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INVESTMENT SECURITIES - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Investment Securities |  |
Available-for-sale: |  |
Amount Outstanding | $ 5,483,836 | $ 5,120,963
Amortized cost | 5,410,032 | 5,060,135
Allowance for losses | (25) | (27)
Unrealized Gains | 5,788 | 9,844
Unrealized Losses | (167,080) | (151,021)
Fair Value | 5,248,715 | 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 | 226 | 1,745
Unrealized Losses | 0 | 0
Fair Value | 9,496 | 55,501
Available-for-sale, accrued interest excluded | 19,400 | 15,900
Available-for-Sale Securities | Investment Securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (73,804) | (60,828)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (73,804) | (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 | 2,262,092 | 2,454,009
Amortized cost | 2,262,121 | 2,452,871
Allowance for losses | 0 | 0
Unrealized Gains | 3,037 | 1,212
Unrealized Losses | (20,258) | (29,649)
Fair Value | 2,244,900 | 2,424,434
Floating interest rate | US Treasuries |  |
Available-for-sale: |  |
Amount Outstanding | 50,000 | 50,000
Amortized cost | 49,996 | 49,983
Allowance for losses | 0 | 0
Unrealized Gains | 0 | 0
Unrealized Losses | (6) | (15)
Fair Value | 49,990 | 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) | 29 | (1,138)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 29 | (1,138)
Floating interest rate | Available-for-Sale Securities | US Treasuries |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (4) | (17)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (4) | (17)
Fixed Interest Rate | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 2,111,417 | 1,727,669
Amortized cost | 2,052,743 | 1,680,881
Allowance for losses | 0 | 0
Unrealized Gains | 2,584 | 6,558
Unrealized Losses | (141,565) | (117,824)
Fair Value | 1,913,762 | 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 | 226 | 1,745
Unrealized Losses | 0 | 0
Fair Value | $ 9,496 | $ 55,501
Held-to-maturity investment securities weighted average yield | 6.40% | 6.70%
Fixed Interest Rate | US Treasuries |  |
Available-for-sale: |  |
Amount Outstanding | $ 1,040,627 | $ 869,585
Amortized cost | 1,025,472 | 856,700
Allowance for losses | 0 | 0
Unrealized Gains | 167 | 2,074
Unrealized Losses | (5,054) | (2,942)
Fair Value | 1,020,585 | 855,832
Fixed Interest Rate | Available-for-Sale Securities | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (58,674) | (46,788)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (58,674) | (46,788)
Fixed Interest Rate | Available-for-Sale Securities | US Treasuries |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (15,155) | (12,885)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (15,155) | (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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