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Investment Securities Summary of Amortized Cost and Fair Values of Corporate Debt Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized Cost | $ 2,574,943 |
Estimated Fair Value | 2,547,038 |
Corporate Debt Securities Issued by Financial Institutions [Member] |  |
Amortized Cost | 92,379 | $ 108,014
Estimated Fair Value | 93,335 | 105,407
Single-issuer trust preferred securities |  |
Amortized Cost | 31,335 | 43,746
Estimated Fair Value | 30,703 | 39,829
Subordinated debt |  |
Amortized Cost | 49,013 | 46,231
Estimated Fair Value | 49,533 | 46,723
Senior notes |  |
Amortized Cost | 12,031 | 18,037
Estimated Fair Value | 12,392 | 18,433
Pooled trust preferred securities |  |
Amortized Cost | 0 | 0
Estimated Fair Value | 707 | 422
Other corporate debt securities |  |
Amortized Cost | 3,974 | 4,002
Estimated Fair Value | 3,974 | 4,002
Corporate debt securities |  |
Amortized Cost | 96,353 | 112,016
Estimated Fair Value | $ 97,309 | $ 109,409

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