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INVESTMENT SECURITIES - Unrealized Loss Position (Details) $ in Thousands | Jun. 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 | $ 1,463,271 | $ 1,143,468
Unrealized loss position for less than 12 months, Unrealized Loss | (6,920) | (9,278)
Unrealized loss position for more than 12 months, Fair Value | 2,580,473 | 2,611,155
Unrealized loss position for more than 12 months, Unrealized Loss | $ (160,160) | $ (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 | 97 | 91
Unrealized loss position for more than 12 months, number of securities in loss position | security | 167 | 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 | 334,002 | 568,759
Unrealized loss position for less than 12 months, Unrealized Loss | (856) | (4,395)
Unrealized loss position for more than 12 months, Fair Value | 1,205,757 | 1,449,122
Unrealized loss position for more than 12 months, Unrealized Loss | (19,402) | (25,254)
Floating interest rate | US Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, Fair Value | 49,990 | 49,969
Unrealized loss position for less than 12 months, Unrealized Loss | (6) | (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 | 379,695 | 384,305
Unrealized loss position for less than 12 months, Unrealized Loss | (2,425) | (4,262)
Unrealized loss position for more than 12 months, Fair Value | 1,251,770 | 905,759
Unrealized loss position for more than 12 months, Unrealized Loss | (139,140) | (113,562)
Fixed Interest Rate | US Treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, Fair Value | 699,584 | 140,435
Unrealized loss position for less than 12 months, Unrealized Loss | (3,633) | (606)
Unrealized loss position for more than 12 months, Fair Value | 103,468 | 237,192
Unrealized loss position for more than 12 months, Unrealized Loss | $ (1,421) | $ (2,336)

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