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Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Held-to-maturity: |  |
Allowance for losses | $ (546) |
Debt Securities |  |
Available-for-sale: |  |
Amount Outstanding | 3,453,165 | $ 2,960,048
Unamortized Premium/(Discount) | 5,792 | 1,382
Amortized cost of available-for-sale investment securities | 3,458,957 | 2,961,430
Allowance for losses | (38) |
Unrealized Gains | 13,482 | 3,959
Unrealized Losses | (5,023) | (5,546)
Fair Value | 3,467,378 | 2,959,843
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 5,792 | 1,382
Total investment securities |  |
Amount Outstanding | 3,498,197 | 3,005,080
Unamortized Premium/(Discount) | 5,792 | 1,382
Amortized Cost | 3,503,989 | 3,006,462
Allowance for losses | (38) |
Unrealized Gains | 14,132 | 4,912
Unrealized Losses | (5,023) | (5,546)
Fair Value | 3,513,060 | 3,005,828
Accrued interest excluded | 6,600 |
Available-for-Sale Securities | Debt Securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 5,792 | 1,382
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 5,792 | 1,382
Total investment securities |  |
Unamortized Premium/(Discount) | 5,792 | 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 | (38) |
Unrealized Gains | 0 | 0
Unrealized Losses | (1,379) | (788)
Fair Value | 18,283 | 18,912
Floating Interest Rate | Floating rate asset-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 9,818 | 11,092
Amortized cost of available-for-sale investment securities | 9,818 | 11,092
Allowance for losses | 0 |
Unrealized Gains | 0 | 0
Unrealized Losses | (11) | (7)
Fair Value | 9,807 | 11,085
Floating Interest Rate | Government/GSE Guaranteed Mortgage Backed Securities |  |
Available-for-sale: |  |
Amount Outstanding | 2,108,505 | 1,633,731
Amortized cost of available-for-sale investment securities | 2,108,534 | 1,634,905
Allowance for losses | 0 |
Unrealized Gains | 7,409 | 2,414
Unrealized Losses | (3,566) | (4,736)
Fair Value | 2,112,377 | 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 | Government/GSE Guaranteed Mortgage Backed Securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 29 | 1,174
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 29 | 1,174
Total investment securities |  |
Unamortized Premium/(Discount) | 29 | 1,174
Fixed Interest Rate | Government/GSE Guaranteed Mortgage Backed Securities |  |
Available-for-sale: |  |
Amount Outstanding | 292 | 315
Amortized cost of available-for-sale investment securities | 292 | 315
Allowance for losses | 0 |
Unrealized Gains | 30 | 25
Unrealized Losses | 0 | 0
Fair Value | 322 | 340
Held-to-maturity: |  |
Amount Outstanding | 45,032 | 45,032
Amortized Cost | 45,032 | 45,032
Allowance for losses | 0 |
Unrealized Gains | 650 | 953
Unrealized Losses | 0 | 0
Fair Value | $ 45,682 | $ 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 | $ 1,314,850 | $ 1,295,210
Amortized cost of available-for-sale investment securities | 1,320,613 | 1,295,418
Allowance for losses | 0 |
Unrealized Gains | 6,043 | 1,520
Unrealized Losses | (67) | (15)
Fair Value | 1,326,589 | 1,296,923
Fixed Interest Rate | Available-for-Sale Securities | Government/GSE 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) | 5,763 | 208
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 5,763 | 208
Total investment securities |  |
Unamortized Premium/(Discount) | 5,763 | 208
Fixed Interest Rate | Held-to-Maturity Securities | Government/GSE 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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