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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance $ 7,065 $ 7,069 $ 7,095 $ 7,001 $ 7,001
Charge Offs (182) (53) (327) (97) (288)
Recoveries 39 36 76 73 150
Provision (Credit) 132 25 172 98 222
Other Non-interest expense related to unfunded 50   88 2  
Ending Balance 7,104 7,077 7,104 7,077 7,095
Ending balance: individually evaluated for impairment 132 115 132 115  
Ending balance: collectively evaluated for impairment 6,972 6,962 6,972 6,962  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 831,015 790,838 831,015 790,838 823,024
Ending balance: individually evaluated for impairment 1,452 1,715 1,452 1,715  
Ending balance: collectively evaluated for impairment 829,563 789,123 829,563 789,123  
Receivables Acquired with Deteriorated Credit Quality [Member]          
FINANCING RECEIVABLES:          
Ending balance: loans acquired with deteriorated credit quality 119 196 119 196  
Agricultural Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 263 244 244 241 241
Provision (Credit) (8) 9 11 12  
Ending Balance 255 253 255 253 244
Ending balance: collectively evaluated for impairment 255 253 255 253  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 69,676 64,003 69,676 64,003 64,044
Ending balance: individually evaluated for impairment   101   101  
Ending balance: collectively evaluated for impairment 69,676 63,902 69,676 63,902  
Agricultural [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 706 634 667 616 616
Recoveries 3 1 6 2  
Provision (Credit) 42 (39) 78 (22)  
Ending Balance 751 596 751 596 667
Ending balance: collectively evaluated for impairment 751 596 751 596  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 104,980 83,771 104,980 83,771 95,238
Ending balance: collectively evaluated for impairment 104,980 83,771 104,980 83,771  
Commercial And Industrial and Industrial Development Bonds [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 1,443 1,299 1,546 1,318 1,318
Charge Offs (100)   (100)    
Recoveries 3 3 6 6  
Provision (Credit) 74 50 (32) 28  
Ending Balance 1,420 1,352 1,420 1,352 1,546
Ending balance: individually evaluated for impairment 86 33 86 33  
Ending balance: collectively evaluated for impairment 1,334 1,319 1,334 1,319  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 122,510 129,675 122,510 129,675 132,787
Ending balance: individually evaluated for impairment 394 114 394 114  
Ending balance: collectively evaluated for impairment 122,116 129,561 122,116 129,561  
Unfunded Loan Commitment & Letters of Credit [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 265 219 227 217 217
Other Non-interest expense related to unfunded 50   88 2  
Ending Balance 315 219 315 219 227
Ending balance: collectively evaluated for impairment 315 219 315 219  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
Consumer Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 254 277 343 316 316
Charge Offs     (34)    
Recoveries   2   13  
Provision (Credit) (3) (29) (58) (79)  
Ending Balance 251 250 251 250 343
Ending balance: individually evaluated for impairment 46 25 46 25  
Ending balance: collectively evaluated for impairment 205 225 205 225  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 82,368 83,903 82,368 83,903 83,200
Ending balance: individually evaluated for impairment 860 1,008 860 1,008  
Ending balance: collectively evaluated for impairment 81,508 82,895 81,508 82,895  
Consumer Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
FINANCING RECEIVABLES:          
Ending balance: loans acquired with deteriorated credit quality 119 196 119 196  
Commercial Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 3,674 3,008 3,149 3,250 3,250
Charge Offs (1)   (16)    
Recoveries 2 5 4 7  
Provision (Credit) (415) 63 123 (181)  
Ending Balance 3,260 3,076 3,260 3,076 3,149
Ending balance: individually evaluated for impairment   57   57  
Ending balance: collectively evaluated for impairment 3,260 3,019 3,260 3,019  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 410,886 394,051 410,886 394,051 409,953
Ending balance: individually evaluated for impairment 198 492 198 492  
Ending balance: collectively evaluated for impairment 410,688 393,559 410,688 393,559  
Consumer [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 431 397 441 394 394
Charge Offs (81) (53) (177) (97)  
Recoveries 31 25 60 45  
Provision (Credit) 78 38 135 65  
Ending Balance 459 407 459 407 441
Ending balance: collectively evaluated for impairment 459 407 459 407  
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0  
FINANCING RECEIVABLES:          
Ending balance 40,595 35,435 40,595 35,435 37,802
Ending balance: collectively evaluated for impairment 40,595 35,435 40,595 35,435  
Unallocated [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 29 991 478 649 649
Provision (Credit) 364 (67) (85) 275  
Ending Balance 393 924 393 924 $ 478
Ending balance: collectively evaluated for impairment 393 924 393 924  
Ending balance: loans acquired with deteriorated credit quality $ 0 $ 0 $ 0 $ 0