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Estimated Fair Values of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Assets, carrying amount        
Cash and cash equivalents $ 44,319 $ 55,223 $ 37,846 $ 26,821
Interest-bearing deposits   1,415    
Loans held for sale, carrying amount 4,072 1,441    
Loans, carrying amount 947,375 900,460    
FHLB stock, carrying amount 14,391 14,391    
Interest receivable, carrying amount 3,930 4,248    
Liabilities, carrying amount        
Deposits, carrying amount 1,193,031 1,166,637    
FHLB advances, carrying amount 113,194 101,451    
Other borrowings, carrying amount 11,812 12,410    
Interest payable, carrying amount 447 340    
Advances by borrowers for taxes and insurance, carrying amount 2,675 1,720    
Assets        
Cash and cash equivalents 44,319 55,223    
Interest-bearing deposits   1,415    
Loans held for sale, fair value 4,216 1,459    
Loans, fair value 977,803 921,212    
FHLB stock, fair value 14,391 14,391    
Interest receivable, fair value 3,930 4,248    
Liabilities, fair value        
Deposits, fair value 1,210,969 1,132,031    
FHLB advances, fair value 115,174 103,980    
Other borrowings, fair value 13,006 13,083    
Interest payable, fair value 447 340    
Advances by borrowers for taxes and insurance, fair value 2,675 1,720    
Fair Value, Inputs, Level 1
       
Assets        
Cash and cash equivalents 44,319      
Liabilities, fair value        
Deposits, fair value 596,913      
Fair Value, Inputs, Level 2
       
Assets        
Loans held for sale, fair value 4,216      
FHLB stock, fair value 14,391      
Interest receivable, fair value 3,930      
Liabilities, fair value        
FHLB advances, fair value 115,174      
Other borrowings, fair value 13,006      
Interest payable, fair value 447      
Advances by borrowers for taxes and insurance, fair value 2,675      
Fair Value, Inputs, Level 3
       
Assets        
Loans, fair value 977,803      
Liabilities, fair value        
Deposits, fair value $ 614,056