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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Mar. 31, 2024
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value   $ 534
Less than 12 months, Unrealized Losses   (1)
12 months or longer, Estimated Fair Value $ 133,307 139,466
12 months or longer, Unrealized Losses (21,561) (21,245)
Total, Estimated Fair Value 133,307 140,000
Total, Unrealized Losses (21,561) (21,246)
Debt Securities, Held to maturity    
12 months or longer, estimated fair value 192,026 195,519
12 months or longer, unrealized losses (33,791) (33,991)
Total estimated fair value 192,026 195,519
Total, unrealized losses (33,791) (33,991)
Municipal securities    
INVESTMENT SECURITIES    
12 months or longer, Estimated Fair Value 32,394 32,748
12 months or longer, Unrealized Losses (6,867) (6,541)
Total, Estimated Fair Value 32,394 32,748
Total, Unrealized Losses (6,867) (6,541)
Debt Securities, Held to maturity    
12 months or longer, estimated fair value 7,422 7,532
12 months or longer, unrealized losses (2,892) (2,789)
Total estimated fair value 7,422 7,532
Total, unrealized losses (2,892) (2,789)
Agency securities    
INVESTMENT SECURITIES    
12 months or longer, Estimated Fair Value 40,814 43,577
12 months or longer, Unrealized Losses (4,060) (4,241)
Total, Estimated Fair Value 40,814 43,577
Total, Unrealized Losses (4,060) (4,241)
Debt Securities, Held to maturity    
12 months or longer, estimated fair value 49,888 49,601
12 months or longer, unrealized losses (4,281) (4,522)
Total estimated fair value 49,888 49,601
Total, unrealized losses (4,281) (4,522)
Real estate mortgage investment conduits    
INVESTMENT SECURITIES    
12 months or longer, Estimated Fair Value 24,672 25,665
12 months or longer, Unrealized Losses (6,005) (5,759)
Total, Estimated Fair Value 24,672 25,665
Total, Unrealized Losses (6,005) (5,759)
Debt Securities, Held to maturity    
12 months or longer, estimated fair value 25,694 26,581
12 months or longer, unrealized losses (5,228) (5,171)
Total estimated fair value 25,694 26,581
Total, unrealized losses (5,228) (5,171)
Residential mortgage-backed securities    
INVESTMENT SECURITIES    
12 months or longer, Estimated Fair Value 11,101 12,073
12 months or longer, Unrealized Losses (921) (971)
Total, Estimated Fair Value 11,101 12,073
Total, Unrealized Losses (921) (971)
Debt Securities, Held to maturity    
12 months or longer, estimated fair value 91,829 94,638
12 months or longer, unrealized losses (18,126) (18,196)
Total estimated fair value 91,829 94,638
Total, unrealized losses (18,126) (18,196)
Other mortgage-backed securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value   534
Less than 12 months, Unrealized Losses   (1)
12 months or longer, Estimated Fair Value 24,326 25,403
12 months or longer, Unrealized Losses (3,708) (3,733)
Total, Estimated Fair Value 24,326 25,937
Total, Unrealized Losses (3,708) (3,734)
Debt Securities, Held to maturity    
12 months or longer, estimated fair value 17,193 17,167
12 months or longer, unrealized losses (3,264) (3,313)
Total estimated fair value 17,193 17,167
Total, unrealized losses $ (3,264) $ (3,313)