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
Jun. 30, 2017
Dec. 31, 2016
Fair Value    
Less than 12 Months $ 4,986,941 $ 3,274,469
Over 12 Months 160,437 186,226
Total 5,147,378 3,460,695
Unrealized Losses    
Less than 12 Months (34,463) (35,221)
Over 12 Months (5,036) (7,023)
Total (39,499) (42,244)
Federal agencies: Mortgage-backed securities    
Fair Value    
Less than 12 Months 4,606,283 2,855,360
Over 12 Months 160,437 186,226
Total 4,766,720 3,041,586
Unrealized Losses    
Less than 12 Months (31,348) (31,470)
Over 12 Months (5,036) (7,023)
Total (36,384) (38,493)
Federal agencies, Other agencies    
Fair Value    
Less than 12 Months 375,023 413,207
Over 12 Months 0 0
Total 375,023 413,207
Unrealized Losses    
Less than 12 Months (2,904) (3,482)
Over 12 Months 0 0
Total (2,904) (3,482)
Total U.S. Treasury, Federal agency securities    
Fair Value    
Less than 12 Months 4,981,306 3,268,567
Over 12 Months 160,437 186,226
Total 5,141,743 3,454,793
Unrealized Losses    
Less than 12 Months (34,252) (34,952)
Over 12 Months (5,036) (7,023)
Total (39,288) (41,975)
Municipal securities    
Fair Value    
Less than 12 Months 5,635 5,902
Over 12 Months 0 0
Total 5,635 5,902
Unrealized Losses    
Less than 12 Months (211) (269)
Over 12 Months 0 0
Total $ (211) $ (269)