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INVESTMENT SECURITIES - Unrealized Loss Position (Details) $ in Thousands | Mar. 31, 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 | $ 1,429,751 | $ 1,143,468
Unrealized loss position for less than 12 months, Unrealized Loss | (12,342) | (9,278)
Unrealized loss position for more than 12 months, Fair Value | 2,405,544 | 2,611,155
Unrealized loss position for more than 12 months, Unrealized Loss | $ (150,849) | $ (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 | 107 | 91
Unrealized loss position for more than 12 months, Number of securities in loss position | security | 158 | 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 | 19,281 | 19,082
Unrealized loss position for more than 12 months, Unrealized Loss | (394) | (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 | 414,299 | 568,759
Unrealized loss position for less than 12 months, Unrealized Loss | (2,066) | (4,395)
Unrealized loss position for more than 12 months, Fair Value | 1,293,103 | 1,449,122
Unrealized loss position for more than 12 months, Unrealized Loss | (22,020) | (25,254)
Floating interest rate | US Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, Fair Value |  | 49,969
Unrealized loss position for less than 12 months, Unrealized Loss |  | (15)
Unrealized loss position for more than 12 months, Fair Value |  | 0
Unrealized loss position for more than 12 months, Unrealized Loss |  | 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 | 458,047 | 384,305
Unrealized loss position for less than 12 months, Unrealized Loss | (7,183) | (4,262)
Unrealized loss position for more than 12 months, Fair Value | 991,514 | 905,759
Unrealized loss position for more than 12 months, Unrealized Loss | (127,368) | (113,562)
Fixed Interest Rate | US Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, Fair Value | 557,405 | 140,435
Unrealized loss position for less than 12 months, Unrealized Loss | (3,093) | (606)
Unrealized loss position for more than 12 months, Fair Value | 101,646 | 237,192
Unrealized loss position for more than 12 months, Unrealized Loss | $ (1,067) | $ (2,336)

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