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
Mar. 31, 2017
Dec. 31, 2016
Fair Value    
Less than 12 Months $ 10,993,676 $ 10,687,088
Over 12 Months 501,386 494,614
Total 11,495,062 11,181,702
Unrealized Losses    
Less than 12 Months (224,766) (221,568)
Over 12 Months (35,135) (40,076)
Total (259,901) (261,644)
Federal agencies: Mortgage-backed securities    
Fair Value    
Less than 12 Months 9,846,004 8,908,470
Over 12 Months 40,432 41,706
Total 9,886,436 8,950,176
Unrealized Losses    
Less than 12 Months (202,610) (189,318)
Over 12 Months (1,418) (1,349)
Total (204,028) (190,667)
Federal agencies, Other agencies    
Fair Value    
Less than 12 Months 25,475 924
Over 12 Months 0 0
Total 25,475 924
Unrealized Losses    
Less than 12 Months (43) (6)
Over 12 Months 0 0
Total (43) (6)
Total U.S. Treasury, Federal agency securities    
Fair Value    
Less than 12 Months 9,871,479 8,909,394
Over 12 Months 40,432 41,706
Total 9,911,911 8,951,100
Unrealized Losses    
Less than 12 Months (202,653) (189,324)
Over 12 Months (1,418) (1,349)
Total (204,071) (190,673)
Municipal securities    
Fair Value    
Less than 12 Months 859,848 1,412,152
Over 12 Months 257,829 272,292
Total 1,117,677 1,684,444
Unrealized Losses    
Less than 12 Months (19,825) (29,175)
Over 12 Months (6,302) (9,627)
Total (26,127) (38,802)
Asset-backed securities    
Fair Value    
Less than 12 Months 260,870 361,185
Over 12 Months 201,436 178,924
Total 462,306 540,109
Unrealized Losses    
Less than 12 Months (2,268) (3,043)
Over 12 Months (27,404) (29,092)
Total (29,672) (32,135)
Corporate debt    
Fair Value    
Less than 12 Months 694 3,567
Over 12 Months 200 200
Total 894 3,767
Unrealized Losses    
Less than 12 Months (5) (15)
Over 12 Months 0 0
Total (5) (15)
Other securities    
Fair Value    
Less than 12 Months 785 790
Over 12 Months 1,489 1,492
Total 2,274 2,282
Unrealized Losses    
Less than 12 Months (15) (11)
Over 12 Months (11) (8)
Total $ (26) $ (19)