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Fair Value, Estimated fair value (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Carrying Amount [Member]
   
Assets:    
Cash and cash equivalents $ 55,904 $ 29,236
Investment securities available for sale 281,785 321,388
Other investments 5,599 5,712
Mortgage loans held for sale 5,984 5,146
Loans, net 604,690 653,893
Cash surrender value of life insurance 13,142 12,835
Liabilities:    
Deposits and demand notes payable 768,470 827,111
Securities sold under agreements to repurchase 43,136 39,600
FHLB borrowings 70,000 70,000
Junior subordinated debentures 20,619 20,619
Estimated Fair Value [Member]
   
Assets:    
Cash and cash equivalents 55,904 29,236
Investment securities available for sale 281,785 321,388
Other investments 5,599 5,712
Mortgage loans held for sale 5,984 5,146
Loans, net 604,690 648,640
Cash surrender value of life insurance 13,142 12,835
Liabilities:    
Deposits and demand notes payable 767,543 826,810
Securities sold under agreements to repurchase 43,136 39,600
FHLB borrowings 75,938 75,046
Junior subordinated debentures 20,619 20,619
Level 1 Valuation [Member] | Estimated Fair Value [Member]
   
Assets:    
Cash and cash equivalents 55,904  
Investment securities available for sale 1,455  
Other investments 0  
Mortgage loans held for sale 0  
Loans, net 0  
Cash surrender value of life insurance 0  
Liabilities:    
Deposits and demand notes payable 0  
Securities sold under agreements to repurchase 0  
FHLB borrowings 0  
Junior subordinated debentures 0  
Level 2 Valuation [Member] | Estimated Fair Value [Member]
   
Assets:    
Cash and cash equivalents 0  
Investment securities available for sale 279,080  
Other investments 0  
Mortgage loans held for sale 0  
Loans, net 0  
Cash surrender value of life insurance 13,142  
Liabilities:    
Deposits and demand notes payable 767,543  
Securities sold under agreements to repurchase 43,136  
FHLB borrowings 75,938  
Junior subordinated debentures 20,619  
Level 3 Valuation [Member] | Estimated Fair Value [Member]
   
Assets:    
Cash and cash equivalents 0  
Investment securities available for sale 1,250  
Other investments 5,599  
Mortgage loans held for sale 5,984  
Loans, net 604,690  
Cash surrender value of life insurance 0  
Liabilities:    
Deposits and demand notes payable 0  
Securities sold under agreements to repurchase 0  
FHLB borrowings 0  
Junior subordinated debentures $ 0