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Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities |  |
Amortized Cost | $ 2,855,424 | $ 3,385,441
Gross Unrealized Gains | 8,731 | 6,695
Gross Unrealized Losses | (41,430) | (56,341)
Fair Value | 2,822,725 | 3,335,795
Schedule of Held-to-maturity Security |  |
Amortized Cost | 121,131 | 143,971
Fair Value | 121,803 | 144,593
Investment Securities |  |
Amortized Cost | 2,976,555 | 3,529,412
Gross Unrealized Gains | 9,403 | 7,317
Gross Unrealized Losses | (41,430) | (56,341)
Fair Value | 2,944,528 | 3,480,388
U.S. Treasury securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 553,795 | 730,287
Gross Unrealized Gains | 0 | 21
Gross Unrealized Losses | (6,938) | (9,829)
Fair Value | 546,857 | 720,479
U.S. government agency and U.S. government sponsored enterprise debt securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 176,037 | 277,891
Gross Unrealized Gains | 203 | 224
Gross Unrealized Losses | (2,655) | (3,249)
Fair Value | 173,585 | 274,866
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 331,288 | 272,672
Gross Unrealized Gains | 592 | 345
Gross Unrealized Losses | (6,736) | (6,218)
Fair Value | 325,144 | 266,799
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 1,130,303 | 1,266,372
Gross Unrealized Gains | 5,685 | 3,924
Gross Unrealized Losses | (7,457) | (11,549)
Fair Value | 1,128,531 | 1,258,747
Municipal securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 104,991 | 148,302
Gross Unrealized Gains | 915 | 1,252
Gross Unrealized Losses | (404) | (1,900)
Fair Value | 105,502 | 147,654
Non-agency residential mortgage-backed securities | Investment grade |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 10,262 | 11,592
Gross Unrealized Gains | 14 | 0
Gross Unrealized Losses | (66) | (115)
Fair Value | 10,210 | 11,477
Corporate debt securities | Investment grade |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 2,472 | 222,190
Gross Unrealized Gains | 0 | 562
Gross Unrealized Losses | (176) | (375)
Fair Value | 2,296 | 222,377
Corporate debt securities | Non-investment grade |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 10,191 | 10,191
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (699) | (1,018)
Fair Value | 9,492 | 9,173
Foreign bonds | Investment grade |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 495,397 | 405,443
Gross Unrealized Gains | 252 | 30
Gross Unrealized Losses | (15,962) | (21,579)
Fair Value | 479,687 | 383,894
Foreign bonds | Investment grade | Multilateral development bank |  |
Schedule of Available-for-sale Securities |  |
Fair Value | 449,400 | 353,600
Other securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 40,688 | 40,501
Gross Unrealized Gains | 1,070 | 337
Gross Unrealized Losses | (337) | (509)
Fair Value | 41,421 | 40,329
Non-agency commercial mortgage-backed security |  |
Schedule of Held-to-maturity Security |  |
Amortized Cost | 121,131 | 143,971
Gross Unrealized Gains | 672 | 622
Gross Unrealized Losses | 0 | 0
Fair Value | $ 121,803 | $ 144,593

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