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Borrowings - FHLB advances (Details) - USD ($)
Dec. 31, 2024
Mar. 31, 2024
Borrowings    
Amount $ 1,000,000 $ 3,000,000
Maturities of FHLB advances    
Within one year 1,000,000  
Federal Home Loan Bank advances 1,000,000 3,000,000
Additional disclosures    
Collateral pledge to the FHLB 68,929,000 67,719,000
Total amount eligible to borrow $ 44,381,000 $ 44,887,000
FHLB advances, Maturity March 31, 2026, Interest rate 4.90%    
Borrowings    
Interest Rate 4.90%  
Amount $ 1,000,000  
FHLB advances, Maturity March 31, 2025, Interest rate 1.64%    
Borrowings    
Interest Rate   1.64%
Amount   $ 1,000,000
FHLB advances, Maturity March 31, 2025, Interest rate 5.75%    
Borrowings    
Interest Rate   5.75%
Amount   $ 1,000,000
FHLB advances, Maturity March 31, 2026, Interest rate 5.90%    
Borrowings    
Interest Rate   5.90%
Amount   $ 1,000,000