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
Jun. 30, 2016
Dec. 31, 2015
Fair Value    
Less than 12 Months $ 886,516 $ 2,987,605
Over 12 Months 347,364 563,431
Total 1,233,880 3,551,036
Unrealized Losses    
Less than 12 Months (23,415) (34,876)
Over 12 Months (39,838) (48,775)
Total (63,253) (83,651)
Federal agencies: Mortgage-backed securities    
Fair Value    
Less than 12 Months 104,627 1,658,516
Over 12 Months 32,718 84,147
Total 137,345 1,742,663
Unrealized Losses    
Less than 12 Months (263) (11,341)
Over 12 Months (166) (2,367)
Total (429) (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 104,627 1,696,498
Over 12 Months 32,718 84,147
Total 137,345 1,780,645
Unrealized Losses    
Less than 12 Months (263) (11,392)
Over 12 Months (166) (2,367)
Total (429) (13,759)
Municipal securities    
Fair Value    
Less than 12 Months 537,833 570,916
Over 12 Months 187,853 248,204
Total 725,686 819,120
Unrealized Losses    
Less than 12 Months (20,445) (15,992)
Over 12 Months (7,499) (11,113)
Total (27,944) (27,105)
Asset-backed securities    
Fair Value    
Less than 12 Months 244,056 552,275
Over 12 Months 124,200 207,639
Total 368,256 759,914
Unrealized Losses    
Less than 12 Months (2,707) (5,791)
Over 12 Months (32,162) (34,390)
Total (34,869) (40,181)
Corporate debt    
Fair Value    
Less than 12 Months 0 167,144
Over 12 Months 296 21,965
Total 296 189,109
Unrealized Losses    
Less than 12 Months 0 (1,673)
Over 12 Months (8) (881)
Total (8) (2,554)
Other securities    
Fair Value    
Less than 12 Months 772
Over 12 Months 2,297 1,476
Total 2,297 2,248
Unrealized Losses    
Less than 12 Months (28)
Over 12 Months (3) (24)
Total $ (3) $ (52)