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Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Investment Securities [Member] |  |
Available-for-sale: |  |
Amount Outstanding | $ 3,113,742 | $ 2,226,409
Unamortized Premium/(Discount) | (2,396) | (3,489)
Amortized Cost | 3,111,346 | 2,222,920
Unrealized Gains | 4,535 | 860
Unrealized Losses | (4,249) | (5,928)
Fair Value | 3,111,632 | 2,217,852
Total investment securities |  |
Amount Outstanding | 3,158,774 | 2,271,441
Amortized Cost | 3,156,378 | 2,267,952
Unrealized Gains | 5,034 | 1,422
Unrealized Losses | (4,249) | (5,928)
Fair Value | 3,157,163 | 2,263,446
Available-for-sale Securities [Member] | Investment Securities [Member] |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (2,396) | (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 | 24,860 | 28,940
Amortized Cost | 24,744 | 28,804
Unrealized Gains | 0 | 2
Unrealized Losses | (175) | (128)
Fair Value | 24,569 | 28,678
Floating Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member] |  |
Available-for-sale: |  |
Amount Outstanding | 1,621,660 | 1,379,472
Amortized Cost | 1,622,931 | 1,381,000
Unrealized Gains | 2,807 | 721
Unrealized Losses | (3,500) | (4,267)
Fair Value | 1,622,238 | 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) | (116) | (136)
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member] |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 1,271 | 1,528
Fixed Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member] |  |
Available-for-sale: |  |
Amount Outstanding | 325 | 384
Amortized Cost | 325 | 385
Unrealized Gains | 27 | 18
Unrealized Losses | 0 | 0
Fair Value | 352 | 403
Held-to-maturity: |  |
Amount Outstanding | 45,032 | 45,032
Amortized Cost | 45,032 | 45,032
Unrealized Gains | 499 | 562
Unrealized Losses | 0 | 0
Fair Value | $ 45,531 | $ 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 | $ 1,447,197 | $ 797,913
Amortized Cost | 1,443,646 | 793,031
Unrealized Gains | 1,701 | 119
Unrealized Losses | (82) | (548)
Fair Value | 1,445,265 | 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) | (3,551) | (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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