Quarterly report pursuant to Section 13 or 15(d)

HELD-TO-MATURITY SECURITIES - Continuous Unrealized Loss Position (Details)

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HELD-TO-MATURITY SECURITIES - Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Fair Value    
Less than 12 Months $ 279,965 $ 4,118,300
Over 12 Months 150,218 533,432
Total 430,183 4,651,732
Unrealized Losses    
Less than 12 Months (1,863) (28,107)
Over 12 Months (1,476) (12,307)
Total (3,339) (40,414)
Federal agencies: Mortgage-backed securities    
Fair Value    
Less than 12 Months 273,593 3,692,890
Over 12 Months 150,218 519,872
Total 423,811 4,212,762
Unrealized Losses    
Less than 12 Months (1,862) (25,418)
Over 12 Months (1,476) (12,086)
Total (3,338) (37,504)
Federal agencies, Other agencies    
Fair Value    
Less than 12 Months 0 425,410
Over 12 Months 0 6,647
Total 0 432,057
Unrealized Losses    
Less than 12 Months 0 (2,689)
Over 12 Months 0 (97)
Total 0 (2,786)
Total U.S. Treasury, Federal agency securities    
Fair Value    
Less than 12 Months 273,593 4,118,300
Over 12 Months 150,218 526,519
Total 423,811 4,644,819
Unrealized Losses    
Less than 12 Months (1,862) (28,107)
Over 12 Months (1,476) (12,183)
Total (3,338) (40,290)
Municipal securities    
Fair Value    
Less than 12 Months 6,372 0
Over 12 Months 0 6,913
Total 6,372 6,913
Unrealized Losses    
Less than 12 Months (1) 0
Over 12 Months 0 (124)
Total $ (1) $ (124)