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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Mar. 31, 2022
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value $ 127,962 $ 120,499
Less than 12 months, Unrealized Losses (13,949) (9,798)
12 months or longer, Estimated Fair Value 41,041 35,740
12 months or longer, Unrealized Losses (5,701) (3,351)
Total, Estimated Fair Value 169,003 156,239
Total, Unrealized Losses (19,650) (13,149)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 187,524 192,642
Less than 12 months, unrealized losses (19,167) (12,552)
12 months or longer, Estimated Fair Value 42,063 40,417
12 months or longer, Unrealized Losses (7,246) (4,519)
Total Estimated fair value 229,587 233,059
Total, Unrealized Losses (26,413) (17,071)
Municipal securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 35,265 32,767
Less than 12 months, Unrealized Losses (6,967) (4,293)
12 months or longer, Estimated Fair Value 3,033 3,282
12 months or longer, Unrealized Losses (450) (221)
Total, Estimated Fair Value 38,298 36,049
Total, Unrealized Losses (7,417) (4,514)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 5,167 5,911
Less than 12 months, unrealized losses (1,557) (816)
12 months or longer, Estimated Fair Value 2,672 3,036
12 months or longer, Unrealized Losses (965) (606)
Total Estimated fair value 7,839 8,947
Total, Unrealized Losses (2,522) (1,422)
Agency securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 27,417 22,288
Less than 12 months, Unrealized Losses (2,300) (1,565)
12 months or longer, Estimated Fair Value 15,955 16,414
12 months or longer, Unrealized Losses (2,039) (1,579)
Total, Estimated Fair Value 43,372 38,702
Total, Unrealized Losses (4,339) (3,144)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 43,628 35,930
Less than 12 months, unrealized losses (2,551) (1,708)
12 months or longer, Estimated Fair Value 6,627 6,897
12 months or longer, Unrealized Losses (1,001) (742)
Total Estimated fair value 50,255 42,827
Total, Unrealized Losses (3,552) (2,450)
Real estate mortgage investment conduits    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 11,794 17,334
Less than 12 months, Unrealized Losses (853) (1,310)
12 months or longer, Estimated Fair Value 21,345 15,275
12 months or longer, Unrealized Losses (3,202) (1,537)
Total, Estimated Fair Value 33,139 32,609
Total, Unrealized Losses (4,055) (2,847)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 25,178 26,233
Less than 12 months, unrealized losses (2,117) (1,715)
12 months or longer, Estimated Fair Value 9,321 7,735
12 months or longer, Unrealized Losses (1,365) (742)
Total Estimated fair value 34,499 33,968
Total, Unrealized Losses (3,482) (2,457)
Residential mortgage-backed securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 15,327 15,702
Less than 12 months, Unrealized Losses (619) (436)
Total, Estimated Fair Value 15,327 15,702
Total, Unrealized Losses (619) (436)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 100,666 111,096
Less than 12 months, unrealized losses (11,220) (7,160)
12 months or longer, Estimated Fair Value 18,325 17,363
12 months or longer, Unrealized Losses (2,945) (1,723)
Total Estimated fair value 118,991 128,459
Total, Unrealized Losses (14,165) (8,883)
Other mortgage-backed securities    
INVESTMENT SECURITIES    
Less than 12 months, Estimated Fair Value 38,159 32,408
Less than 12 months, Unrealized Losses (3,210) (2,194)
12 months or longer, Estimated Fair Value 708 769
12 months or longer, Unrealized Losses (10) (14)
Total, Estimated Fair Value 38,867 33,177
Total, Unrealized Losses (3,220) (2,208)
Debt Securities, Held to maturity    
Less than 12 months, Estimated fair value 12,885 13,472
Less than 12 months, unrealized losses (1,722) (1,153)
12 months or longer, Estimated Fair Value 5,118 5,386
12 months or longer, Unrealized Losses (970) (706)
Total Estimated fair value 18,003 18,858
Total, Unrealized Losses $ (2,692) $ (1,859)