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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
Mar. 31, 2013
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]  
Less than 12 months Fair Value $ 25,870
Less than 12 months Unrealized Loss 256
12 months or more Fair Value 501
12 months or more Unrealized Loss 149
Total Fair Value 26,371
Total Unrealized Loss 405
Obligations of U.S. Govt Agencies
  
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]  
Less than 12 months Fair Value 0
Less than 12 months Unrealized Loss 0
12 months or more Fair Value 0
12 months or more Unrealized Loss 0
Total Fair Value 0
Total Unrealized Loss 0
State and Municipal
  
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]  
Less than 12 months Fair Value 6,752
Less than 12 months Unrealized Loss 139
12 months or more Fair Value 284
12 months or more Unrealized Loss 17
Total Fair Value 7,036
Total Unrealized Loss 156
Corporate Trust Preferred
  
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]  
Less than 12 months Fair Value 0
Less than 12 months Unrealized Loss 0
12 months or more Fair Value 217
12 months or more Unrealized Loss 132
Total Fair Value 217
Total Unrealized Loss 132
Mortgage Backed
  
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]  
Less than 12 months Fair Value 19,118
Less than 12 months Unrealized Loss 117
12 months or more Fair Value 0
12 months or more Unrealized Loss 0
Total Fair Value 19,118
Total Unrealized Loss $ 117