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Condensed Balance Sheets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Assets:      
Other assets $ 1,733 $ 2,139  
Total Assets 459,132 438,886  
Liabilities and Equity:      
Stockholders' equity 52,824 50,942  
Total Liabilities and Equity 459,132 438,886  
Parent Company
      
Assets:      
Cash and cash equivalents 236 278 369
Other assets 120 139  
Investment in subsidiaries 52,473 50,525  
Total Assets 52,829 50,942  
Liabilities and Equity:      
Accrued expenses 5 0  
Stockholders' equity 52,824 50,942  
Total Liabilities and Equity $ 52,829 $ 50,942