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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance $ 7,053 $ 7,104 $ 7,049 $ 7,095 $ 7,095
Charge Offs (219) (123) (554) (450) (580)
Recoveries 48 42 128 118 163
Provision (Credit) 247 47 410 219 324
Other Non-interest expense related to unfunded 60 18 156 106  
Ending Balance 7,189 7,088 7,189 7,088 7,049
Ending balance: individually evaluated for impairment 187 148 187 148 31
Ending balance: collectively evaluated for impairment 7,002 6,940 7,002 6,940 7,018
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0 0
FINANCING RECEIVABLES:          
Ending balance 1,158,696 838,698 1,158,696 838,698 846,374
Ending balance: individually evaluated for impairment 3,228 2,811 3,228 2,811 2,054
Ending balance: collectively evaluated for impairment 1,155,421 835,769 1,155,421 835,769 844,204
Ending balance: loans acquired with deteriorated credit quality 47 118 47 118 116
Consumer Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 275 251 247 343 343
Charge Offs (39) (29) (95) (63)  
Recoveries   18   18  
Provision (Credit) 38 (5) 122 (63)  
Ending Balance 274 235 274 235 247
Ending balance: individually evaluated for impairment 22 26 22 26 26
Ending balance: collectively evaluated for impairment 252 209 252 209 221
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0 0
FINANCING RECEIVABLES:          
Ending balance 158,458 82,629 158,458 82,629 80,232
Ending balance: individually evaluated for impairment 752 763 752 763 757
Ending balance: collectively evaluated for impairment 157,659 81,748 157,659 81,748 79,359
Ending balance: loans acquired with deteriorated credit quality 47 118 47 118 116
Agricultural Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 340 255 250 244 244
Provision (Credit) 12 (3) 102 8  
Ending Balance 352 252 352 252 250
Ending balance: collectively evaluated for impairment 352 252 352 252 250
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0 0
FINANCING RECEIVABLES:          
Ending balance 200,625 68,524 200,625 68,524 68,588
Ending balance: individually evaluated for impairment 406   406    
Ending balance: collectively evaluated for impairment 200,219 68,524 200,219 68,524 68,588
Agricultural [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 756 751 768 667 667
Charge Offs (22)   (22)    
Recoveries 1   3 6  
Provision (Credit) (2) (8) (16) 70  
Ending Balance 733 743 733 743 768
Ending balance: collectively evaluated for impairment 733 743 733 743 768
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0 0
FINANCING RECEIVABLES:          
Ending balance 110,405 103,760 110,405 103,760 108,616
Ending balance: individually evaluated for impairment 368   368    
Ending balance: collectively evaluated for impairment 110,037 103,760 110,037 103,760 108,616
Commercial Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 3,320 3,260 3,217 3,149 3,149
Charge Offs       (15)  
Recoveries 2 3 7 7  
Provision (Credit) (17) 9 81 131  
Ending Balance 3,305 3,272 3,305 3,272 3,217
Ending balance: collectively evaluated for impairment 3,305 3,272 3,305 3,272 3,217
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0 0
FINANCING RECEIVABLES:          
Ending balance 501,095 416,632 501,095 416,632 419,131
Ending balance: individually evaluated for impairment 304 196 304 196 194
Ending balance: collectively evaluated for impairment 500,791 416,436 500,791 416,436 418,937
Commercial and Industrial [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 1,461 1,420 1,305 1,546 1,546
Charge Offs (55)   (55) (100)  
Recoveries 13 3 21 8  
Provision (Credit) 131 (25) 279 (56)  
Ending Balance 1,550 1,398 1,550 1,398 1,305
Ending balance: individually evaluated for impairment 165 122 165 122 5
Ending balance: collectively evaluated for impairment 1,385 1,276 1,385 1,276 1,300
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0 0
FINANCING RECEIVABLES:          
Ending balance 138,395 125,612 138,395 125,612 127,752
Ending balance: individually evaluated for impairment 1,398 1,852 1,398 1,852 1,103
Ending balance: collectively evaluated for impairment 136,997 123,760 136,997 123,760 126,649
Consumer [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 526 459 484 441 441
Charge Offs (103) (94) (382) (272)  
Recoveries 32 18 97 79  
Provision (Credit) 90 88 346 223  
Ending Balance 545 471 545 471 484
Ending balance: collectively evaluated for impairment 545 471 545 471 484
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0 0
FINANCING RECEIVABLES:          
Ending balance 49,718 41,541 49,718 41,541 42,055
Ending balance: collectively evaluated for impairment 49,718 41,541 49,718 41,541 42,055
Unallocated [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 5 393 504 478 478
Provision (Credit) (5) (9) (504) (94)  
Ending Balance   384   384 504
Ending balance: collectively evaluated for impairment   384   384 504
Ending balance: loans acquired with deteriorated credit quality 0 0 0 0 0
Unfunded Loan Commitment & Letters of Credit [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 370 315 274 227 227
Other Non-interest expense related to unfunded 60 18 156 106  
Ending Balance 430 333 430 333 274
Ending balance: collectively evaluated for impairment 430 333 430 333 274
Ending balance: loans acquired with deteriorated credit quality $ 0 $ 0 $ 0 $ 0 $ 0