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Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Held-to-maturity: |  |
Allowance for losses | $ (216) |
Investment securities |  |
Available-for-sale: |  |
Amount Outstanding | 3,513,235 | $ 2,960,048
Unamortized Premium/(Discount) | 9,439 | 1,382
Amortized cost of available-for-sale investment securities | 3,522,674 | 2,961,430
Allowance for losses | (37) |
Unrealized Gains | 13,309 | 3,959
Unrealized Losses | (3,756) | (5,546)
Available-for-sale, at fair value | 3,532,190 | 2,959,843
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 9,439 | 1,382
Total investment securities |  |
Amount Outstanding | 3,558,267 | 3,005,080
Unamortized Premium/(Discount) | 9,439 | 1,382
Amortized Cost | 3,567,706 | 3,006,462
Allowance for losses | (37) |
Unrealized Gains | 14,462 | 4,912
Unrealized Losses | (3,756) | (5,546)
Fair Value | 3,578,375 | 3,005,828
Accrued interest excluded | 5,700 |
Available-for-Sale Securities | Investment securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 9,439 | 1,382
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 9,439 | 1,382
Total investment securities |  |
Unamortized Premium/(Discount) | 9,439 | 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 | (37) |
Unrealized Gains | 0 | 0
Unrealized Losses | (591) | (788)
Available-for-sale, at fair value | 19,072 | 18,912
Floating Interest Rate | Floating rate asset-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 9,205 | 11,092
Amortized cost of available-for-sale investment securities | 9,205 | 11,092
Allowance for losses | 0 |
Unrealized Gains | 0 | 0
Unrealized Losses | (4) | (7)
Available-for-sale, at fair value | 9,201 | 11,085
Floating Interest Rate | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 2,279,737 | 1,633,731
Amortized cost of available-for-sale investment securities | 2,279,770 | 1,634,905
Allowance for losses | 0 |
Unrealized Gains | 9,415 | 2,414
Unrealized Losses | (3,152) | (4,736)
Available-for-sale, at fair value | 2,286,033 | 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) | 33 | 1,174
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 33 | 1,174
Total investment securities |  |
Unamortized Premium/(Discount) | 33 | 1,174
Fixed Interest Rate | Guaranteed mortgage-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 285 | 315
Amortized cost of available-for-sale investment securities | 285 | 315
Allowance for losses | 0 |
Unrealized Gains | 33 | 25
Unrealized Losses | 0 | 0
Available-for-sale, at fair value | 318 | 340
Held-to-maturity: |  |
Amount Outstanding | 45,032 | 45,032
Amortized Cost | 45,032 | 45,032
Allowance for losses | 0 |
Unrealized Gains | 1,153 | 953
Unrealized Losses | 0 | 0
Fair Value | $ 46,185 | $ 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 | $ 1,204,308 | $ 1,295,210
Amortized cost of available-for-sale investment securities | 1,213,714 | 1,295,418
Allowance for losses | 0 |
Unrealized Gains | 3,861 | 1,520
Unrealized Losses | (9) | (15)
Available-for-sale, at fair value | 1,217,566 | 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) | 9,406 | 208
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 9,406 | 208
Total investment securities |  |
Unamortized Premium/(Discount) | 9,406 | 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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