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
Sep. 30, 2016
Dec. 31, 2015
Fair Value    
Less than 12 Months $ 3,717,144 $ 2,987,605
Over 12 Months 336,382 563,431
Total 4,053,526 3,551,036
Unrealized Losses    
Less than 12 Months (40,594) (34,876)
Over 12 Months (36,602) (48,775)
Total (77,196) (83,651)
Federal agencies: Mortgage-backed securities    
Fair Value    
Less than 12 Months 2,583,032 1,658,516
Over 12 Months 30,742 84,147
Total 2,613,774 1,742,663
Unrealized Losses    
Less than 12 Months (7,836) (11,341)
Over 12 Months (256) (2,367)
Total (8,092) (13,708)
Federal agencies, Other agencies    
Fair Value    
Less than 12 Months 0 37,982
Over 12 Months 0 0
Total 0 37,982
Unrealized Losses    
Less than 12 Months 0 (51)
Over 12 Months 0 0
Total 0 (51)
Total U.S. Treasury, Federal agency securities    
Fair Value    
Less than 12 Months 2,583,032 1,696,498
Over 12 Months 30,742 84,147
Total 2,613,774 1,780,645
Unrealized Losses    
Less than 12 Months (7,836) (11,392)
Over 12 Months (256) (2,367)
Total (8,092) (13,759)
Municipal securities    
Fair Value    
Less than 12 Months 911,170 570,916
Over 12 Months 178,540 248,204
Total 1,089,710 819,120
Unrealized Losses    
Less than 12 Months (30,367) (15,992)
Over 12 Months (7,097) (11,113)
Total (37,464) (27,105)
Asset-backed securities    
Fair Value    
Less than 12 Months 199,279 552,275
Over 12 Months 125,304 207,639
Total 324,583 759,914
Unrealized Losses    
Less than 12 Months (2,085) (5,791)
Over 12 Months (29,241) (34,390)
Total (31,326) (40,181)
Corporate debt    
Fair Value    
Less than 12 Months 23,663 167,144
Over 12 Months 299 21,965
Total 23,962 189,109
Unrealized Losses    
Less than 12 Months (306) (1,673)
Over 12 Months (5) (881)
Total (311) (2,554)
Other securities    
Fair Value    
Less than 12 Months 0 772
Over 12 Months 1,497 1,476
Total 1,497 2,248
Unrealized Losses    
Less than 12 Months 0 (28)
Over 12 Months (3) (24)
Total $ (3) $ (52)