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Information Pertaining to Investment Securities Aggregated by Investment Category and Length of Time (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses $ (897) $ (1,458)
Fair Value 110,570 146,688
Gross Unrealized Losses (40) (147)
Fair Value 1,060 2,927
US Government agencies
   
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses (6)  
Fair Value 1,288  
Obligations of states and political subdivisions
   
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses (107) (26)
Fair Value 9,085 1,735
Gross Unrealized Losses (40) (119)
Fair Value 1,060 1,978
U.S. Government agencies collateralized by mortgage obligations
   
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Losses (784) (1,432)
Fair Value 100,197 144,953
Gross Unrealized Losses   (28)
Fair Value   $ 949