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Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Held-to-maturity: |  |
Allowance for losses | $ (640) |
Debt Securities |  |
Available-for-sale: |  |
Amount Outstanding | 2,954,990 | $ 2,960,048
Unamortized Premium/(Discount) | 4,704 | 1,382
Amortized Cost | 2,959,694 | 2,961,430
Allowance for losses | (24) |
Unrealized Gains | 15,739 | 3,959
Unrealized Losses | (14,252) | (5,546)
Fair Value | 2,961,157 | 2,959,843
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 4,704 | 1,382
Total investment securities |  |
Amount Outstanding | 3,000,022 | 3,005,080
Unamortized Premium/(Discount) | 4,704 | 1,382
Amortized Cost | 3,004,726 | 3,006,462
Allowance for losses | (24) |
Unrealized Gains | 15,870 | 4,912
Unrealized Losses | (14,252) | (5,546)
Fair Value | 3,006,320 | 3,005,828
Accrued interest excluded | 8,300 |
Available-for-Sale Securities | Debt Securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 4,704 | 1,382
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 4,704 | 1,382
Total investment securities |  |
Unamortized Premium/(Discount) | 4,704 | 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 | 19,700 | 19,700
Allowance for losses | (24) |
Unrealized Gains | 0 | 0
Unrealized Losses | (2,955) | (788)
Fair Value | 16,721 | 18,912
Floating Interest Rate | Floating rate asset-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 10,521 | 11,092
Amortized Cost | 10,521 | 11,092
Allowance for losses | 0 |
Unrealized Gains | 0 | 0
Unrealized Losses | (18) | (7)
Fair Value | 10,503 | 11,085
Floating Interest Rate | Government/GSE Guaranteed Mortgage Backed Securities |  |
Available-for-sale: |  |
Amount Outstanding | 1,783,998 | 1,633,731
Amortized Cost | 1,784,293 | 1,634,905
Allowance for losses | 0 |
Unrealized Gains | 4,985 | 2,414
Unrealized Losses | (11,279) | (4,736)
Fair Value | 1,777,999 | 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) | 295 | 1,174
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 295 | 1,174
Total investment securities |  |
Unamortized Premium/(Discount) | 295 | 1,174
Fixed Interest Rate | Government/GSE Guaranteed Mortgage Backed Securities |  |
Available-for-sale: |  |
Amount Outstanding | 306 | 315
Amortized Cost | 306 | 315
Allowance for losses | 0 |
Unrealized Gains | 29 | 25
Unrealized Losses | 0 | 0
Fair Value | 335 | 340
Held-to-maturity: |  |
Amount Outstanding | 45,032 | 45,032
Amortized Cost | 45,032 | 45,032
Allowance for losses | 0 |
Unrealized Gains | 131 | 953
Unrealized Losses | 0 | 0
Fair Value | $ 45,163 | $ 45,985
Total investment securities |  |
Held-to-maturity investment securities weighted average yield | 3.00% | 3.30%
Fixed Interest Rate | Fixed rate U.S. Treasuries |  |
Available-for-sale: |  |
Amount Outstanding | $ 1,140,465 | $ 1,295,210
Amortized Cost | 1,144,874 | 1,295,418
Allowance for losses | 0 |
Unrealized Gains | 10,725 | 1,520
Unrealized Losses | 0 | (15)
Fair Value | 1,155,599 | 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) | 4,409 | 208
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 4,409 | 208
Total investment securities |  |
Unamortized Premium/(Discount) | 4,409 | 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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