Past due principal or interest payments of securities	0
Municipal Securities [Member] | AAA/AA/A Rating [Member]
Held-to-Maturity [Abstract]
Amortized cost	19,641	20,203
Municipal Securities [Member] | BBB/BB/B Rating [Member]
Held-to-Maturity [Abstract]
Amortized cost	399	395
Municipal Securities [Member] | Not Rated [Member]
Held-to-Maturity [Abstract]
Amortized cost	$ 57,171	$ 58,192