Quarterly report pursuant to Section 13 or 15(d)

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

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AVAILABLE-FOR-SALE AND OTHER SECURITIES AVAILABLE-FOR-SALE AND OTHER SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Fair Value    
Less than 12 Months $ 9,773,917 $ 10,687,088
Over 12 Months 459,490 494,614
Total 10,233,407 11,181,702
Unrealized Losses    
Less than 12 Months (161,205) (221,568)
Over 12 Months (27,715) (40,076)
Total (188,920) (261,644)
Federal agencies: Mortgage-backed securities    
Fair Value    
Less than 12 Months 8,879,526 8,908,470
Over 12 Months 42,504 41,706
Total 8,922,030 8,950,176
Unrealized Losses    
Less than 12 Months (147,900) (189,318)
Over 12 Months (1,202) (1,349)
Total (149,102) (190,667)
Federal agencies, Other agencies    
Fair Value    
Less than 12 Months 12,793 924
Over 12 Months 0 0
Total 12,793 924
Unrealized Losses    
Less than 12 Months (48) (6)
Over 12 Months 0 0
Total (48) (6)
Total U.S. Treasury, Federal agency securities    
Fair Value    
Less than 12 Months 8,892,319 8,909,394
Over 12 Months 42,504 41,706
Total 8,934,823 8,951,100
Unrealized Losses    
Less than 12 Months (147,948) (189,324)
Over 12 Months (1,202) (1,349)
Total (149,150) (190,673)
Municipal securities    
Fair Value    
Less than 12 Months 702,379 1,412,152
Over 12 Months 241,487 272,292
Total 943,866 1,684,444
Unrealized Losses    
Less than 12 Months (11,895) (29,175)
Over 12 Months (6,254) (9,627)
Total (18,149) (38,802)
Asset-backed securities    
Fair Value    
Less than 12 Months 177,834 361,185
Over 12 Months 173,808 178,924
Total 351,642 540,109
Unrealized Losses    
Less than 12 Months (1,348) (3,043)
Over 12 Months (20,250) (29,092)
Total (21,598) (32,135)
Corporate debt    
Fair Value    
Less than 12 Months 595 3,567
Over 12 Months 200 200
Total 795 3,767
Unrealized Losses    
Less than 12 Months (4) (15)
Over 12 Months 0 0
Total (4) (15)
Other securities    
Fair Value    
Less than 12 Months 790 790
Over 12 Months 1,491 1,492
Total 2,281 2,282
Unrealized Losses    
Less than 12 Months (10) (11)
Over 12 Months (9) (8)
Total $ (19) $ (19)