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Loans - Analysis of Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
ALLOWANCE FOR CREDIT LOSSES:                      
Beginning balance       $ 7,095       $ 7,001 $ 7,095 $ 7,001  
Charge Offs                 (580) (288) $ (550)
Recoveries                 163 150 156
Provision (Credit) $ 105 $ 47 $ 132 40 $ 25 $ 99 $ 25 73 324 222 1,121
Other Non-interest expense related to unfunded                 47 10  
Ending Balance 7,049       7,095       7,049 7,095 7,001
Ending balance: individually evaluated for impairment 31       106       31 106  
Ending balance: collectively evaluated for impairment 7,018       6,989       7,018 6,989  
Ending balance: loans acquired with deteriorated credit quality 0       0       0 0  
FINANCING RECEIVABLES:                      
Ending balance 846,374       823,024       846,374 823,024  
Ending balance: individually evaluated for impairment 2,054       1,745       2,054 1,745  
Ending balance: collectively evaluated for impairment 844,320       821,279       844,320 821,279  
Consumer Real Estate [Member]                      
ALLOWANCE FOR CREDIT LOSSES:                      
Beginning balance       343       316 343 316  
Charge Offs                 (63) (4)  
Recoveries                 18 13  
Provision (Credit)                 (51) 18  
Ending Balance 247       343       247 343 316
Ending balance: individually evaluated for impairment 26       21       26 21  
Ending balance: collectively evaluated for impairment 221       322       221 322  
Ending balance: loans acquired with deteriorated credit quality 0       0       0 0  
FINANCING RECEIVABLES:                      
Ending balance 80,232       83,200       80,232 83,200  
Ending balance: individually evaluated for impairment 757       575       757 575  
Ending balance: collectively evaluated for impairment 79,475       82,625       79,475 82,625  
Agricultural Real Estate [Member]                      
ALLOWANCE FOR CREDIT LOSSES:                      
Beginning balance       244       241 244 241  
Provision (Credit)                 6 3  
Ending Balance 250       244       250 244 241
Ending balance: collectively evaluated for impairment 250       244       250 244  
Ending balance: loans acquired with deteriorated credit quality 0       0       0 0  
FINANCING RECEIVABLES:                      
Ending balance 68,588       64,044       68,588 64,044  
Ending balance: individually evaluated for impairment         101         101  
Ending balance: collectively evaluated for impairment 68,588       63,943       68,588 63,943  
Agricultural [Member]                      
ALLOWANCE FOR CREDIT LOSSES:                      
Beginning balance       667       616 667 616  
Recoveries                 8 8  
Provision (Credit)                 93 43  
Ending Balance 768       667       768 667 616
Ending balance: collectively evaluated for impairment 768       667       768 667  
Ending balance: loans acquired with deteriorated credit quality 0       0       0 0  
FINANCING RECEIVABLES:                      
Ending balance 108,616       95,238       108,616 95,238  
Ending balance: collectively evaluated for impairment 108,616       95,238       108,616 95,238  
Commercial Real Estate [Member]                      
ALLOWANCE FOR CREDIT LOSSES:                      
Beginning balance       3,149       3,250 3,149 3,250  
Charge Offs                 (16) (21)  
Recoveries                 10 15  
Provision (Credit)                 74 (95)  
Ending Balance 3,217       3,149       3,217 3,149 3,250
Ending balance: individually evaluated for impairment         46         46  
Ending balance: collectively evaluated for impairment 3,217       3,103       3,217 3,103  
Ending balance: loans acquired with deteriorated credit quality 0       0       0 0  
FINANCING RECEIVABLES:                      
Ending balance 419,131       409,953       419,131 409,953  
Ending balance: individually evaluated for impairment 194       625       194 625  
Ending balance: collectively evaluated for impairment 418,937       409,328       418,937 409,328  
Commercial and Industrial [Member]                      
ALLOWANCE FOR CREDIT LOSSES:                      
Beginning balance       1,546       1,318 1,546 1,318  
Charge Offs                 (142)    
Recoveries                 13 12  
Provision (Credit)                 (112) 216  
Ending Balance 1,305       1,546       1,305 1,546 1,318
Ending balance: individually evaluated for impairment 5       39       5 39  
Ending balance: collectively evaluated for impairment 1,300       1,507       1,300 1,507  
Ending balance: loans acquired with deteriorated credit quality 0       0       0 0  
FINANCING RECEIVABLES:                      
Ending balance 127,752       132,787       127,752 132,787  
Ending balance: individually evaluated for impairment 1,103       444       1,103 444  
Ending balance: collectively evaluated for impairment 126,649       132,343       126,649 132,343  
Consumer [Member]                      
ALLOWANCE FOR CREDIT LOSSES:                      
Beginning balance       441       394 441 394  
Charge Offs                 (359) (263)  
Recoveries                 114 102  
Provision (Credit)                 288 208  
Ending Balance 484       441       484 441 394
Ending balance: collectively evaluated for impairment 484       441       484 441  
Ending balance: loans acquired with deteriorated credit quality 0       0       0 0  
FINANCING RECEIVABLES:                      
Ending balance 42,055       37,802       42,055 37,802  
Ending balance: collectively evaluated for impairment 42,055       37,802       42,055 37,802  
Unallocated [Member]                      
ALLOWANCE FOR CREDIT LOSSES:                      
Beginning balance       478       649 478 649  
Provision (Credit)                 26 (171)  
Ending Balance 504       478       504 478 649
Ending balance: collectively evaluated for impairment 504       478       504 478  
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       $ 227       $ 217 227 217  
Other Non-interest expense related to unfunded                 47 10  
Ending Balance 274       227       274 227 $ 217
Ending balance: collectively evaluated for impairment 274       227       274 227  
Ending balance: loans acquired with deteriorated credit quality $ 0       $ 0       $ 0 $ 0