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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ (4,611) $ (227)
Fair Value, Less Than Twelve Months 164,278 46,505
Gross Unrealized Losses, Twelve Months and Over (403)   
Fair Value, Twelve Months and Over 4,598   
U.S. Treasury [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (795) (36)
Fair Value, Less Than Twelve Months 25,272 10,568
Gross Unrealized Losses, Twelve Months and Over      
Fair Value, Twelve Months and Over      
U.S. Government agency [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (2,783) (171)
Fair Value, Less Than Twelve Months 96,241 33,034
Gross Unrealized Losses, Twelve Months and Over (403)   
Fair Value, Twelve Months and Over 4,598   
Mortgage-backed securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (574)  
Fair Value, Less Than Twelve Months 23,171  
Gross Unrealized Losses, Twelve Months and Over      
Fair Value, Twelve Months and Over      
State and local governments [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (459) (20)
Fair Value, Less Than Twelve Months 19,594 2,903
Gross Unrealized Losses, Twelve Months and Over      
Fair Value, Twelve Months and Over