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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Mar. 31, 2021
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value $ 120,499 $ 105,317
Less than 12 months, Unrealized Losses (9,798) (2,460)
12 months or longer, Estimated Fair Value 35,740 2,225
12 months or longer, Unrealized Losses (3,351) (51)
Total, Estimated Fair Value 156,239 107,542
Total, Unrealized Losses (13,149) (2,511)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 192,642 38,199
Less than 12 months, unrealized losses (12,552) (1,354)
12 months or longer, Estimated Fair Value 40,417  
12 months or longer, Unrealized Losses (4,519)  
Total Estimated fair value 233,059 38,199
Total, Unrealized Losses (17,071) (1,354)
Municipal securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 32,767 17,529
Less than 12 months, Unrealized Losses (4,293) (555)
12 months or longer, Estimated Fair Value 3,282  
12 months or longer, Unrealized Losses (221)  
Total, Estimated Fair Value 36,049 17,529
Total, Unrealized Losses (4,514) (555)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 5,911 9,882
Less than 12 months, unrealized losses (816) (509)
12 months or longer, Estimated Fair Value 3,036  
12 months or longer, Unrealized Losses (606)  
Total Estimated fair value 8,947 9,882
Total, Unrealized Losses (1,422) (509)
Agency securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 22,288 23,306
Less than 12 months, Unrealized Losses (1,565) (686)
12 months or longer, Estimated Fair Value 16,414  
12 months or longer, Unrealized Losses (1,579)  
Total, Estimated Fair Value 38,702 23,306
Total, Unrealized Losses (3,144) (686)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 35,930 7,468
Less than 12 months, unrealized losses (1,708) (220)
12 months or longer, Estimated Fair Value 6,897  
12 months or longer, Unrealized Losses (742)  
Total Estimated fair value 42,827 7,468
Total, Unrealized Losses (2,450) (220)
Real estate mortgage investment conduits    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 17,334 25,462
Less than 12 months, Unrealized Losses (1,310) (480)
12 months or longer, Estimated Fair Value 15,275  
12 months or longer, Unrealized Losses (1,537)  
Total, Estimated Fair Value 32,609 25,462
Total, Unrealized Losses (2,847) (480)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 26,233 9,066
Less than 12 months, unrealized losses (1,715) (141)
12 months or longer, Estimated Fair Value 7,735  
12 months or longer, Unrealized Losses (742)  
Total Estimated fair value 33,968 9,066
Total, Unrealized Losses (2,457) (141)
Residential mortgage-backed securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 15,702 33,164
Less than 12 months, Unrealized Losses (436) (614)
Total, Estimated Fair Value 15,702 33,164
Total, Unrealized Losses (436) (614)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 111,096 6,035
Less than 12 months, unrealized losses (7,160) (119)
12 months or longer, Estimated Fair Value 17,363  
12 months or longer, Unrealized Losses (1,723)  
Total Estimated fair value 128,459 6,035
Total, Unrealized Losses (8,883) (119)
Other mortgage-backed securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 32,408 5,856
Less than 12 months, Unrealized Losses (2,194) (125)
12 months or longer, Estimated Fair Value 769 2,225
12 months or longer, Unrealized Losses (14) (51)
Total, Estimated Fair Value 33,177 8,081
Total, Unrealized Losses (2,208) (176)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 13,472 5,748
Less than 12 months, unrealized losses (1,153) (365)
12 months or longer, Estimated Fair Value 5,386  
12 months or longer, Unrealized Losses (706)  
Total Estimated fair value 18,858 5,748
Total, Unrealized Losses $ (1,859) $ (365)