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INVESTMENT SECURITIES - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Investment Securities |  |
Available-for-sale: |  |
Amount Outstanding | $ 5,229,446 | $ 5,120,963
Amortized cost | 5,165,562 | 5,060,135
Allowance for losses | (25) | (27)
Unrealized Gains | 5,441 | 9,844
Unrealized Losses | (163,191) | (151,021)
Fair Value | 5,007,787 | 4,918,931
Held-to-maturity: |  |
Amount Outstanding | 53,756 | 53,756
Amortized Cost | 53,756 | 53,756
Allowance for losses | 0 | 0
Unrealized Gains | 1,104 | 1,745
Unrealized Losses | 0 | 0
Fair Value | 54,860 | 55,501
Available-for-sale, accrued interest excluded | 22,200 | 15,900
Available-for-Sale Securities | Investment Securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (63,884) | (60,828)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (63,884) | (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 | (394) | (591)
Fair Value | 19,281 | 19,082
Floating interest rate | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 2,402,850 | 2,454,009
Amortized cost | 2,401,544 | 2,452,871
Allowance for losses | 0 | 0
Unrealized Gains | 2,608 | 1,212
Unrealized Losses | (24,086) | (29,649)
Fair Value | 2,380,066 | 2,424,434
Floating interest rate | US Treasuries |  |
Available-for-sale: |  |
Amount Outstanding | 50,000 | 50,000
Amortized cost | 49,990 | 49,983
Allowance for losses | 0 | 0
Unrealized Gains | 6 | 0
Unrealized Losses | 0 | (15)
Fair Value | 49,996 | 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) | (1,306) | (1,138)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (1,306) | (1,138)
Floating interest rate | Available-for-Sale Securities | US Treasuries |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (10) | (17)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (10) | (17)
Fixed Interest Rate | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 1,851,641 | 1,727,669
Amortized cost | 1,804,193 | 1,680,881
Allowance for losses | 0 | 0
Unrealized Gains | 2,746 | 6,558
Unrealized Losses | (134,551) | (117,824)
Fair Value | 1,672,388 | 1,569,615
Held-to-maturity: |  |
Amount Outstanding | 53,756 | 53,756
Amortized Cost | 53,756 | 53,756
Allowance for losses | 0 | 0
Unrealized Gains | 1,104 | 1,745
Unrealized Losses | 0 | 0
Fair Value | $ 54,860 | $ 55,501
Held-to-maturity investment securities weighted average yield | 6.70% | 6.70%
Fixed Interest Rate | US Treasuries |  |
Available-for-sale: |  |
Amount Outstanding | $ 905,255 | $ 869,585
Amortized cost | 890,135 | 856,700
Allowance for losses | 0 | 0
Unrealized Gains | 81 | 2,074
Unrealized Losses | (4,160) | (2,942)
Fair Value | 886,056 | 855,832
Fixed Interest Rate | Available-for-Sale Securities | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (47,448) | (46,788)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (47,448) | (46,788)
Fixed Interest Rate | Available-for-Sale Securities | US Treasuries |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (15,120) | (12,885)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (15,120) | (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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