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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Mar. 31, 2024
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value $ 476 $ 534
Less than 12 months, Unrealized Losses   (1)
12 months or longer, Estimated Fair Value 130,277 139,466
12 months or longer, Unrealized Losses (16,694) (21,245)
Total, Estimated Fair Value 130,753 140,000
Total, Unrealized Losses (16,694) (21,246)
Debt Securities, Held to maturity    
12 months or longer, estimated fair value 195,869 195,519
12 months or longer, unrealized losses (26,122) (33,991)
Total estimated fair value 195,869 195,519
Total, unrealized losses (26,122) (33,991)
Municipal securities    
INVESTMENT SECURITIES    
12 months or longer, Estimated Fair Value 30,720 32,748
12 months or longer, Unrealized Losses (5,487) (6,541)
Total, Estimated Fair Value 30,720 32,748
Total, Unrealized Losses (5,487) (6,541)
Debt Securities, Held to maturity    
12 months or longer, estimated fair value 7,845 7,532
12 months or longer, unrealized losses (2,463) (2,789)
Total estimated fair value 7,845 7,532
Total, unrealized losses (2,463) (2,789)
Agency securities    
INVESTMENT SECURITIES    
12 months or longer, Estimated Fair Value 38,981 43,577
12 months or longer, Unrealized Losses (2,929) (4,241)
Total, Estimated Fair Value 38,981 43,577
Total, Unrealized Losses (2,929) (4,241)
Debt Securities, Held to maturity    
12 months or longer, estimated fair value 51,284 49,601
12 months or longer, unrealized losses (2,932) (4,522)
Total estimated fair value 51,284 49,601
Total, unrealized losses (2,932) (4,522)
Real estate mortgage investment conduits    
INVESTMENT SECURITIES    
12 months or longer, Estimated Fair Value 25,044 25,665
12 months or longer, Unrealized Losses (4,929) (5,759)
Total, Estimated Fair Value 25,044 25,665
Total, Unrealized Losses (4,929) (5,759)
Debt Securities, Held to maturity    
12 months or longer, estimated fair value 25,858 26,581
12 months or longer, unrealized losses (4,150) (5,171)
Total estimated fair value 25,858 26,581
Total, unrealized losses (4,150) (5,171)
Residential mortgage-backed securities    
INVESTMENT SECURITIES    
12 months or longer, Estimated Fair Value 10,778 12,073
12 months or longer, Unrealized Losses (570) (971)
Total, Estimated Fair Value 10,778 12,073
Total, Unrealized Losses (570) (971)
Debt Securities, Held to maturity    
12 months or longer, estimated fair value 93,033 94,638
12 months or longer, unrealized losses (14,006) (18,196)
Total estimated fair value 93,033 94,638
Total, unrealized losses (14,006) (18,196)
Other mortgage-backed securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 476 534
Less than 12 months, Unrealized Losses   (1)
12 months or longer, Estimated Fair Value 24,754 25,403
12 months or longer, Unrealized Losses (2,779) (3,733)
Total, Estimated Fair Value 25,230 25,937
Total, Unrealized Losses (2,779) (3,734)
Debt Securities, Held to maturity    
12 months or longer, estimated fair value 17,849 17,167
12 months or longer, unrealized losses (2,571) (3,313)
Total estimated fair value 17,849 17,167
Total, unrealized losses $ (2,571) $ (3,313)