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Loans (Details 8) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Consumer real estate [Member]
        
Loans individually evaluated for impairment by class of loans        
Recorded Investment $ 738 $ 1,052 $ 738 $ 1,052
Unpaid Principal Balance 780 1,061 780 1,061
Related Allowance 139 292 139 292
Average Recorded Investment 613 654 580 396
Interest Income Recognized    9 5 9
Consumer real estate [Member] | With no related allowance recorded [Member]
        
Loans individually evaluated for impairment by class of loans        
Recorded Investment 340 137 340 137
Unpaid Principal Balance 355 137 355 137
Related Allowance            
Average Recorded Investment 213 210 185   
Interest Income Recognized    6    6
Consumer real estate [Member] | With a specific allowance recorded [Member]
        
Loans individually evaluated for impairment by class of loans        
Recorded Investment 398 915 398 915
Unpaid Principal Balance 425 924 425 924
Related Allowance 139 292 139 292
Average Recorded Investment 400 444 395 396
Interest Income Recognized    3 5 3
Agricultural Real Estate [Member]
        
Loans individually evaluated for impairment by class of loans        
Recorded Investment            
Unpaid Principal Balance            
Related Allowance            
Average Recorded Investment    291    248
Interest Income Recognized    5    5
Agricultural Real Estate [Member] | With no related allowance recorded [Member]
        
Loans individually evaluated for impairment by class of loans        
Recorded Investment            
Unpaid Principal Balance            
Related Allowance            
Average Recorded Investment    291    248
Interest Income Recognized    5    5
Agricultural Real Estate [Member] | With a specific allowance recorded [Member]
        
Loans individually evaluated for impairment by class of loans        
Recorded Investment            
Unpaid Principal Balance            
Related Allowance            
Average Recorded Investment            
Interest Income Recognized            
Agriculture [Member]
        
Loans individually evaluated for impairment by class of loans        
Recorded Investment    4,900    4,900
Unpaid Principal Balance    4,900    4,900
Related Allowance            
Average Recorded Investment    4,582    2,531
Interest Income Recognized    1    1
Agriculture [Member] | With no related allowance recorded [Member]
        
Loans individually evaluated for impairment by class of loans        
Recorded Investment    4,900    4,900
Unpaid Principal Balance    4,900    4,900
Related Allowance            
Average Recorded Investment    4,582    2,531
Interest Income Recognized    1    1
Agriculture [Member] | With a specific allowance recorded [Member]
        
Loans individually evaluated for impairment by class of loans        
Recorded Investment            
Unpaid Principal Balance            
Related Allowance            
Average Recorded Investment            
Interest Income Recognized            
Commercial real estate [Member]
        
Loans individually evaluated for impairment by class of loans        
Recorded Investment 807 866 807 866
Unpaid Principal Balance 1,231 1,059 1,231 1,059
Related Allowance    25    25
Average Recorded Investment 871 1,794 890 1,671
Interest Income Recognized    8    12
Commercial real estate [Member] | With no related allowance recorded [Member]
        
Loans individually evaluated for impairment by class of loans        
Recorded Investment 207 760 207 760
Unpaid Principal Balance 384 953 384 953
Related Allowance            
Average Recorded Investment 207 1,506 207 1,466
Interest Income Recognized    8    12
Commercial real estate [Member] | With a specific allowance recorded [Member]
        
Loans individually evaluated for impairment by class of loans        
Recorded Investment 600 106 600 106
Unpaid Principal Balance 847 106 847 106
Related Allowance    25    25
Average Recorded Investment 664 288 683 205
Interest Income Recognized            
Commercial and industrial [Member]
        
Loans individually evaluated for impairment by class of loans        
Recorded Investment 2,805 1,148 2,805 1,148
Unpaid Principal Balance 2,805 2,193 2,805 2,193
Related Allowance 417    417   
Average Recorded Investment 1,284 695 888 854
Interest Income Recognized 1    2   
Commercial and industrial [Member] | With no related allowance recorded [Member]
        
Loans individually evaluated for impairment by class of loans        
Recorded Investment 364 1,148 364 1,148
Unpaid Principal Balance 364 1,148 364 1,148
Related Allowance            
Average Recorded Investment 122 100 61 50
Interest Income Recognized            
Commercial and industrial [Member] | With a specific allowance recorded [Member]
        
Loans individually evaluated for impairment by class of loans        
Recorded Investment 2,441    2,441   
Unpaid Principal Balance 2,441 1,045 2,441 1,045
Related Allowance 417    417   
Average Recorded Investment 1,162 595 827 804
Interest Income Recognized 1    2   
Consumer [Member]
        
Loans individually evaluated for impairment by class of loans        
Recorded Investment 4    4   
Unpaid Principal Balance 14    14   
Related Allowance 1    1   
Average Recorded Investment 4 4 4 2
Interest Income Recognized            
Consumer [Member] | With no related allowance recorded [Member]
        
Loans individually evaluated for impairment by class of loans        
Recorded Investment            
Unpaid Principal Balance 10    10   
Related Allowance            
Average Recorded Investment    4    2
Interest Income Recognized            
Consumer [Member] | With a specific allowance recorded [Member]
        
Loans individually evaluated for impairment by class of loans        
Recorded Investment 4    4   
Unpaid Principal Balance 4    4   
Related Allowance 1    1   
Average Recorded Investment 4    4   
Interest Income Recognized