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Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investment securities: |  |
Available-for-sale: |  |
Amount Outstanding | $ 3,826,582 | $ 2,960,048
Unamortized Premium/(Discount) | 17,084 | 1,382
Amortized cost of available-for-sale investment securities | 3,843,666 | 2,961,430
Allowance for losses | (36) |
Unrealized Gains | 13,642 | 3,959
Unrealized Losses | (3,580) | (5,546)
Available-for-sale, at fair value | 3,853,692 | 2,959,843
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 17,084 | 1,382
Total investment securities |  |
Amount Outstanding | 3,871,614 | 3,005,080
Unamortized Premium/(Discount) | 17,084 | 1,382
Amortized Cost | 3,888,698 | 3,006,462
Allowance for losses | (36) |
Unrealized Gains | 14,843 | 4,912
Unrealized Losses | (3,580) | (5,546)
Fair Value | 3,899,925 | 3,005,828
Accrued interest excluded | 9,000 |
Available-for-Sale Securities | Investment securities: |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 17,084 | 1,382
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 17,084 | 1,382
Total investment securities |  |
Unamortized Premium/(Discount) | 17,084 | 1,382
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 of available-for-sale investment securities | 19,700 | 19,700
Allowance for losses | (36) |
Unrealized Gains | 0 | 0
Unrealized Losses | (493) | (788)
Available-for-sale, at fair value | 19,171 | 18,912
Floating Interest Rate | Floating rate asset-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 6,232 | 11,092
Amortized cost of available-for-sale investment securities | 6,232 | 11,092
Allowance for losses | 0 |
Unrealized Gains | 0 | 0
Unrealized Losses | (1) | (7)
Available-for-sale, at fair value | 6,231 | 11,085
Floating Interest Rate | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 2,350,963 | 1,633,731
Amortized cost of available-for-sale investment securities | 2,350,919 | 1,634,905
Allowance for losses | 0 |
Unrealized Gains | 12,150 | 2,414
Unrealized Losses | (3,043) | (4,736)
Available-for-sale, at fair value | 2,360,026 | 1,632,583
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
Total investment securities |  |
Unamortized Premium/(Discount) | 0 | 0
Floating Interest Rate | Available-for-Sale Securities | Floating rate asset-backed securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 0 | 0
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 0 | 0
Total investment securities |  |
Unamortized Premium/(Discount) | 0 | 0
Floating Interest Rate | Available-for-Sale Securities | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (44) | 1,174
Held-to-maturity: |  |
Unamortized Premium/(Discount) | (44) | 1,174
Total investment securities |  |
Unamortized Premium/(Discount) | (44) | 1,174
Fixed Interest Rate | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 279 | 315
Amortized cost of available-for-sale investment securities | 279 | 315
Allowance for losses | 0 |
Unrealized Gains | 34 | 25
Unrealized Losses | 0 | 0
Available-for-sale, at fair value | 313 | 340
Held-to-maturity: |  |
Amount Outstanding | 45,032 | 45,032
Amortized Cost | 45,032 | 45,032
Allowance for losses | 0 |
Unrealized Gains | 1,201 | 953
Unrealized Losses | 0 | 0
Fair Value | $ 46,233 | $ 45,985
Total investment securities |  |
Held-to-maturity investment securities weighted average yield | 1.50% | 3.30%
Fixed Interest Rate | Fixed rate U.S. Treasuries |  |
Available-for-sale: |  |
Amount Outstanding | $ 1,449,408 | $ 1,295,210
Amortized cost of available-for-sale investment securities | 1,466,536 | 1,295,418
Allowance for losses | 0 |
Unrealized Gains | 1,458 | 1,520
Unrealized Losses | (43) | (15)
Available-for-sale, at fair value | 1,467,951 | 1,296,923
Fixed Interest Rate | Available-for-Sale Securities | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 0 | 0
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 0 | 0
Total investment securities |  |
Unamortized Premium/(Discount) | 0 | 0
Fixed Interest Rate | Available-for-Sale Securities | Fixed rate U.S. Treasuries |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 17,128 | 208
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 17,128 | 208
Total investment securities |  |
Unamortized Premium/(Discount) | 17,128 | 208
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
Total investment securities |  |
Unamortized Premium/(Discount) | $ 0 | $ 0

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