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Investment Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Available for sale:    
Fair value, less than 12 months $ 743,609 $ 13,016
Unrealized losses, less than 12 months (5,590) (331)
Fair value, 12 months or more 43,353 43,045
Unrealized losses, 12 months or more (12,254) (11,609)
Fair value, total 786,962 56,061
Unrealized losses, total (17,844) (11,940)
Residential mortgage-backed securities
    
Available for sale:    
Fair value, less than 12 months 738,492  
Unrealized losses, less than 12 months (5,476)  
Fair value, 12 months or more 32,860 39,605
Unrealized losses, 12 months or more (10,557) (10,680)
Fair value, total 771,352 39,605
Unrealized losses, total (16,033) (10,680)
Obligations of states and political subdivisions
    
Available for sale:    
Fair value, less than 12 months 5,117 9,531
Unrealized losses, less than 12 months (114) (315)
Fair value, 12 months or more 10,437 3,398
Unrealized losses, 12 months or more (1,677) (896)
Fair value, total 15,554 12,929
Unrealized losses, total (1,791) (1,211)
Equity Securities
    
Available for sale:    
Fair value, less than 12 months   3,485
Unrealized losses, less than 12 months   (16)
Fair value, 12 months or more 56 42
Unrealized losses, 12 months or more (20) (33)
Fair value, total 56 3,527
Unrealized losses, total $ (20) $ (49)