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Loans (Details 10) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
ALLOWANCE FOR CREDIT LOSSES:        
Beginning Balance $ 5,177 $ 5,633 $ 5,221 $ 5,859
Charge Offs (240) (524) (639) (2,378)
Recoveries 103 80 240 288
Provision 235 93 442 1,522
Other Non-interest expense related to unfunded 8 12 19 3
Ending Balance 5,283 5,294 5,283 5,294
Ending balance: individually evaluated for impairment 452 101 452 101
Ending balance: collectively evaluated for impairment 4,831 5,193 4,831 5,193
Ending balance: loans acquired with deteriorated credit quality 1 2 1 2
FINANCING RECEIVABLES:        
Ending balance 491,304 505,464 491,304 505,464
Ending balance: individually evaluated for impairment 4,516 7,082 4,516 7,082
Ending balance: collectively evaluated for impairment 486,788 498,382 486,788 498,382
Ending balance: loans acquired with deteriorated credit quality 547 986 547 986
Consumer real estate [Member]
        
ALLOWANCE FOR CREDIT LOSSES:        
Beginning Balance 460 524 261 258
Charge Offs (92) (190) (185) (380)
Recoveries 23 25 52 48
Provision (37) (30) 225 403
Other Non-interest expense related to unfunded            
Ending Balance 354 329 354 329
Ending balance: individually evaluated for impairment 69 101 69 101
Ending balance: collectively evaluated for impairment 285 228 285 228
Ending balance: loans acquired with deteriorated credit quality 1 2 1 2
FINANCING RECEIVABLES:        
Ending balance 81,041 80,607 81,041 80,607
Ending balance: individually evaluated for impairment 964 479 964 479
Ending balance: collectively evaluated for impairment 80,077 80,128 80,077 80,128
Ending balance: loans acquired with deteriorated credit quality 547 986 547 986
Agricultural real estate [Member]
        
ALLOWANCE FOR CREDIT LOSSES:        
Beginning Balance 92 156 140 122
Charge Offs            
Recoveries            
Provision (1) (3) (49) 31
Other Non-interest expense related to unfunded            
Ending Balance 91 153 91 153
Ending balance: individually evaluated for impairment            
Ending balance: collectively evaluated for impairment 91 153 91 153
Ending balance: loans acquired with deteriorated credit quality            
FINANCING RECEIVABLES:        
Ending balance 32,221 31,806 32,221 31,806
Ending balance: individually evaluated for impairment            
Ending balance: collectively evaluated for impairment 32,221 31,806 32,221 31,806
Ending balance: loans acquired with deteriorated credit quality            
Agriculture [Member]
        
ALLOWANCE FOR CREDIT LOSSES:        
Beginning Balance 275 287 266 327
Charge Offs (6) (1) (6) (25)
Recoveries 1    11 65
Provision 14 (35) 13 (116)
Other Non-interest expense related to unfunded            
Ending Balance 284 251 284 251
Ending balance: individually evaluated for impairment            
Ending balance: collectively evaluated for impairment 284 251 284 251
Ending balance: loans acquired with deteriorated credit quality            
FINANCING RECEIVABLES:        
Ending balance 56,581 54,134 56,581 54,134
Ending balance: individually evaluated for impairment    5,036    5,036
Ending balance: collectively evaluated for impairment 56,581 49,098 56,581 49,098
Ending balance: loans acquired with deteriorated credit quality            
Commercial real estate [Member]
        
ALLOWANCE FOR CREDIT LOSSES:        
Beginning Balance 1,722 2,052 2,088 1,868
Charge Offs    (55) (97) (210)
Recoveries 3 1 5 30
Provision 64 28 (207) 338
Other Non-interest expense related to unfunded            
Ending Balance 1,789 2,026 1,789 2,026
Ending balance: individually evaluated for impairment            
Ending balance: collectively evaluated for impairment 1,789 2,026 1,789 2,026
Ending balance: loans acquired with deteriorated credit quality            
FINANCING RECEIVABLES:        
Ending balance 198,856 201,167 198,856 201,167
Ending balance: individually evaluated for impairment 807 1,567 807 1,567
Ending balance: collectively evaluated for impairment 198,049 199,600 198,049 199,600
Ending balance: loans acquired with deteriorated credit quality            
Commercial [Member]
        
ALLOWANCE FOR CREDIT LOSSES:        
Beginning Balance 1,856 2,047 1,947 2,354
Charge Offs    (180)    (1,496)
Recoveries 5 5 24 11
Provision 14 33 (96) 1,036
Other Non-interest expense related to unfunded            
Ending Balance 1,875 1,905 1,875 1,905
Ending balance: individually evaluated for impairment 383    383   
Ending balance: collectively evaluated for impairment 1,492 1,905 1,492 1,905
Ending balance: loans acquired with deteriorated credit quality            
FINANCING RECEIVABLES:        
Ending balance 101,553 113,889 101,553 113,889
Ending balance: individually evaluated for impairment 2,745    2,745   
Ending balance: collectively evaluated for impairment 98,808 113,889 98,808 113,889
Ending balance: loans acquired with deteriorated credit quality            
Consumer (incl. Credit Cards) [Member]
        
ALLOWANCE FOR CREDIT LOSSES:        
Beginning Balance 283 340 315 380
Charge Offs (142) (98) (351) (267)
Recoveries 71 49 148 134
Provision 58 24 159 68
Other Non-interest expense related to unfunded            
Ending Balance 270 315 270 315
Ending balance: individually evaluated for impairment            
Ending balance: collectively evaluated for impairment 270 315 270 315
Ending balance: loans acquired with deteriorated credit quality            
FINANCING RECEIVABLES:        
Ending balance 21,052 23,861 21,052 23,861
Ending balance: individually evaluated for impairment            
Ending balance: collectively evaluated for impairment 21,052 23,861 21,052 23,861
Ending balance: loans acquired with deteriorated credit quality            
Unfunded Loan Commitment and Letters of Credit [Member]
        
ALLOWANCE FOR CREDIT LOSSES:        
Beginning Balance 141 144 130 153
Charge Offs            
Recoveries            
Provision            
Other Non-interest expense related to unfunded 8 12 19 3
Ending Balance 149 156 149 156
Ending balance: individually evaluated for impairment            
Ending balance: collectively evaluated for impairment 149 156 149 156
Ending balance: loans acquired with deteriorated credit quality            
FINANCING RECEIVABLES:        
Ending balance            
Ending balance: individually evaluated for impairment            
Ending balance: collectively evaluated for impairment            
Ending balance: loans acquired with deteriorated credit quality            
Unallocated [Member]
        
ALLOWANCE FOR CREDIT LOSSES:        
Beginning Balance 348 83 74 397
Charge Offs            
Recoveries            
Provision 123 76 397 (238)
Other Non-interest expense related to unfunded            
Ending Balance 471 159 471 159
Ending balance: individually evaluated for impairment            
Ending balance: collectively evaluated for impairment 471 159 471 159
Ending balance: loans acquired with deteriorated credit quality            
FINANCING RECEIVABLES:        
Ending balance            
Ending balance: individually evaluated for impairment            
Ending balance: collectively evaluated for impairment            
Ending balance: loans acquired with deteriorated credit quality