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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Mar. 31, 2022
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INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | $ 69,746 | $ 120,499
Less than 12 months, Unrealized Losses | (1,500) | (9,798)
12 months or longer, Estimated Fair Value | 134,268 | 35,740
12 months or longer, Unrealized Losses | (22,635) | (3,351)
Total, Estimated Fair Value | 204,014 | 156,239
Total, Unrealized Losses | (24,135) | (13,149)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 10,995 | 192,642
Less than 12 months, unrealized losses | (431) | (12,552)
12 months or longer, Estimated Fair Value | 199,219 | 40,417
12 months or longer, Unrealized Losses | (33,198) | (4,519)
Total Estimated fair value | 210,214 | 233,059
Total, Unrealized Losses | (33,629) | (17,071)
Municipal securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 6,277 | 32,767
Less than 12 months, Unrealized Losses | (133) | (4,293)
12 months or longer, Estimated Fair Value | 32,797 | 3,282
12 months or longer, Unrealized Losses | (7,479) | (221)
Total, Estimated Fair Value | 39,074 | 36,049
Total, Unrealized Losses | (7,612) | (4,514)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value |  | 5,911
Less than 12 months, unrealized losses |  | (816)
12 months or longer, Estimated Fair Value | 7,485 | 3,036
12 months or longer, Unrealized Losses | (2,859) | (606)
Total Estimated fair value | 7,485 | 8,947
Total, Unrealized Losses | (2,859) | (1,422)
Agency securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 43,451 | 22,288
Less than 12 months, Unrealized Losses | (747) | (1,565)
12 months or longer, Estimated Fair Value | 36,646 | 16,414
12 months or longer, Unrealized Losses | (5,227) | (1,579)
Total, Estimated Fair Value | 80,097 | 38,702
Total, Unrealized Losses | (5,974) | (3,144)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 8,413 | 35,930
Less than 12 months, unrealized losses | (240) | (1,708)
12 months or longer, Estimated Fair Value | 40,437 | 6,897
12 months or longer, Unrealized Losses | (4,851) | (742)
Total Estimated fair value | 48,850 | 42,827
Total, Unrealized Losses | (5,091) | (2,450)
Real estate mortgage investment conduits |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 2,693 | 17,334
Less than 12 months, Unrealized Losses | (97) | (1,310)
12 months or longer, Estimated Fair Value | 26,184 | 15,275
12 months or longer, Unrealized Losses | (5,273) | (1,537)
Total, Estimated Fair Value | 28,877 | 32,609
Total, Unrealized Losses | (5,370) | (2,847)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 2,580 | 26,233
Less than 12 months, unrealized losses | (191) | (1,715)
12 months or longer, Estimated Fair Value | 27,837 | 7,735
12 months or longer, Unrealized Losses | (4,578) | (742)
Total Estimated fair value | 30,417 | 33,968
Total, Unrealized Losses | (4,769) | (2,457)
Residential mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 3,449 | 15,702
Less than 12 months, Unrealized Losses | (147) | (436)
12 months or longer, Estimated Fair Value | 12,022 |
12 months or longer, Unrealized Losses | (894) |
Total, Estimated Fair Value | 15,471 | 15,702
Total, Unrealized Losses | (1,041) | (436)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value | 2 | 111,096
Less than 12 months, unrealized losses |  | (7,160)
12 months or longer, Estimated Fair Value | 106,229 | 17,363
12 months or longer, Unrealized Losses | (17,542) | (1,723)
Total Estimated fair value | 106,231 | 128,459
Total, Unrealized Losses | (17,542) | (8,883)
Other mortgage-backed securities |  |
INVESTMENT SECURITIES |  |
Less than 12 months, Estimated Fair Value | 13,876 | 32,408
Less than 12 months, Unrealized Losses | (376) | (2,194)
12 months or longer, Estimated Fair Value | 26,619 | 769
12 months or longer, Unrealized Losses | (3,762) | (14)
Total, Estimated Fair Value | 40,495 | 33,177
Total, Unrealized Losses | (4,138) | (2,208)
Debt Securities, Held to maturity |  |
Less than 12 months, Estimated fair value |  | 13,472
Less than 12 months, unrealized losses |  | (1,153)
12 months or longer, Estimated Fair Value | 17,231 | 5,386
12 months or longer, Unrealized Losses | (3,368) | (706)
Total Estimated fair value | 17,231 | 18,858
Total, Unrealized Losses | $ (3,368) | $ (1,859)

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