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Deposits (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Deposits      
Interest bearing demand $ 345,739,000 $ 297,916,000  
Savings 84,795,000 70,964,000  
Money market 579,686,000 526,605,000  
Time deposits greater than $250,000 45,888,000 44,707,000  
Other time deposits 329,426,000 363,960,000  
Total 1,385,534,000 1,304,152,000  
Interest expense related to certificates of deposit and other time deposits in denominations of $100,000 or more 1,855,000 2,575,000 3,445,000
Scheduled maturities of time deposits      
2013 241,535,000    
2014 75,875,000    
2015 31,273,000    
2016 15,283,000    
2017 and thereafter 11,348,000    
Total 375,314,000    
Deposits of directors and their associates, including deposits of companies for which directors are principal owners, and executive officers 29,819,000 3,800,000  
Deposits accounts in overdraft status and thus have been reclassified to loans $ 814,000 $ 482,000