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Fair Value, Estimated fair value (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Carrying Amount [Member]
   
Assets:    
Cash and cash equivalents $ 69,477 $ 29,236
Investment securities available for sale 280,735 321,388
Other investments 5,734 5,712
Mortgage loans held for sale 3,753 5,146
Loans, net 626,175 653,893
Cash surrender value of life insurance 13,040 12,835
Liabilities:    
Deposits and demand notes payable 780,546 827,111
Securities sold under agreements to repurchase 50,510 39,600
FHLB borrowings 70,000 70,000
Junior subordinated debentures 20,619 20,619
Fair Value [Member]
   
Assets:    
Cash and cash equivalents 69,477 29,236
Investment securities available for sale 280,735 321,388
Other investments 5,734 5,712
Mortgage loans held for sale 3,753 5,146
Loans, net 619,604 648,640
Cash surrender value of life insurance 13,040 12,835
Liabilities:    
Deposits and demand notes payable 779,500 826,810
Securities sold under agreements to repurchase 50,510 39,600
FHLB borrowings 75,508 75,046
Junior subordinated debentures 20,619 20,619
Level 1 Valuation [Member] | Fair Value [Member]
   
Assets:    
Cash and cash equivalents 69,477  
Investment securities available for sale 1,314  
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] | Fair Value [Member]
   
Assets:    
Cash and cash equivalents 0  
Investment securities available for sale 278,171  
Other investments 0  
Mortgage loans held for sale 0  
Loans, net 345  
Cash surrender value of life insurance 13,040  
Liabilities:    
Deposits and demand notes payable 779,500  
Securities sold under agreements to repurchase 50,510  
FHLB borrowings 75,508  
Junior subordinated debentures 20,619  
Level 3 Valuation [Member] | Fair Value [Member]
   
Assets:    
Cash and cash equivalents 0  
Investment securities available for sale 1,250  
Other investments 5,734  
Mortgage loans held for sale 3,753  
Loans, net 619,259  
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