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INVESTMENT SECURITIES - Unrealized Loss Position (Details) $ in Thousands | Sep. 30, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, fair value | $ 586,175 | $ 1,143,468
Unrealized loss position for less than 12 months, unrealized loss | (908) | (9,278)
Unrealized loss position for more than 12 months, fair value | 2,163,973 | 2,611,155
Unrealized loss position for more than 12 months, unrealized loss | $ (102,112) | $ (141,743)
Investment securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, number of securities in loss position | security | 39 | 91
Unrealized loss position for more than 12 months, number of securities in loss position | security | 148 | 162
Floating interest rate | Floating rate auction-rate certificates backed by Government guaranteed student loans |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, fair value | $ 0 | $ 0
Unrealized loss position for less than 12 months, unrealized loss | 0 | 0
Unrealized loss position for more than 12 months, fair value | 19,478 | 19,082
Unrealized loss position for more than 12 months, unrealized loss | (197) | (591)
Floating interest rate | Guaranteed mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, fair value | 367,575 | 568,759
Unrealized loss position for less than 12 months, unrealized loss | (514) | (4,395)
Unrealized loss position for more than 12 months, fair value | 1,074,472 | 1,449,122
Unrealized loss position for more than 12 months, unrealized loss | (16,690) | (25,254)
Floating interest rate | US Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, fair value | 0 | 49,969
Unrealized loss position for less than 12 months, unrealized loss | 0 | (15)
Unrealized loss position for more than 12 months, fair value | 0 | 0
Unrealized loss position for more than 12 months, unrealized loss | 0 | 0
Fixed Interest Rate | Guaranteed mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, fair value | 24,873 | 384,305
Unrealized loss position for less than 12 months, unrealized loss | (42) | (4,262)
Unrealized loss position for more than 12 months, fair value | 986,007 | 905,759
Unrealized loss position for more than 12 months, unrealized loss | (85,012) | (113,562)
Fixed Interest Rate | US Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, fair value | 193,727 | 140,435
Unrealized loss position for less than 12 months, unrealized loss | (352) | (606)
Unrealized loss position for more than 12 months, fair value | 84,016 | 237,192
Unrealized loss position for more than 12 months, unrealized loss | $ (213) | $ (2,336)

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