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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Mar. 31, 2023
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value $ 7,113 $ 69,746
Less than 12 months, Unrealized Losses (20) (1,500)
12 months or longer, Estimated Fair Value 186,188 134,268
12 months or longer, Unrealized Losses (23,004) (22,635)
Total, Estimated Fair Value 193,301 204,014
Total, Unrealized Losses (23,024) (24,135)
Debt Securities, Held to maturity    
12 months or longer, estimated fair value 200,475  
12 months or longer, unrealized losses (32,184)  
Total estimated fair value 200,475  
Total, unrealized losses (32,184)  
Less than 12 months, Estimated fair value   10,995
Less than 12 months, unrealized losses   (431)
12 months or longer, Estimated Fair Value   199,219
12 months or longer, Unrealized Losses   (33,198)
Total Estimated fair value   210,214
Total, Unrealized Losses   (33,629)
Municipal securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 448 6,277
Less than 12 months, Unrealized Losses (1) (133)
12 months or longer, Estimated Fair Value 37,463 32,797
12 months or longer, Unrealized Losses (7,460) (7,479)
Total, Estimated Fair Value 37,911 39,074
Total, Unrealized Losses (7,461) (7,612)
Debt Securities, Held to maturity    
12 months or longer, estimated fair value 7,530  
12 months or longer, unrealized losses (2,796)  
Total estimated fair value 7,530  
Total, unrealized losses (2,796)  
12 months or longer, Estimated Fair Value   7,485
12 months or longer, Unrealized Losses   (2,859)
Total Estimated fair value   7,485
Total, Unrealized Losses   (2,859)
Agency securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 5,819 43,451
Less than 12 months, Unrealized Losses (17) (747)
12 months or longer, Estimated Fair Value 78,173 36,646
12 months or longer, Unrealized Losses (5,197) (5,227)
Total, Estimated Fair Value 83,992 80,097
Total, Unrealized Losses (5,214) (5,974)
Debt Securities, Held to maturity    
12 months or longer, estimated fair value 49,784  
12 months or longer, unrealized losses (4,293)  
Total estimated fair value 49,784  
Total, unrealized losses (4,293)  
Less than 12 months, Estimated fair value   8,413
Less than 12 months, unrealized losses   (240)
12 months or longer, Estimated Fair Value   40,437
12 months or longer, Unrealized Losses   (4,851)
Total Estimated fair value   48,850
Total, Unrealized Losses   (5,091)
Real estate mortgage investment conduits    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value   2,693
Less than 12 months, Unrealized Losses   (97)
12 months or longer, Estimated Fair Value 26,420 26,184
12 months or longer, Unrealized Losses (5,601) (5,273)
Total, Estimated Fair Value 26,420 28,877
Total, Unrealized Losses (5,601) (5,370)
Debt Securities, Held to maturity    
12 months or longer, estimated fair value 27,507  
12 months or longer, unrealized losses (5,031)  
Total estimated fair value 27,507  
Total, unrealized losses (5,031)  
Less than 12 months, Estimated fair value   2,580
Less than 12 months, unrealized losses   (191)
12 months or longer, Estimated Fair Value   27,837
12 months or longer, Unrealized Losses   (4,578)
Total Estimated fair value   30,417
Total, Unrealized Losses   (4,769)
Residential mortgage-backed securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value   3,449
Less than 12 months, Unrealized Losses   (147)
12 months or longer, Estimated Fair Value 12,872 12,022
12 months or longer, Unrealized Losses (898) (894)
Total, Estimated Fair Value 12,872 15,471
Total, Unrealized Losses (898) (1,041)
Debt Securities, Held to maturity    
12 months or longer, estimated fair value 98,382  
12 months or longer, unrealized losses (16,831)  
Total estimated fair value 98,382  
Total, unrealized losses (16,831)  
Less than 12 months, Estimated fair value   2
12 months or longer, Estimated Fair Value   106,229
12 months or longer, Unrealized Losses   (17,542)
Total Estimated fair value   106,231
Total, Unrealized Losses   (17,542)
Other mortgage-backed securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 846 13,876
Less than 12 months, Unrealized Losses (2) (376)
12 months or longer, Estimated Fair Value 31,260 26,619
12 months or longer, Unrealized Losses (3,848) (3,762)
Total, Estimated Fair Value 32,106 40,495
Total, Unrealized Losses (3,850) (4,138)
Debt Securities, Held to maturity    
12 months or longer, estimated fair value 17,272  
12 months or longer, unrealized losses (3,233)  
Total estimated fair value 17,272  
Total, unrealized losses $ (3,233)  
12 months or longer, Estimated Fair Value   17,231
12 months or longer, Unrealized Losses   (3,368)
Total Estimated fair value   17,231
Total, Unrealized Losses   $ (3,368)