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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Mar. 31, 2025
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value $ 649 $ 418
Less than 12 months, Unrealized Losses (6) (3)
12 months or longer, Estimated Fair Value 115,944 116,898
12 months or longer, Unrealized Losses (14,187) (17,519)
Total, Estimated Fair Value 116,593 117,316
Total, Unrealized Losses (14,193) (17,522)
Debt Securities, Held to maturity    
12 months or longer, Estimated Fair Value 169,312 175,392
12 months or longer, Unrealized Losses (23,447) (27,687)
Total, Estimated Fair Value 169,312 175,392
Total, Unrealized Losses (23,447) (27,687)
Municipal securities    
INVESTMENT SECURITIES    
12 months or longer, Estimated Fair Value 30,667 29,849
12 months or longer, Unrealized Losses (5,081) (6,262)
Total, Estimated Fair Value 30,667 29,849
Total, Unrealized Losses (5,081) (6,262)
Debt Securities, Held to maturity    
12 months or longer, Estimated Fair Value 7,791 7,629
12 months or longer, Unrealized Losses (2,492) (2,667)
Total, Estimated Fair Value 7,791 7,629
Total, Unrealized Losses (2,492) (2,667)
Agency securities    
INVESTMENT SECURITIES    
12 months or longer, Estimated Fair Value 30,934 30,203
12 months or longer, Unrealized Losses (2,019) (2,741)
Total, Estimated Fair Value 30,934 30,203
Total, Unrealized Losses (2,019) (2,741)
Debt Securities, Held to maturity    
12 months or longer, Estimated Fair Value 40,381 39,556
12 months or longer, Unrealized Losses (1,948) (2,723)
Total, Estimated Fair Value 40,381 39,556
Total, Unrealized Losses (1,948) (2,723)
Real estate mortgage investment conduits    
INVESTMENT SECURITIES    
12 months or longer, Estimated Fair Value 22,890 23,490
12 months or longer, Unrealized Losses (4,396) (5,107)
Total, Estimated Fair Value 22,890 23,490
Total, Unrealized Losses (4,396) (5,107)
Debt Securities, Held to maturity    
12 months or longer, Estimated Fair Value 23,276 24,268
12 months or longer, Unrealized Losses (3,552) (4,231)
Total, Estimated Fair Value 23,276 24,268
Total, Unrealized Losses (3,552) (4,231)
Residential mortgage-backed securities    
INVESTMENT SECURITIES    
12 months or longer, Estimated Fair Value 8,580 9,540
12 months or longer, Unrealized Losses (436) (589)
Total, Estimated Fair Value 8,580 9,540
Total, Unrealized Losses (436) (589)
Debt Securities, Held to maturity    
12 months or longer, Estimated Fair Value 83,070 86,485
12 months or longer, Unrealized Losses (13,252) (15,448)
Total, Estimated Fair Value 83,070 86,485
Total, Unrealized Losses (13,252) (15,448)
Other mortgage-backed securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 649 418
Less than 12 months, Unrealized Losses (6) (3)
12 months or longer, Estimated Fair Value 22,873 23,816
12 months or longer, Unrealized Losses (2,255) (2,820)
Total, Estimated Fair Value 23,522 24,234
Total, Unrealized Losses (2,261) (2,823)
Debt Securities, Held to maturity    
12 months or longer, Estimated Fair Value 14,794 17,454
12 months or longer, Unrealized Losses (2,203) (2,618)
Total, Estimated Fair Value 14,794 17,454
Total, Unrealized Losses $ (2,203) $ (2,618)