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Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities    
Amortized Cost $ 2,992,763 $ 3,385,441
Gross Unrealized Gains 6,350 6,695
Gross Unrealized Losses (42,337) (56,341)
Fair Value 2,956,776 3,335,795
Schedule of Held-to-maturity Security    
Amortized Cost 0 143,971
Fair Value   144,593
Carrying amount of investment security held-to-maturity transferred to available-for-sale 115,600  
Investment Securities    
Amortized Cost 2,992,763 3,529,412
Gross Unrealized Gains 6,350 7,317
Gross Unrealized Losses (42,337) (56,341)
Fair Value 2,956,776 3,480,388
U.S. Treasury securities    
Schedule of Available-for-sale Securities    
Amortized Cost 533,035 730,287
Gross Unrealized Gains 0 21
Gross Unrealized Losses (6,703) (9,829)
Fair Value 526,332 720,479
U.S. government agency and U.S. government sponsored enterprise debt securities    
Schedule of Available-for-sale Securities    
Amortized Cost 191,727 277,891
Gross Unrealized Gains 81 224
Gross Unrealized Losses (2,623) (3,249)
Fair Value 189,185 274,866
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 321,943 272,672
Gross Unrealized Gains 326 345
Gross Unrealized Losses (7,097) (6,218)
Fair Value 315,172 266,799
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 1,154,026 1,266,372
Gross Unrealized Gains 4,790 3,924
Gross Unrealized Losses (7,882) (11,549)
Fair Value 1,150,934 1,258,747
Municipal securities    
Schedule of Available-for-sale Securities    
Amortized Cost 116,798 148,302
Gross Unrealized Gains 900 1,252
Gross Unrealized Losses (456) (1,900)
Fair Value 117,242 147,654
Non-agency residential mortgage-backed securities | Investment grade    
Schedule of Available-for-sale Securities    
Amortized Cost 9,680 11,592
Gross Unrealized Gains 21 0
Gross Unrealized Losses (7) (115)
Fair Value 9,694 11,477
Corporate debt securities | Investment grade    
Schedule of Available-for-sale Securities    
Amortized Cost 2,464 222,190
Gross Unrealized Gains 0 562
Gross Unrealized Losses (137) (375)
Fair Value 2,327 222,377
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 (576) (1,018)
Fair Value 9,615 9,173
Foreign bonds | Investment grade    
Schedule of Available-for-sale Securities    
Amortized Cost 505,395 405,443
Gross Unrealized Gains 229 30
Gross Unrealized Losses (16,484) (21,579)
Fair Value 489,140 383,894
Foreign bonds | Investment grade | Multilateral development bank    
Schedule of Available-for-sale Securities    
Fair Value 458,900 353,600
Other securities    
Schedule of Available-for-sale Securities    
Amortized Cost 147,504 40,501
Gross Unrealized Gains 3 337
Gross Unrealized Losses (372) (509)
Fair Value 147,135 40,329
Non-agency commercial mortgage-backed security    
Schedule of Held-to-maturity Security    
Amortized Cost 0 143,971
Gross Unrealized Gains 0 622
Gross Unrealized Losses 0 0
Fair Value $ 0 $ 144,593