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INVESTMENT SECURITIES - Unrealized Loss Position (Details) $ in Thousands | Mar. 31, 2025 USD ($) security | Dec. 31, 2024 USD ($) security
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, fair value | $ 1,277,370 | $ 1,859,962
Unrealized loss position for less than 12 months, unrealized loss | (9,183) | (22,477)
Unrealized loss position for more than 12 months, fair value | 2,051,437 | 2,049,525
Unrealized loss position for more than 12 months, unrealized loss | $ (113,259) | $ (139,112)
Investment securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, number of securities in loss position | security | 64 | 90
Unrealized loss position for more than 12 months, number of securities in loss position | security | 157 | 155
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 | 19,353 | 19,476
Unrealized loss position for more than 12 months, unrealized loss | (320) | (197)
Floating interest rate | Guaranteed mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, fair value | 480,450 | 269,862
Unrealized loss position for less than 12 months, unrealized loss | (593) | (420)
Unrealized loss position for more than 12 months, fair value | 1,014,378 | 1,025,360
Unrealized loss position for more than 12 months, unrealized loss | (13,295) | (13,530)
Fixed Interest Rate | Guaranteed mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, fair value | 487,530 | 999,793
Unrealized loss position for less than 12 months, unrealized loss | (7,324) | (17,682)
Unrealized loss position for more than 12 months, fair value | 971,658 | 946,166
Unrealized loss position for more than 12 months, unrealized loss | (99,490) | (125,068)
Fixed Interest Rate | US treasuries |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized loss position for less than 12 months, fair value | 309,390 | 590,307
Unrealized loss position for less than 12 months, unrealized loss | (1,266) | (4,375)
Unrealized loss position for more than 12 months, fair value | 46,048 | 58,523
Unrealized loss position for more than 12 months, unrealized loss | $ (154) | $ (317)

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479106/326-30-50-5 + Details
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