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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