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Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Investment Securities [Member] |  |
Available-for-sale: |  |
Amount Outstanding | $ 2,924,407 | $ 2,226,409
Unamortized Premium/(Discount) | (4,248) | (3,489)
Amortized Cost | 2,920,159 | 2,222,920
Unrealized Gains | 6,258 | 860
Unrealized Losses | (3,913) | (5,928)
Fair Value | 2,922,504 | 2,217,852
Total investment securities |  |
Amount Outstanding | 2,969,439 | 2,271,441
Amortized Cost | 2,965,191 | 2,267,952
Unrealized Gains | 6,987 | 1,422
Unrealized Losses | (3,913) | (5,928)
Fair Value | 2,968,265 | 2,263,446
Available-for-sale Securities [Member] | Investment Securities [Member] |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (4,248) | (3,489)
Floating Interest Rate [Member] | 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 | (492) | (985)
Fair Value | 19,208 | 18,715
Floating Interest Rate [Member] | Asset-backed Securities [Member] |  |
Available-for-sale: |  |
Amount Outstanding | 26,118 | 28,940
Amortized Cost | 25,995 | 28,804
Unrealized Gains | 0 | 2
Unrealized Losses | (193) | (128)
Fair Value | 25,802 | 28,678
Floating Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member] |  |
Available-for-sale: |  |
Amount Outstanding | 1,601,067 | 1,379,472
Amortized Cost | 1,602,421 | 1,381,000
Unrealized Gains | 4,168 | 721
Unrealized Losses | (3,219) | (4,267)
Fair Value | 1,603,370 | 1,377,454
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Floating rate auction-rate certificates backed by Government guaranteed student loans |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 0 | 0
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Asset-backed Securities [Member] |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (123) | (136)
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member] |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 1,354 | 1,528
Fixed Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member] |  |
Available-for-sale: |  |
Amount Outstanding | 335 | 384
Amortized Cost | 335 | 385
Unrealized Gains | 23 | 18
Unrealized Losses | 0 | 0
Fair Value | 358 | 403
Held-to-maturity: |  |
Amount Outstanding | 45,032 | 45,032
Amortized Cost | 45,032 | 45,032
Unrealized Gains | 729 | 562
Unrealized Losses | 0 | 0
Fair Value | $ 45,761 | $ 45,594
Total investment securities |  |
Held-to-maturity investment securities weighted average yield | 3.80% | 3.50%
Fixed Interest Rate [Member] | US Treasury Securities [Member] |  |
Available-for-sale: |  |
Amount Outstanding | $ 1,277,187 | $ 797,913
Amortized Cost | 1,271,708 | 793,031
Unrealized Gains | 2,067 | 119
Unrealized Losses | (9) | (548)
Fair Value | 1,273,766 | 792,602
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member] |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 0 | 1
Fixed Interest Rate [Member] | Available-for-sale Securities [Member] | US Treasury Securities [Member] |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (5,479) | (4,882)
Fixed Interest Rate [Member] | Held-to-maturity Securities [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member] |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | $ 0 | $ 0

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