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Investment Securities (Details 3) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Available for sale:    
Fair value, less than 12 months $ 236,066 $ 13,016
Unrealized losses, less than 12 months (1,763) (331)
Fair value, 12 months or more 42,728 43,045
Unrealized losses, 12 months or more (12,360) (11,609)
Fair value, total 278,794 56,061
Unrealized losses, total (14,123) (11,940)
Residential mortgage-backed securities
    
Available for sale:    
Fair value, less than 12 months 231,625  
Unrealized losses, less than 12 months (1,672)  
Fair value, 12 months or more 34,288 39,605
Unrealized losses, 12 months or more (10,980) (10,680)
Fair value, total 265,913 39,605
Unrealized losses, total (12,652) (10,680)
Obligations of states and political subdivisions
    
Available for sale:    
Fair value, less than 12 months 4,441 9,531
Unrealized losses, less than 12 months (91) (315)
Fair value, 12 months or more 8,386 3,398
Unrealized losses, 12 months or more (1,358) (896)
Fair value, total 12,827 12,929
Unrealized losses, total (1,449) (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 54  
Unrealized losses, 12 months or more (22)  
Fair value, total 54  
Unrealized losses, total $ (22)