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Investment Securities (Details 3) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Available for sale:    
Fair value, less than 12 months $ 730,912 $ 816,979
Unrealized losses, less than 12 Months (5,409) (5,008)
Fair value, 12 months or more 1,587,053 1,872,077
Unrealized losses, 12 Months or More (42,095) (45,973)
Fair value, total 2,317,965 2,689,056
Unrealized losses, total (47,504) (50,981)
Residential mortgage-backed securities    
Available for sale:    
Fair value, less than 12 months 705,681 808,072
Unrealized losses, less than 12 Months (5,033) (4,910)
Fair value, 12 months or more 1,556,390 1,836,218
Unrealized losses, 12 Months or More (35,769) (40,268)
Fair value, total 2,262,071 2,644,290
Unrealized losses, total (40,802) (45,178)
States and political subdivisions    
Available for sale:    
Fair value, less than 12 months 20,252 8,833
Unrealized losses, less than 12 Months (355) (97)
Fair value, 12 months or more 25,113 27,793
Unrealized losses, 12 Months or More (6,126) (5,521)
Fair value, total 45,365 36,626
Unrealized losses, total (6,481) (5,618)
Other    
Available for sale:    
Fair value, less than 12 months 4,979 74
Unrealized losses, less than 12 Months (21) (1)
Fair value, 12 months or more 5,550 8,066
Unrealized losses, 12 Months or More (200) (184)
Fair value, total 10,529 8,140
Unrealized losses, total $ (221) $ (185)