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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ (313) $ (4,611)
Fair Value, Less Than Twelve Months 19,216 164,278
Gross Unrealized Losses, Twelve Months and Over (2,805) (403)
Fair Value, Twelve Months and Over 137,282 4,598
U.S. Treasury [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months   (795)
Fair Value, Less Than Twelve Months   25,272
Gross Unrealized Losses, Twelve Months and Over (619)  
Fair Value, Twelve Months and Over 25,331  
U.S. Government agency [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (3) (2,783)
Fair Value, Less Than Twelve Months 5,529 96,241
Gross Unrealized Losses, Twelve Months and Over (1,858) (403)
Fair Value, Twelve Months and Over 92,529 4,598
Mortgage-backed securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (1) (574)
Fair Value, Less Than Twelve Months 4,788 23,171
Gross Unrealized Losses, Twelve Months and Over (145)  
Fair Value, Twelve Months and Over 8,744  
State and local governments [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (309) (459)
Fair Value, Less Than Twelve Months 8,899 19,594
Gross Unrealized Losses, Twelve Months and Over (183)  
Fair Value, Twelve Months and Over $ 10,678