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Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities    
Amortized Cost $ 3,005,433 $ 3,385,441
Gross Unrealized Gains 7,147 6,695
Gross Unrealized Losses (50,546) (56,341)
Fair Value 2,962,034 3,335,795
Schedule of Held-to-maturity Security    
Amortized Cost 132,497 143,971
Fair Value 133,656 144,593
Investment Securities    
Amortized Cost 3,137,930 3,529,412
Gross Unrealized Gains 8,306 7,317
Gross Unrealized Losses (50,546) (56,341)
Fair Value 3,095,690 3,480,388
U.S. Treasury securities    
Schedule of Available-for-sale Securities    
Amortized Cost 709,332 730,287
Gross Unrealized Gains 10 21
Gross Unrealized Losses (8,482) (9,829)
Fair Value 700,860 720,479
U.S. government agency and U.S. government sponsored enterprise debt securities    
Schedule of Available-for-sale Securities    
Amortized Cost 183,605 277,891
Gross Unrealized Gains 134 224
Gross Unrealized Losses (2,876) (3,249)
Fair Value 180,863 274,866
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 271,025 272,672
Gross Unrealized Gains 337 345
Gross Unrealized Losses (6,840) (6,218)
Fair Value 264,522 266,799
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 1,185,382 1,266,372
Gross Unrealized Gains 3,855 3,924
Gross Unrealized Losses (9,482) (11,549)
Fair Value 1,179,755 1,258,747
Municipal securities    
Schedule of Available-for-sale Securities    
Amortized Cost 146,559 148,302
Gross Unrealized Gains 1,909 1,252
Gross Unrealized Losses (1,399) (1,900)
Fair Value 147,069 147,654
Non-agency residential mortgage-backed securities | Investment grade    
Schedule of Available-for-sale Securities    
Amortized Cost 10,837 11,592
Gross Unrealized Gains 0 0
Gross Unrealized Losses (107) (115)
Fair Value 10,730 11,477
Corporate debt securities | Investment grade    
Schedule of Available-for-sale Securities    
Amortized Cost 2,476 222,190
Gross Unrealized Gains 0 562
Gross Unrealized Losses (222) (375)
Fair Value 2,254 222,377
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 (1,007) (1,018)
Fair Value 9,184 9,173
Foreign bonds | Investment grade    
Schedule of Available-for-sale Securities    
Amortized Cost 445,433 405,443
Gross Unrealized Gains 49 30
Gross Unrealized Losses (19,614) (21,579)
Fair Value 425,868 383,894
Foreign bonds | Investment grade | Multilateral development bank    
Schedule of Available-for-sale Securities    
Fair Value 395,500 353,600
Other securities    
Schedule of Available-for-sale Securities    
Amortized Cost 40,593 40,501
Gross Unrealized Gains 853 337
Gross Unrealized Losses (517) (509)
Fair Value 40,929 40,329
Non-agency commercial mortgage-backed security    
Schedule of Held-to-maturity Security    
Amortized Cost 132,497 143,971
Gross Unrealized Gains 1,159 622
Gross Unrealized Losses 0 0
Fair Value $ 133,656 $ 144,593