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Investment Securities (Details 4) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Securities Available for Sale, Gross Unrealized Losses      
Less Than Twelve Months $ 11,864 $ 183 $ 173
Twelve Months or More 27    
Securities Available for Sale, Fair Value      
Less Than Twelve Months 286,837 28,283 28,913
Twelve Months or More 2,225    
State and municipal obligations
     
Securities Held to Maturity, Gross Unrealized Losses      
Less Than Twelve Months 13    
Securities Held to Maturity, Fair Value      
Less Than Twelve Months 488    
Securities Available for Sale, Gross Unrealized Losses      
Less Than Twelve Months 3,942 49 44
Securities Available for Sale, Fair Value      
Less Than Twelve Months 88,497 9,602 5,983
Government-sponsored entities debt
     
Securities Available for Sale, Gross Unrealized Losses      
Less Than Twelve Months 5,515 31 1
Securities Available for Sale, Fair Value      
Less Than Twelve Months 85,500 4,963 3,979
Mortgage-backed securities
     
Securities Available for Sale, Gross Unrealized Losses      
Less Than Twelve Months 2,404 102 82
Twelve Months or More 27    
Securities Available for Sale, Fair Value      
Less Than Twelve Months 112,833 13,709 18,849
Twelve Months or More 2,225    
Corporate stocks
     
Securities Available for Sale, Gross Unrealized Losses      
Less Than Twelve Months 3 1  
Securities Available for Sale, Fair Value      
Less Than Twelve Months 7 9  
FHLMC preferred stock
     
Securities Available for Sale, Gross Unrealized Losses      
Less Than Twelve Months     46
Securities Available for Sale, Fair Value      
Less Than Twelve Months     $ 102