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Fair Values and Related Carrying Amounts of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Financial Assets, Carrying Amount        
Cash and cash equivalents $ 61,776 $ 96,467 $ 77,094 $ 32,678
Interest-bearing deposits with financial institutions 1,553 1,423    
Federal Reserve Bank and Federal Home Loan Bank stock 10,729 11,154    
Securities available for sale 99,111 147,909    
Mortgage loans held for sale 143,588 66,230    
Loans, net 693,115 641,962    
Financial Liabilities, Carrying Amount        
Noninterest bearing deposits 170,011 164,382    
Interest-bearing deposits 686,995 697,665    
Borrowings 69,000 49,000    
Junior Subordinated Debentures 17,527 17,527    
Financial Assets, Estimated Fair Value        
Cash and cash equivalents 61,776 96,467    
Interest-bearing deposits with financial institutions 1,553 1,423    
Federal Reserve Bank and Federal Home Loan Bank stock 10,729 11,154    
Securities available for sale 99,111 147,909    
Mortgage loans held for sale 143,588 66,230    
Loans, net 683,497 626,227    
Financial Liabilities, Estimated Fair Value        
Noninterest bearing deposits 170,011 164,382    
Interest-bearing deposits 687,530 698,797    
Borrowings 69,272 58,409    
Junior subordinated debentures $ 17,527 $ 17,527