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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Mar. 31, 2022
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INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | $ 126,340 | $ 120,499
Less than 12 months, Unrealized Losses | (10,530) | (9,798)
12 months or longer, Estimated Fair Value | 82,117 | 35,740
12 months or longer, Unrealized Losses | (19,034) | (3,351)
Total, Estimated Fair Value | 208,457 | 156,239
Total, Unrealized Losses | (29,564) | (13,149)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 116,487 | 192,642
Less than 12 months, unrealized losses | (17,094) | (12,552)
12 months or longer, Estimated Fair Value | 95,002 | 40,417
12 months or longer, Unrealized Losses | (22,431) | (4,519)
Total Estimated fair value | 211,489 | 233,059
Total, Unrealized Losses | (39,525) | (17,071)
Municipal securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 18,343 | 32,767
Less than 12 months, Unrealized Losses | (4,024) | (4,293)
12 months or longer, Estimated Fair Value | 18,397 | 3,282
12 months or longer, Unrealized Losses | (6,017) | (221)
Total, Estimated Fair Value | 36,740 | 36,049
Total, Unrealized Losses | (10,041) | (4,514)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 2,594 | 5,911
Less than 12 months, unrealized losses | (1,098) | (816)
12 months or longer, Estimated Fair Value | 4,425 | 3,036
12 months or longer, Unrealized Losses | (2,239) | (606)
Total Estimated fair value | 7,019 | 8,947
Total, Unrealized Losses | (3,337) | (1,422)
Agency securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 56,425 | 22,288
Less than 12 months, Unrealized Losses | (2,326) | (1,565)
12 months or longer, Estimated Fair Value | 27,801 | 16,414
12 months or longer, Unrealized Losses | (5,079) | (1,579)
Total, Estimated Fair Value | 84,226 | 38,702
Total, Unrealized Losses | (7,405) | (3,144)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 36,346 | 35,930
Less than 12 months, unrealized losses | (3,695) | (1,708)
12 months or longer, Estimated Fair Value | 11,371 | 6,897
12 months or longer, Unrealized Losses | (2,439) | (742)
Total Estimated fair value | 47,717 | 42,827
Total, Unrealized Losses | (6,134) | (2,450)
Real estate mortgage investment conduits |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 8,081 | 17,334
Less than 12 months, Unrealized Losses | (866) | (1,310)
12 months or longer, Estimated Fair Value | 21,862 | 15,275
12 months or longer, Unrealized Losses | (4,946) | (1,537)
Total, Estimated Fair Value | 29,943 | 32,609
Total, Unrealized Losses | (5,812) | (2,847)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 13,769 | 26,233
Less than 12 months, unrealized losses | (1,492) | (1,715)
12 months or longer, Estimated Fair Value | 17,798 | 7,735
12 months or longer, Unrealized Losses | (3,804) | (742)
Total Estimated fair value | 31,567 | 33,968
Total, Unrealized Losses | (5,296) | (2,457)
Residential mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 14,644 | 15,702
Less than 12 months, Unrealized Losses | (1,186) | (436)
12 months or longer, Estimated Fair Value | 2,159 |
12 months or longer, Unrealized Losses | (265) |
Total, Estimated Fair Value | 16,803 | 15,702
Total, Unrealized Losses | (1,451) | (436)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 56,478 | 111,096
Less than 12 months, unrealized losses | (9,647) | (7,160)
12 months or longer, Estimated Fair Value | 51,853 | 17,363
12 months or longer, Unrealized Losses | (11,294) | (1,723)
Total Estimated fair value | 108,331 | 128,459
Total, Unrealized Losses | (20,941) | (8,883)
Other mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 28,847 | 32,408
Less than 12 months, Unrealized Losses | (2,128) | (2,194)
12 months or longer, Estimated Fair Value | 11,898 | 769
12 months or longer, Unrealized Losses | (2,727) | (14)
Total, Estimated Fair Value | 40,745 | 33,177
Total, Unrealized Losses | (4,855) | (2,208)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 7,300 | 13,472
Less than 12 months, unrealized losses | (1,162) | (1,153)
12 months or longer, Estimated Fair Value | 9,555 | 5,386
12 months or longer, Unrealized Losses | (2,655) | (706)
Total Estimated fair value | 16,855 | 18,858
Total, Unrealized Losses | $ (3,817) | $ (1,859)

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