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Investment Securities Summary of Amortized Cost and Fair Values of Corporate Debt Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 2,655,314 |
Corporate debt securities | 2,592,823 |
Corporate Debt Securities Issued by Financial Institutions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 97,392 | $ 92,379
Corporate debt securities | 97,980 | 93,335
Single-issuer Trust Preferred Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 31,352 | 31,335
Corporate debt securities | 30,513 | 30,703
Subordinated Debt |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 54,011 | 49,013
Corporate debt securities | 54,357 | 49,533
Senior Debt Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 12,029 | 12,031
Corporate debt securities | 12,245 | 12,392
Pooled Trust Preferred Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 0 | 0
Corporate debt securities | 865 | 707
Other Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 3,975 | 3,974
Corporate debt securities | 3,975 | 3,974
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 101,367 | 96,353
Corporate debt securities | $ 101,955 | $ 97,309

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