Quarterly report pursuant to Section 13 or 15(d)

Investment Securities Continuous Unrealized Loss Position (Detail)

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Investment Securities Continuous Unrealized Loss Position (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Gain (Loss) on Investments [Line Items]    
Less Than Twelve Months Gross Unrealized Losses $ (67) $ (94)
Less Than Twelve Months Fair Value 13,402 19,633
Twelve Months or More Gross Unrealized Losses      
Twelve Months or More Fair Value      
Total Gross Unrealized Losses (67) (94)
Total Fair Value 13,402 19,633
U.S. Treasury and government sponsored agencies
    
Gain (Loss) on Investments [Line Items]    
Less Than Twelve Months Gross Unrealized Losses   (59)
Less Than Twelve Months Fair Value   15,074
Twelve Months or More Gross Unrealized Losses      
Twelve Months or More Fair Value      
Total Gross Unrealized Losses   (59)
Total Fair Value   15,074
Mortgage-backed securities
    
Gain (Loss) on Investments [Line Items]    
Less Than Twelve Months Gross Unrealized Losses (31)  
Less Than Twelve Months Fair Value 5,902  
Twelve Months or More Gross Unrealized Losses     
Twelve Months or More Fair Value     
Total Gross Unrealized Losses (31)  
Total Fair Value 5,902  
State and municipal securities
    
Gain (Loss) on Investments [Line Items]    
Less Than Twelve Months Gross Unrealized Losses (36) (35)
Less Than Twelve Months Fair Value 7,500 4,559
Twelve Months or More Gross Unrealized Losses      
Twelve Months or More Fair Value      
Total Gross Unrealized Losses (36) (35)
Total Fair Value 7,500 4,559
Corporate debt
    
Gain (Loss) on Investments [Line Items]    
Twelve Months or More Gross Unrealized Losses      
Twelve Months or More Fair Value