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Condensed Parent Company Only Financial Statements - Condensed Balance Sheets (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Assets        
Cash in bank $ 32,638,900 $ 39,539,366 $ 31,769,438 $ 36,970,638
Investment securities 149,632,153 157,255,828    
Total Assets 984,240,958 962,926,264    
Liabilities 842,331,429 821,352,404    
Shareholders' equity 141,909,529 141,573,860 134,284,835 131,529,944
Total Liabilities and Shareholders' Equity 984,240,958 962,926,264    
Parent Company [Member]
       
Assets        
Cash in bank 313,000 2,088,000 1,975,000 8,621,000
Investment securities   4,182,000    
Investment in subsidiary 141,286,000 135,298,000    
Other assets 650,000 629,000    
Total Assets 142,249,000 142,197,000    
Liabilities 340,000 623,000    
Shareholders' equity 141,909,000 141,574,000    
Total Liabilities and Shareholders' Equity $ 142,249,000 $ 142,197,000