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Loans - Analysis of Allowance for Credit Losses (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance $ 5,849 $ 5,484 $ 5,357 $ 5,386 $ 5,386
Charge Offs (95) (647) (630) (1,008) (1,262)
Recoveries 66 77 198 233 374
Provision (Credit) 282 303 1,154 582  
Other Non-interest expense related to unfunded 10 (18) 33 7  
Ending Balance 6,112 5,199 6,112 5,199 5,357
Ending balance: individually evaluated for impairment 252 422 252 422  
Ending balance: collectively evaluated for impairment 5,860 4,777 5,860 4,777  
Ending balance: loans acquired with deteriorated credit quality 2 2 2 2  
FINANCING RECEIVABLES:          
Ending balance 608,604 523,326 608,604 523,326 576,113
Ending balance: individually evaluated for impairment 1,686 1,561 1,686 1,561  
Ending balance: collectively evaluated for impairment 606,918 521,765 606,918 521,765  
Ending balance: loans acquired with deteriorated credit quality 527 539 527 539  
Consumer Real Estate [Member]
          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 569 361 257 368 368
Charge Offs 0 (12) (130) (112)  
Recoveries 11 6 28 15  
Provision (Credit) 218 52 643 136  
Other Non-interest expense related to unfunded 0 0 0 0  
Ending Balance 798 407 798 407  
Ending balance: individually evaluated for impairment 49 114 49 114  
Ending balance: collectively evaluated for impairment 749 293 749 293  
Ending balance: loans acquired with deteriorated credit quality 2 2 2 2  
FINANCING RECEIVABLES:          
Ending balance 97,651 79,268 97,651 79,268 92,438
Ending balance: individually evaluated for impairment 165 524 165 524  
Ending balance: collectively evaluated for impairment 97,486 78,744 97,486 78,744  
Ending balance: loans acquired with deteriorated credit quality 527 539 527 539  
Agricultural Real Estate [Member]
          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 125 115 131 113 113
Charge Offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision (Credit) 3 (1) (3) 1  
Other Non-interest expense related to unfunded 0 0 0 0  
Ending Balance 128 114 128 114  
Ending balance: individually evaluated for impairment 0 9 0 9  
Ending balance: collectively evaluated for impairment 128 105 128 105  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 48,812 37,758 48,812 37,758 44,301
Ending balance: individually evaluated for impairment 0 88 0 88  
Ending balance: collectively evaluated for impairment 48,812 37,670 48,812 37,670  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
Agricultural [Member]
          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 317 277 326 290 290
Charge Offs 0 0 0 0  
Recoveries 1 1 4 5  
Provision (Credit) 18 4 6 (13)  
Other Non-interest expense related to unfunded 0 0 0 0  
Ending Balance 336 282 336 282  
Ending balance: individually evaluated for impairment 0 0 0 0  
Ending balance: collectively evaluated for impairment 336 282 336 282  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 67,221 56,752 67,221 56,752 65,449
Ending balance: individually evaluated for impairment 0 0 0 0  
Ending balance: collectively evaluated for impairment 67,221 56,752 67,221 56,752  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
Commercial Real Estate [Member]
          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 1,886 1,460 2,107 1,749 1,749
Charge Offs 0 0 (230) (64)  
Recoveries 0 0 3 1  
Provision (Credit) (54) 523 (48) 297  
Other Non-interest expense related to unfunded 0 0 0 0  
Ending Balance 1,832 1,983 1,832 1,983  
Ending balance: individually evaluated for impairment 0 219 0 219  
Ending balance: collectively evaluated for impairment 1,832 1,764 1,832 1,764  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 274,074 232,104 274,074 232,104 248,893
Ending balance: individually evaluated for impairment 709 571 709 571  
Ending balance: collectively evaluated for impairment 273,365 231,533 273,365 231,533  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
Commercial and Industrial [Member]
          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 1,469 2,138 1,359 2,183 2,183
Charge Offs 0 (513) 0 (513)  
Recoveries 5 17 15 73  
Provision (Credit) (149) (313) (49) (414)  
Other Non-interest expense related to unfunded 0 0 0 0  
Ending Balance 1,325 1,329 1,325 1,329  
Ending balance: individually evaluated for impairment 203 80 203 80  
Ending balance: collectively evaluated for impairment 1,122 1,249 1,122 1,249  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 97,780 96,643 97,780 96,643 103,856
Ending balance: individually evaluated for impairment 812 378 812 378  
Ending balance: collectively evaluated for impairment 96,968 96,265 96,968 96,265  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
Consumer [Member]
          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 290 266 292 268 268
Charge Offs (95) (122) (270) (319)  
Recoveries 49 53 148 139  
Provision (Credit) 57 76 131 185  
Other Non-interest expense related to unfunded 0 0 0 0  
Ending Balance 301 273 301 273  
Ending balance: individually evaluated for impairment 0 0 0 0  
Ending balance: collectively evaluated for impairment 301 273 301 273  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 23,066 20,801 23,066 20,801 21,176
Ending balance: individually evaluated for impairment 0 0 0 0  
Ending balance: collectively evaluated for impairment 23,066 20,801 23,066 20,801  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
Unfunded Loan Commitment & Letters of Credit [Member]
          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 186 187 163 162 162
Charge Offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision (Credit) 0 0 0 0  
Other Non-interest expense related to unfunded 10 (18) 33 7  
Ending Balance 196 169 196 169  
Ending balance: individually evaluated for impairment 0 0 0 0  
Ending balance: collectively evaluated for impairment 196 169 196 169  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 0 0 0 0  
Ending balance: individually evaluated for impairment 0 0 0 0  
Ending balance: collectively evaluated for impairment 0 0 0 0  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
Unallocated [Member]
          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 1,007 680 722 253 253
Charge Offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision (Credit) 189 (38) 474 389  
Other Non-interest expense related to unfunded 0 0 0 0  
Ending Balance 1,196 642 1,196 642  
Ending balance: individually evaluated for impairment 0 0 0 0  
Ending balance: collectively evaluated for impairment 1,196 642 1,196 642  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 0 0 0 0  
Ending balance: individually evaluated for impairment 0 0 0 0  
Ending balance: collectively evaluated for impairment 0 0 0 0  
Ending balance: loans acquired with deteriorated credit quality $ 0 $ 0 $ 0 $ 0