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Investment Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Available for sale:    
Fair value, less than 12 months $ 576,430 $ 13,016
Unrealized losses, less than 12 months (2,933) (331)
Fair value, 12 months or more 41,511 43,045
Unrealized losses, 12 months or more (12,721) (11,609)
Fair value, total 617,941 56,061
Unrealized losses, total (15,654) (11,940)
Residential mortgage-backed securities
    
Available for sale:    
Fair value, less than 12 months 555,546  
Unrealized losses, less than 12 months (2,644)  
Fair value, 12 months or more 35,877 39,605
Unrealized losses, 12 months or more (11,621) (10,680)
Fair value, total 591,423 39,605
Unrealized losses, total (14,265) (10,680)
Obligations of states and political subdivisions
    
Available for sale:    
Fair value, less than 12 months 20,884 9,531
Unrealized losses, less than 12 months (289) (315)
Fair value, 12 months or more 5,584 3,398
Unrealized losses, 12 months or more (1,075) (896)
Fair value, total 26,468 12,929
Unrealized losses, total (1,364) (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   42
Unrealized losses, 12 months or more   (33)
Fair value, total   3,527
Unrealized losses, total   (49)
Other equity securities
    
Available for sale:    
Fair value, 12 months or more 50  
Unrealized losses, 12 months or more (25)  
Fair value, total 50  
Unrealized losses, total $ (25)