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Loans - Analysis of Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance $ 7,069 $ 6,505 $ 7,001 $ 6,265 $ 6,265
Charge Offs (53) (174) (97) (258) (550)
Recoveries 36 43 73 78 156
Provision (Credit) 25 339 98 616 1,121
Other Non-interest expense related to unfunded   (1) 2 11  
Ending Balance 7,077 6,712 7,077 6,712 7,001
Ending balance: individually evaluated for impairment 115 217 115 217  
Ending balance: collectively evaluated for impairment 6,962 6,495 6,962 6,495  
Ending balance: loans acquired with deteriorated credit quality   1   1  
FINANCING RECEIVABLES:          
Ending balance 790,838 729,915 790,838 729,915 758,094
Ending balance: individually evaluated for impairment 1,715 1,619 1,715 1,619  
Ending balance: collectively evaluated for impairment 789,123 728,296 789,123 728,296  
Agricultural Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 244 272 241 211 211
Provision (Credit) 9 (43) 12 18  
Ending Balance 253 229 253 229 241
Ending balance: collectively evaluated for impairment 253 229 253 229  
FINANCING RECEIVABLES:          
Ending balance 64,003 60,203 64,003 60,203 62,336
Ending balance: individually evaluated for impairment 101 162 101 162  
Ending balance: collectively evaluated for impairment 63,902 60,041 63,902 60,041  
Agricultural [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 634 548 616 582 582
Charge Offs   (18)   (18)  
Recoveries 1 1 2 5  
Provision (Credit) (39) 60 (22) 22  
Ending Balance 596 591 596 591 616
Ending balance: collectively evaluated for impairment 596 591 596 591  
FINANCING RECEIVABLES:          
Ending balance 83,771 83,433 83,771 83,433 84,692
Ending balance: collectively evaluated for impairment 83,771 83,433 83,771 83,433  
Commercial And Industrial and Industrial Development Bonds [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 1,299 1,251 1,318 1,228 1,228
Charge Offs       (20)  
Recoveries 3 3 6 5  
Provision (Credit) 50 (39) 28 2  
Ending Balance 1,352 1,215 1,352 1,215 1,318
Ending balance: individually evaluated for impairment 33 66 33 66  
Ending balance: collectively evaluated for impairment 1,319 1,149 1,319 1,149  
FINANCING RECEIVABLES:          
Ending balance 129,675 110,386 129,675 110,386 115,093
Ending balance: individually evaluated for impairment 114 567 114 567  
Ending balance: collectively evaluated for impairment 129,561 109,819 129,561 109,819  
Unfunded Loan Commitment & Letters of Credit [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 219 220 217 208 208
Other Non-interest expense related to unfunded   (1) 2 11  
Ending Balance 219 219 219 219 217
Ending balance: collectively evaluated for impairment 219 219 219 219  
Receivables Acquired with Deteriorated Credit Quality [Member]          
FINANCING RECEIVABLES:          
Ending balance: loans acquired with deteriorated credit quality 196 410 196 410  
Consumer Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 277 457 316 339 339
Charge Offs   (63)   (64)  
Recoveries 2 19 13 21  
Provision (Credit) (29)   (79) 117  
Ending Balance 250 413 250 413 316
Ending balance: individually evaluated for impairment 25 61 25 61  
Ending balance: collectively evaluated for impairment 225 352 225 352  
Ending balance: loans acquired with deteriorated credit quality   1   1  
FINANCING RECEIVABLES:          
Ending balance 83,903 88,165 83,903 88,165 85,873
Ending balance: individually evaluated for impairment 1,008 454 1,008 454  
Ending balance: collectively evaluated for impairment 82,895 87,711 82,895 87,711  
Consumer Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
FINANCING RECEIVABLES:          
Ending balance: loans acquired with deteriorated credit quality 196 410 196 410  
Commercial Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 3,008 2,678 3,250 2,516 2,516
Charge Offs       (3)  
Recoveries 5 3 7 5  
Provision (Credit) 63 36 (181) 199  
Ending Balance 3,076 2,717 3,076 2,717 3,250
Ending balance: individually evaluated for impairment 57 90 57 90  
Ending balance: collectively evaluated for impairment 3,019 2,627 3,019 2,627  
FINANCING RECEIVABLES:          
Ending balance 394,051 357,243 394,051 357,243 376,887
Ending balance: individually evaluated for impairment 492 436 492 436  
Ending balance: collectively evaluated for impairment 393,559 356,807 393,559 356,807  
Consumer [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 397 335 394 337 337
Charge Offs (53) (93) (97) (153)  
Recoveries 25 17 45 42  
Provision (Credit) 38 106 65 139  
Ending Balance 407 365 407 365 394
Ending balance: collectively evaluated for impairment 407 365 407 365  
FINANCING RECEIVABLES:          
Ending balance 35,435 30,485 35,435 30,485 33,213
Ending balance: collectively evaluated for impairment 35,435 30,485 35,435 30,485  
Unallocated [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 991 744 649 844 844
Provision (Credit) (67) 219 275 119  
Ending Balance 924 963 924 963 $ 649
Ending balance: collectively evaluated for impairment $ 924 $ 963 $ 924 $ 963