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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Mar. 31, 2021
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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)

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