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Gross Unrealized Losses and Fair Value Aggregated by Investment Category and Length of Time in Continuous Unrealized Loss Position (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]  
Less than 12 months Fair Value $ 2,005
Less than 12 months Unrealized Loss 25
12 months or more Fair Value 467
12 months or more Unrealized Loss 179
Total Fair Value 2,472
Total Unrealized Loss 204
Obligations of U.S. Govt Agencies
  
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]  
Less than 12 months Fair Value 22
Less than 12 months Unrealized Loss 6
Total Fair Value 22
Total Unrealized Loss 6
State and Municipal
  
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]  
12 months or more Fair Value 285
12 months or more Unrealized Loss 15
Total Fair Value 285
Total Unrealized Loss 15
Corporate Trust Preferred
  
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]  
12 months or more Fair Value 182
12 months or more Unrealized Loss 164
Total Fair Value 182
Total Unrealized Loss 164
Mortgage Backed
  
Available for Sale Securities Continuous Unrealized Loss Position [Line Items]  
Less than 12 months Fair Value 1,983
Less than 12 months Unrealized Loss 19
Total Fair Value 1,983
Total Unrealized Loss $ 19