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INVESTMENT SECURITIES - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Investment securities |  |
Available-for-sale: |  |
Amount Outstanding | $ 6,013,517 | $ 5,120,963
Amortized cost | 5,941,321 | 5,060,135
Allowance for losses | (25) | (27)
Unrealized Gains | 39,660 | 9,844
Unrealized Losses | (103,020) | (151,021)
Fair Value | 5,877,936 | 4,918,931
Held-to-maturity: |  |
Amount Outstanding | 9,270 | 53,756
Amortized cost | 9,270 | 53,756
Allowance for losses | 0 | 0
Unrealized Gains | 273 | 1,745
Unrealized Losses | 0 | 0
Fair Value | 9,543 | 55,501
Available-for-sale, accrued interest excluded | 24,500 | 15,900
Available-for-Sale Securities | Investment securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (72,196) | (60,828)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (72,196) | (60,828)
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 | (25) | (27)
Unrealized Gains | 0 | 0
Unrealized Losses | (197) | (591)
Fair Value | 19,478 | 19,082
Floating interest rate | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 2,450,408 | 2,454,009
Amortized cost | 2,449,883 | 2,452,871
Allowance for losses | 0 | 0
Unrealized Gains | 3,756 | 1,212
Unrealized Losses | (17,204) | (29,649)
Fair Value | 2,436,435 | 2,424,434
Floating interest rate | US Treasuries |  |
Available-for-sale: |  |
Amount Outstanding | 0 | 50,000
Amortized cost | 0 | 49,983
Allowance for losses | 0 | 0
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | (15)
Fair Value | 0 | 49,968
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) | (525) | (1,138)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (525) | (1,138)
Floating interest rate | Available-for-Sale Securities | US Treasuries |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 0 | (17)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 0 | (17)
Fixed Interest Rate | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 2,262,332 | 1,727,669
Amortized cost | 2,203,239 | 1,680,881
Allowance for losses | 0 | 0
Unrealized Gains | 25,573 | 6,558
Unrealized Losses | (85,054) | (117,824)
Fair Value | 2,143,758 | 1,569,615
Held-to-maturity: |  |
Amount Outstanding | 9,270 | 53,756
Amortized cost | 9,270 | 53,756
Allowance for losses | 0 | 0
Unrealized Gains | 273 | 1,745
Unrealized Losses | 0 | 0
Fair Value | $ 9,543 | $ 55,501
Held-to-maturity investment securities weighted average yield | 6.40% | 6.70%
Fixed Interest Rate | US Treasuries |  |
Available-for-sale: |  |
Amount Outstanding | $ 1,281,077 | $ 869,585
Amortized cost | 1,268,499 | 856,700
Allowance for losses | 0 | 0
Unrealized Gains | 10,331 | 2,074
Unrealized Losses | (565) | (2,942)
Fair Value | 1,278,265 | 855,832
Fixed Interest Rate | Available-for-Sale Securities | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (59,093) | (46,788)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (59,093) | (46,788)
Fixed Interest Rate | Available-for-Sale Securities | US Treasuries |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (12,578) | (12,885)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (12,578) | (12,885)
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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