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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance $ 7,077 $ 6,712 $ 7,001 $ 6,265 $ 6,265
Charge Offs (111) (218) (208) (476) (550)
Recoveries 24 29 97 107 156
Provision (Credit) 99 308 197 924 1,121
Other Non-interest expense related to unfunded 9 8 11 19  
Ending Balance 7,098 6,839 7,098 6,839 7,001
Ending balance: individually evaluated for impairment 123 125 123 125  
Ending balance: collectively evaluated for impairment 6,975 6,714 6,975 6,714  
Ending balance: loans acquired with deteriorated credit quality   1   1  
FINANCING RECEIVABLES:          
Ending balance 795,205 737,057 795,205 737,057 758,094
Ending balance: individually evaluated for impairment 1,979 1,406 1,979 1,406  
Ending balance: collectively evaluated for impairment 793,226 735,651 793,226 735,651  
Agricultural Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 253 229 241 211 211
Provision (Credit) (5) 5 7 23  
Ending Balance 248 234 248 234 241
Ending balance: collectively evaluated for impairment 248 234 248 234  
FINANCING RECEIVABLES:          
Ending balance 63,571 59,458 63,571 59,458 62,336
Ending balance: individually evaluated for impairment 205 132 205 132  
Ending balance: collectively evaluated for impairment 63,366 59,326 63,366 59,326  
Agricultural [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 596 591 616 582 582
Charge Offs   (3)   (21)  
Recoveries   4 2 9  
Provision (Credit) 17 (12) (5) 10  
Ending Balance 613 580 613 580 616
Ending balance: collectively evaluated for impairment 613 580 613 580  
FINANCING RECEIVABLES:          
Ending balance 87,239 79,332 87,239 79,332 84,692
Ending balance: individually evaluated for impairment 161   161    
Ending balance: collectively evaluated for impairment 87,078 79,332 87,078 79,332  
Commercial And Industrial and Industrial Development Bonds [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 1,352 1,215 1,318 1,229 1,229
Charge Offs       (20)  
Recoveries 2 3 8 8  
Provision (Credit) 38 (23) 66 (22)  
Ending Balance 1,392 1,195 1,392 1,195 1,318
Ending balance: individually evaluated for impairment 31 22 31 22  
Ending balance: collectively evaluated for impairment 1,361 1,173 1,361 1,173  
FINANCING RECEIVABLES:          
Ending balance 130,720 111,953 130,720 111,953 115,093
Ending balance: individually evaluated for impairment 113 118 113 118  
Ending balance: collectively evaluated for impairment 130,607 111,835 130,607 111,835  
Unfunded Loan Commitment & Letters of Credit [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 219 219 217 208 208
Other Non-interest expense related to unfunded 9 8 11 19  
Ending Balance 228 227 228 227 217
Ending balance: collectively evaluated for impairment 228 227 228 227  
Receivables Acquired with Deteriorated Credit Quality [Member]          
FINANCING RECEIVABLES:          
Ending balance: loans acquired with deteriorated credit quality 194 265 194 265  
Consumer Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 250 413 316 338 338
Charge Offs   (42)   (106)  
Recoveries   1 13 23  
Provision (Credit) 26 (86) (53) 31  
Ending Balance 276 286 276 286 316
Ending balance: individually evaluated for impairment 25 35 25 35  
Ending balance: collectively evaluated for impairment 251 251 251 251  
Ending balance: loans acquired with deteriorated credit quality   1   1  
FINANCING RECEIVABLES:          
Ending balance 83,875 85,977 83,875 85,977 85,873
Ending balance: individually evaluated for impairment 1,012 712 1,012 712  
Ending balance: collectively evaluated for impairment 82,863 85,265 82,863 85,265  
Consumer Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
FINANCING RECEIVABLES:          
Ending balance: loans acquired with deteriorated credit quality 194 265 194 265  
Commercial Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 3,076 2,717 3,250 2,516 2,516
Charge Offs (19) (90) (19) (93)  
Recoveries 4 2 11 7  
Provision (Credit) 56 376 (125) 575  
Ending Balance 3,117 3,005 3,117 3,005 3,250
Ending balance: individually evaluated for impairment 67 68 67 68  
Ending balance: collectively evaluated for impairment 3,050 2,937 3,050 2,937  
FINANCING RECEIVABLES:          
Ending balance 393,913 369,721 393,913 369,721 376,887
Ending balance: individually evaluated for impairment 488 444 488 444  
Ending balance: collectively evaluated for impairment 393,425 369,277 393,425 369,277  
Consumer [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 407 365 394 337 337
Charge Offs (92) (83) (189) (236)  
Recoveries 18 19 63 60  
Provision (Credit) 90 59 155 199  
Ending Balance 423 360 423 360 394
Ending balance: collectively evaluated for impairment 423 360 423 360  
FINANCING RECEIVABLES:          
Ending balance 35,887 30,616 35,887 30,616 33,213
Ending balance: collectively evaluated for impairment 35,887 30,616 35,887 30,616  
Unallocated [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 924 963 649 844 844
Provision (Credit) (123) (11) 152 108  
Ending Balance 801 952 801 952 $ 649
Ending balance: collectively evaluated for impairment $ 801 $ 952 $ 801 $ 952