Annual report pursuant to Section 13 and 15(d)

AVAILABLE-FOR-SALE AND OTHER SECURITIES - Continuous Unrealized Loss Position (Details)

v3.6.0.2
AVAILABLE-FOR-SALE AND OTHER SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 10,687,088 $ 2,987,605
Over 12 Months, Fair Value 494,614 563,431
Total, Fair Value 11,181,702 3,551,036
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (221,568) (34,876)
Over 12 Months, Unrealized Losses (40,076) (48,775)
Total, Unrealized Losses (261,644) (83,651)
Federal agencies: Mortgage-backed    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 8,908,470 1,658,516
Over 12 Months, Fair Value 41,706 84,147
Total, Fair Value 8,950,176 1,742,663
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (189,318) (11,341)
Over 12 Months, Unrealized Losses (1,349) (2,367)
Total, Unrealized Losses (190,667) (13,708)
Federal agencies: Other agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 924 37,982
Over 12 Months, Fair Value 0 0
Total, Fair Value 924 37,982
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (6) (51)
Over 12 Months, Unrealized Losses 0 0
Total, Unrealized Losses (6) (51)
Total U.S. Government backed agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 8,909,394 1,696,498
Over 12 Months, Fair Value 41,706 84,147
Total, Fair Value 8,951,100 1,780,645
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (189,324) (11,392)
Over 12 Months, Unrealized Losses (1,349) (2,367)
Total, Unrealized Losses (190,673) (13,759)
Municipal securities    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 1,412,152 570,916
Over 12 Months, Fair Value 272,292 248,204
Total, Fair Value 1,684,444 819,120
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (29,175) (15,992)
Over 12 Months, Unrealized Losses (9,627) (11,113)
Total, Unrealized Losses (38,802) (27,105)
Asset-backed securities    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 361,185 552,275
Over 12 Months, Fair Value 178,924 207,639
Total, Fair Value 540,109 759,914
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (3,043) (5,791)
Over 12 Months, Unrealized Losses (29,092) (34,390)
Total, Unrealized Losses (32,135) (40,181)
Corporate debt    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 3,567 167,144
Over 12 Months, Fair Value 200 21,965
Total, Fair Value 3,767 189,109
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (15) (1,673)
Over 12 Months, Unrealized Losses 0 (881)
Total, Unrealized Losses (15) (2,554)
Other securities    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 790 772
Over 12 Months, Fair Value 1,492 1,476
Total, Fair Value 2,282 2,248
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (11) (28)
Over 12 Months, Unrealized Losses (8) (24)
Total, Unrealized Losses $ (19) $ (52)