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Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Investment Securities [Member] |  |
Available-for-sale: |  |
Amount Outstanding | $ 2,467,255 | $ 2,226,409
Unamortized Premium/(Discount) | (4,280) | (3,489)
Amortized Cost | 2,462,975 | 2,222,920
Unrealized Gains | 1,354 | 860
Unrealized Losses | (6,351) | (5,928)
Fair Value | 2,457,978 | 2,217,852
Total investment securities |  |
Amount Outstanding | 2,512,287 | 2,271,441
Amortized Cost | 2,508,007 | 2,267,952
Unrealized Gains | 2,280 | 1,422
Unrealized Losses | (6,351) | (5,928)
Fair Value | 2,503,936 | 2,263,446
Available-for-sale Securities [Member] | Investment Securities [Member] |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | (4,280) | (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 | (788) | (985)
Fair Value | 18,912 | 18,715
Floating Interest Rate [Member] | Asset-backed Securities [Member] |  |
Available-for-sale: |  |
Amount Outstanding | 27,726 | 28,940
Amortized Cost | 27,596 | 28,804
Unrealized Gains | 0 | 2
Unrealized Losses | (145) | (128)
Fair Value | 27,451 | 28,678
Floating Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member] |  |
Available-for-sale: |  |
Amount Outstanding | 1,379,534 | 1,379,472
Amortized Cost | 1,380,927 | 1,381,000
Unrealized Gains | 626 | 721
Unrealized Losses | (5,316) | (4,267)
Fair Value | 1,376,237 | 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) | (130) | (136)
Floating Interest Rate [Member] | Available-for-sale Securities [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member] |  |
Available-for-sale: |  |
Unamortized Premium/(Discount) | 1,393 | 1,528
Fixed Interest Rate [Member] | Government/GSE Guaranteed Mortgage Backed Securities [Member] |  |
Available-for-sale: |  |
Amount Outstanding | 370 | 384
Amortized Cost | 370 | 385
Unrealized Gains | 23 | 18
Unrealized Losses | 0 | 0
Fair Value | 393 | 403
Held-to-maturity: |  |
Amount Outstanding | 45,032 | 45,032
Amortized Cost | 45,032 | 45,032
Unrealized Gains | 926 | 562
Unrealized Losses | 0 | 0
Fair Value | $ 45,958 | $ 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 | $ 1,039,925 | $ 797,913
Amortized Cost | 1,034,382 | 793,031
Unrealized Gains | 705 | 119
Unrealized Losses | (102) | (548)
Fair Value | 1,034,985 | 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) | (5,543) | (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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