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INVESTMENT SECURITIES - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Investment securities |  |
Available-for-sale: |  |
Amount Outstanding | $ 6,405,423 | $ 6,183,545
Amortized cost | 6,329,188 | 6,105,116
Allowance for losses | (27) | (27)
Unrealized Gains | 23,361 | 9,514
Unrealized Losses | (122,442) | (161,589)
Fair Value | 6,230,080 | 5,953,014
Held-to-maturity: |  |
Amount Outstanding | 9,125 | 9,270
Amortized cost | 9,125 | 9,270
Allowance for losses | 0 | 0
Unrealized Gains | 309 | 270
Unrealized Losses | 0 | 0
Fair Value | 9,434 | 9,540
Available-for-sale, accrued interest excluded | 27,100 | 22,300
Available-for-Sale Securities | Investment securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (76,235) | (78,429)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (76,235) | (78,429)
Held-to-Maturity Securities | Investment securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 0 | 0
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 0 | 0
Floating interest rate | Floating rate auction-rate certificates backed by Government guaranteed student loans |  |
Available-for-sale: |  |
Amount Outstanding | 19,700 | 19,700
Amortized cost | 19,700 | 19,700
Allowance for losses | (27) | (27)
Unrealized Gains | 0 | 0
Unrealized Losses | (320) | (197)
Fair Value | 19,353 | 19,476
Floating interest rate | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 2,404,113 | 2,317,032
Amortized cost | 2,402,939 | 2,316,191
Allowance for losses | 0 | 0
Unrealized Gains | 3,046 | 3,484
Unrealized Losses | (13,888) | (13,950)
Fair Value | 2,392,097 | 2,305,725
Floating interest rate | Available-for-Sale Securities | Floating rate auction-rate certificates backed by Government guaranteed student loans |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 0 | 0
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 0 | 0
Floating interest rate | Available-for-Sale Securities | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (1,174) | (841)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (1,174) | (841)
Fixed Interest Rate | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 2,661,093 | 2,544,136
Amortized cost | 2,595,137 | 2,477,291
Allowance for losses | 0 | 0
Unrealized Gains | 15,589 | 3,426
Unrealized Losses | (106,814) | (142,750)
Fair Value | 2,503,912 | 2,337,967
Held-to-maturity: |  |
Amount Outstanding | 9,125 | 9,270
Amortized cost | 9,125 | 9,270
Allowance for losses | 0 | 0
Unrealized Gains | 309 | 270
Unrealized Losses | 0 | 0
Fair Value | $ 9,434 | $ 9,540
Held-to-maturity investment securities weighted average yield | 6.40% | 6.40%
Fixed Interest Rate | US treasuries |  |
Available-for-sale: |  |
Amount Outstanding | $ 1,320,517 | $ 1,302,677
Amortized cost | 1,311,412 | 1,291,934
Allowance for losses | 0 | 0
Unrealized Gains | 4,726 | 2,604
Unrealized Losses | (1,420) | (4,692)
Fair Value | 1,314,718 | 1,289,846
Fixed Interest Rate | Available-for-Sale Securities | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (65,956) | (66,845)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (65,956) | (66,845)
Fixed Interest Rate | Available-for-Sale Securities | US treasuries |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (9,105) | (10,743)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (9,105) | (10,743)
Fixed Interest Rate | Held-to-Maturity Securities | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 0 | 0
Held-to-maturity: |  |
Unamortized Premium/(Discount) | $ 0 | $ 0

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