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Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities |  |
Available-for-sale: |  |
Amount Outstanding | $ 2,960,048 | $ 2,226,409
Unamortized Premium/(Discount) | 1,382 | (3,489)
Amortized Cost | 2,961,430 | 2,222,920
Unrealized Gains | 3,959 | 860
Unrealized Losses | (5,546) | (5,928)
Fair Value | 2,959,843 | 2,217,852
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 1,382 | (3,489)
Total investment securities |  |
Amount Outstanding | 3,005,080 | 2,271,441
Unamortized Premium/(Discount) | 1,382 | (3,489)
Amortized Cost | 3,006,462 | 2,267,952
Unrealized Gains | 4,912 | 1,422
Unrealized Losses | (5,546) | (5,928)
Fair Value | 3,005,828 | 2,263,446
Available-for-Sale Securities | Debt Securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 1,382 | (3,489)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 1,382 | (3,489)
Total investment securities |  |
Unamortized Premium/(Discount) | 1,382 | (3,489)
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
Unrealized Gains | 0 | 0
Unrealized Losses | (788) | (985)
Fair Value | 18,912 | 18,715
Floating Interest Rate | Floating rate asset-backed securities |  |
Available-for-sale: |  |
Amount Outstanding | 11,092 | 28,940
Amortized Cost | 11,092 | 28,804
Unrealized Gains | 0 | 2
Unrealized Losses | (7) | (128)
Fair Value | 11,085 | 28,678
Floating Interest Rate | Government/GSE Guaranteed Mortgage Backed Securities |  |
Available-for-sale: |  |
Amount Outstanding | 1,633,731 | 1,379,472
Amortized Cost | 1,634,905 | 1,381,000
Unrealized Gains | 2,414 | 721
Unrealized Losses | (4,736) | (4,267)
Fair Value | 1,632,583 | 1,377,454
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 | (136)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 0 | (136)
Total investment securities |  |
Unamortized Premium/(Discount) | 0 | (136)
Floating Interest Rate | Available-for-Sale Securities | Government/GSE Guaranteed Mortgage Backed Securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 1,174 | 1,528
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 1,174 | 1,528
Total investment securities |  |
Unamortized Premium/(Discount) | 1,174 | 1,528
Fixed Interest Rate | Government/GSE Guaranteed Mortgage Backed Securities |  |
Available-for-sale: |  |
Amount Outstanding | 315 | 384
Amortized Cost | 315 | 385
Unrealized Gains | 25 | 18
Unrealized Losses | 0 | 0
Fair Value | 340 | 403
Held-to-maturity: |  |
Amount Outstanding | 45,032 | 45,032
Amortized Cost | 45,032 | 45,032
Unrealized Gains | 953 | 562
Unrealized Losses | 0 | 0
Fair Value | $ 45,985 | $ 45,594
Total investment securities |  |
Held-to-maturity investment securities weighted average yield | 3.30% | 3.50%
Fixed Interest Rate | Fixed rate U.S. Treasuries |  |
Available-for-sale: |  |
Amount Outstanding | $ 1,295,210 | $ 797,913
Amortized Cost | 1,295,418 | 793,031
Unrealized Gains | 1,520 | 119
Unrealized Losses | (15) | (548)
Fair Value | 1,296,923 | 792,602
Fixed Interest Rate | Available-for-Sale Securities | Government/GSE Guaranteed Mortgage Backed Securities |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 0 | 1
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 0 | 1
Total investment securities |  |
Unamortized Premium/(Discount) | 0 | 1
Fixed Interest Rate | Available-for-Sale Securities | Fixed rate U.S. Treasuries |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 208 | (4,882)
Held-to-maturity: |  |
Unamortized Premium/(Discount) | 208 | (4,882)
Total investment securities |  |
Unamortized Premium/(Discount) | 208 | (4,882)
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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