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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ (4,142) $ (4,611)
Fair Value, Less Than Twelve Months 160,645 164,278
Gross Unrealized Losses, Twelve Months and Over (376) (403)
Fair Value, Twelve Months and Over 5,035 4,598
U.S. Treasury [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (780) (795)
Fair Value, Less Than Twelve Months 25,229 25,272
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 (2,412) (2,783)
Fair Value, Less Than Twelve Months 92,561 96,241
Gross Unrealized Losses, Twelve Months and Over (355) (403)
Fair Value, Twelve Months and Over 4,646 4,598
Mortgage-backed securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (324) (574)
Fair Value, Less Than Twelve Months 20,008 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 (626) (459)
Fair Value, Less Than Twelve Months 22,847 19,594
Gross Unrealized Losses, Twelve Months and Over (21)   
Fair Value, Twelve Months and Over $ 389