Annual report pursuant to Section 13 and 15(d)

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

v3.3.1.900
AVAILABLE-FOR-SALE AND OTHER SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value $ 2,987,605 $ 1,437,360
Over 12 Months, Fair Value 563,431 1,063,142
Total, Fair Value 3,551,036 2,500,502
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (34,876) (12,949)
Over 12 Months, Unrealized Losses (48,775) (79,821)
Total, Unrealized Losses (83,651) (92,770)
Federal agencies: Mortgage-backed    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 1,658,516 501,858
Over 12 Months, Fair Value 84,147 527,280
Total, Fair Value 1,742,663 1,029,138
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (11,341) (1,909)
Over 12 Months, Unrealized Losses (2,367) (13,195)
Total, Unrealized Losses (13,708) (15,104)
Federal agencies: Other agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 37,982 159,708
Over 12 Months, Fair Value 0 1,281
Total, Fair Value 37,982 160,989
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (51) (1,020)
Over 12 Months, Unrealized Losses 0 (23)
Total, Unrealized Losses (51) (1,043)
Total U.S. Government backed agencies    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 1,696,498 661,566
Over 12 Months, Fair Value 84,147 528,561
Total, Fair Value 1,780,645 1,190,127
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (11,392) (2,929)
Over 12 Months, Unrealized Losses (2,367) (13,218)
Total, Unrealized Losses (13,759) (16,147)
Municipal securities    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 570,916 568,619
Over 12 Months, Fair Value 248,204 96,426
Total, Fair Value 819,120 665,045
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (15,992) (9,127)
Over 12 Months, Unrealized Losses (11,113) (1,013)
Total, Unrealized Losses (27,105) (10,140)
Private-label CMO    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value   0
Over 12 Months, Fair Value   22,650
Total, Fair Value   22,650
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses   0
Over 12 Months, Unrealized Losses   (2,920)
Total, Unrealized Losses   (2,920)
Asset-backed securities    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 552,275 157,613
Over 12 Months, Fair Value 207,639 325,691
Total, Fair Value 759,914 483,304
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (5,791) (641)
Over 12 Months, Unrealized Losses (34,390) (60,421)
Total, Unrealized Losses (40,181) (61,062)
Corporate debt    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 167,144 49,562
Over 12 Months, Fair Value 21,965 88,398
Total, Fair Value 189,109 137,960
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (1,673) (252)
Over 12 Months, Unrealized Losses (881) (2,165)
Total, Unrealized Losses (2,554) (2,417)
Other securities    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]    
Less than 12 months, Fair Value 772 0
Over 12 Months, Fair Value 1,476 1,416
Total, Fair Value 2,248 1,416
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]    
Less than 12 Months, Unrealized Losses (28) 0
Over 12 Months, Unrealized Losses (24) (84)
Total, Unrealized Losses $ (52) $ (84)