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Investment Securities with Unrealized Gross Losses (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months $ (4,808) $ (1,104)
Fair Value, Less Than Twelve Months 218,024 118,361
Gross Unrealized Losses, Over Twelve Months (253) (61)
Fair Value, Over Twelve Months 13,147 6,965
U.S. Government agencies
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (74) (17)
Fair Value, Less Than Twelve Months 2,615 1,996
Gross Unrealized Losses, Over Twelve Months 0 0
Fair Value, Over Twelve Months 0 0
Obligations of State and Political Subdivisions
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (1,948) (180)
Fair Value, Less Than Twelve Months 36,167 9,324
Gross Unrealized Losses, Over Twelve Months (22) 0
Fair Value, Over Twelve Months 309 0
U.S. Government agencies collateralized by mortgage obligations
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months (2,786) (903)
Fair Value, Less Than Twelve Months 179,242 106,799
Gross Unrealized Losses, Over Twelve Months (231) (61)
Fair Value, Over Twelve Months 12,838 6,965
Other Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses, Less Than Twelve Months 0 (4)
Fair Value, Less Than Twelve Months 0 242
Gross Unrealized Losses, Over Twelve Months 0 0
Fair Value, Over Twelve Months $ 0 $ 0