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, 2016
Dec. 31, 2015
Fair Value    
Less than 12 Months $ 1,112,204 $ 2,987,605
Over 12 Months 455,579 563,431
Total 1,567,783 3,551,036
Unrealized Losses    
Less than 12 Months (25,990) (34,876)
Over 12 Months (53,839) (48,775)
Total (79,829) (83,651)
Federal agencies: Mortgage-backed securities    
Fair Value    
Less than 12 Months 266,950 1,658,516
Over 12 Months 61,611 84,147
Total 328,561 1,742,663
Unrealized Losses    
Less than 12 Months (709) (11,341)
Over 12 Months (354) (2,367)
Total (1,063) (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 266,950 1,696,498
Over 12 Months 61,611 84,147
Total 328,561 1,780,645
Unrealized Losses    
Less than 12 Months (709) (11,392)
Over 12 Months (354) (2,367)
Total (1,063) (13,759)
Municipal securities    
Fair Value    
Less than 12 Months 521,994 570,916
Over 12 Months 208,458 248,204
Total 730,452 819,120
Unrealized Losses    
Less than 12 Months (19,927) (15,992)
Over 12 Months (14,739) (11,113)
Total (34,666) (27,105)
Asset-backed securities    
Fair Value    
Less than 12 Months 305,927 552,275
Over 12 Months 173,013 207,639
Total 478,940 759,914
Unrealized Losses    
Less than 12 Months (5,319) (5,791)
Over 12 Months (38,647) (34,390)
Total (43,966) (40,181)
Corporate debt    
Fair Value    
Less than 12 Months 17,333 167,144
Over 12 Months 10,217 21,965
Total 27,550 189,109
Unrealized Losses    
Less than 12 Months (35) (1,673)
Over 12 Months (79) (881)
Total $ (114) (2,554)
Other securities    
Fair Value    
Less than 12 Months 772
Over 12 Months $ 2,280 1,476
Total $ 2,280 2,248
Unrealized Losses    
Less than 12 Months (28)
Over 12 Months $ (20) (24)
Total $ (20) $ (52)