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Loans - Analysis of Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance $ 7,104 $ 7,077 $ 7,095 $ 7,001 $ 7,001
Charge Offs (123) (111) (450) (208) (288)
Recoveries 42 24 118 97 150
Provision (Credit) 47 99 219 197 222
Other Non-interest expense related to unfunded 18 9 106 11  
Ending Balance 7,088 7,098 7,088 7,098 7,095
Ending balance: individually evaluated for impairment 148 123 148 123  
Ending balance: collectively evaluated for impairment 6,940 6,975 6,940 6,975  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 838,698 795,205 838,698 795,205 823,024
Ending balance: individually evaluated for impairment 2,811 1,979 2,811 1,979  
Ending balance: collectively evaluated for impairment 835,887 793,226 835,887 793,226  
Receivables Acquired with Deteriorated Credit Quality [Member]          
FINANCING RECEIVABLES:          
Ending balance: loans acquired with deteriorated credit quality 118 194 118 194  
Consumer Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 251 250 343 316 316
Charge Offs (29)   (63)    
Recoveries 18   18 13  
Provision (Credit) (5) 26 (63) (53)  
Ending Balance 235 276 235 276 343
Ending balance: individually evaluated for impairment 26 25 26 25  
Ending balance: collectively evaluated for impairment 209 251 209 251  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 82,629 83,875 82,629 83,875 83,200
Ending balance: individually evaluated for impairment 763 1,012 763 1,012  
Ending balance: collectively evaluated for impairment 81,866 82,863 81,866 82,863  
Consumer Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
FINANCING RECEIVABLES:          
Ending balance: loans acquired with deteriorated credit quality 118 194 118 194  
Agricultural Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 255 253 244 241 241
Provision (Credit) (3) (5) 8 7  
Ending Balance 252 248 252 248 244
Ending balance: collectively evaluated for impairment 252 248 252 248  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 68,524 63,571 68,524 63,571 64,044
Ending balance: individually evaluated for impairment   205   205  
Ending balance: collectively evaluated for impairment 68,524 63,366 68,524 63,366  
Agricultural [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 751 596 667 616 616
Recoveries     6 2  
Provision (Credit) (8) 17 70 (5)  
Ending Balance 743 613 743 613 667
Ending balance: collectively evaluated for impairment 743 613 743 613  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 103,760 87,239 103,760 87,239 95,238
Ending balance: individually evaluated for impairment   161   161  
Ending balance: collectively evaluated for impairment 103,760 87,078 103,760 87,078  
Commercial Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 3,260 3,076 3,149 3,250 3,250
Charge Offs   (19) (15) (19)  
Recoveries 3 4 7 11  
Provision (Credit) 9 56 131 (125)  
Ending Balance 3,272 3,117 3,272 3,117 3,149
Ending balance: individually evaluated for impairment   67   67  
Ending balance: collectively evaluated for impairment 3,272 3,050 3,272 3,050  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 416,632 393,913 416,632 393,913 409,953
Ending balance: individually evaluated for impairment 196 488 196 488  
Ending balance: collectively evaluated for impairment 416,436 393,425 416,436 393,425  
Commercial and Industrial [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 1,420 1,352 1,546 1,318 1,318
Charge Offs     (100)    
Recoveries 3 2 8 8  
Provision (Credit) (25) 38 (56) 66  
Ending Balance 1,398 1,392 1,398 1,392 1,546
Ending balance: individually evaluated for impairment 122 31 122 31  
Ending balance: collectively evaluated for impairment 1,276 1,361 1,276 1,361  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 125,612 130,720 125,612 130,720 132,787
Ending balance: individually evaluated for impairment 1,852 113 1,852 113  
Ending balance: collectively evaluated for impairment 123,760 130,607 123,760 130,607  
Consumer [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 459 407 441 394 394
Charge Offs (94) (92) (272) (189)  
Recoveries 18 18 79 63  
Provision (Credit) 88 90 223 155  
Ending Balance 471 423 471 423 441
Ending balance: collectively evaluated for impairment 471 423 471 423  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 41,541 35,887 41,541 35,887 37,802
Ending balance: collectively evaluated for impairment 41,541 35,887 41,541 35,887  
Unallocated [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 393 924 478 649 649
Provision (Credit) (9) (123) (94) 152  
Ending Balance 384 801 384 801 478
Ending balance: collectively evaluated for impairment 384 801 384 801  
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 315 219 227 217 217
Other Non-interest expense related to unfunded 18 9 106 11  
Ending Balance 333 228 333 228 $ 227
Ending balance: collectively evaluated for impairment 333 228 333 228  
Ending balance: loans acquired with deteriorated credit quality $ 0 $ 0 $ 0 $ 0