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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Mar. 31, 2021
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value $ 107,119 $ 105,317
Less than 12 months, Unrealized Losses (2,344) (2,460)
12 months or longer, Estimated Fair Value 15,581 2,225
12 months or longer, Unrealized Losses (524) (51)
Total, Estimated Fair Value 122,700 107,542
Total, Unrealized Losses (2,868) (2,511)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 167,559 38,199
Less than 12 months, unrealized losses (2,725) (1,354)
12 months or longer, Estimated Fair Value 11,359  
12 months or longer, Unrealized Losses (309)  
Total Estimated fair value 178,918 38,199
Total, Unrealized Losses (3,034) (1,354)
Municipal securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 29,956 17,529
Less than 12 months, Unrealized Losses (617) (555)
Total, Estimated Fair Value 29,956 17,529
Total, Unrealized Losses (617) (555)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 7,537 9,882
Less than 12 months, unrealized losses (407) (509)
Total Estimated fair value 7,537 9,882
Total, Unrealized Losses (407) (509)
Agency securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 35,205 23,306
Less than 12 months, Unrealized Losses (637) (686)
12 months or longer, Estimated Fair Value 5,774  
12 months or longer, Unrealized Losses (223)  
Total, Estimated Fair Value 40,979 23,306
Total, Unrealized Losses (860) (686)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 25,304 7,468
Less than 12 months, unrealized losses (215) (220)
12 months or longer, Estimated Fair Value 5,950  
12 months or longer, Unrealized Losses (201)  
Total Estimated fair value 31,254 7,468
Total, Unrealized Losses (416) (220)
Real estate mortgage investment conduits    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 22,585 25,462
Less than 12 months, Unrealized Losses (621) (480)
12 months or longer, Estimated Fair Value 8,552  
12 months or longer, Unrealized Losses (286)  
Total, Estimated Fair Value 31,137 25,462
Total, Unrealized Losses (907) (480)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 20,592 9,066
Less than 12 months, unrealized losses (548) (141)
12 months or longer, Estimated Fair Value 2,773  
12 months or longer, Unrealized Losses (82)  
Total Estimated fair value 23,365 9,066
Total, Unrealized Losses (630) (141)
Residential mortgage-backed securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 2,768 33,164
Less than 12 months, Unrealized Losses (31) (614)
Total, Estimated Fair Value 2,768 33,164
Total, Unrealized Losses (31) (614)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 100,070 6,035
Less than 12 months, unrealized losses (1,121) (119)
12 months or longer, Estimated Fair Value 2,636  
12 months or longer, Unrealized Losses (26)  
Total Estimated fair value 102,706 6,035
Total, Unrealized Losses (1,147) (119)
Other mortgage-backed securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 16,605 5,856
Less than 12 months, Unrealized Losses (438) (125)
12 months or longer, Estimated Fair Value 1,255 2,225
12 months or longer, Unrealized Losses (15) (51)
Total, Estimated Fair Value 17,860 8,081
Total, Unrealized Losses (453) (176)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 14,056 5,748
Less than 12 months, unrealized losses (434) (365)
Total Estimated fair value 14,056 5,748
Total, Unrealized Losses $ (434) $ (365)