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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance $ 6,505 $ 6,179 $ 6,265 $ 6,112 $ 6,112
Charge Offs (174) (529) (258) (621) (1,030)
Recoveries 43 296 78 346 557
Provision (Credit) 339 183 616 297  
Other Non-interest expense related to unfunded (1) (1) 11 (6)  
Ending Balance 6,712 6,128 6,712 6,128 6,265
Ending balance: individually evaluated for impairment 217 475 217 475  
Ending balance: collectively evaluated for impairment 6,495 5,653 6,495 5,653  
Ending balance: loans acquired with deteriorated credit quality 1 1 1 1  
FINANCING RECEIVABLES:          
Ending balance 731,691 620,591 731,691 620,591 685,878
Ending balance: individually evaluated for impairment 1,619 5,022 1,619 5,022  
Ending balance: collectively evaluated for impairment 730,072 615,569 730,072 615,569  
Agricultural Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 272 187 211 184 184
Provision (Credit) (43) 2 18 5  
Ending Balance 229 189 229 189 211
Ending balance: collectively evaluated for impairment 229 189 229 189  
FINANCING RECEIVABLES:          
Ending balance 61,353 52,614 61,353 52,614 58,463
Ending balance: individually evaluated for impairment 162 222 162 222  
Ending balance: collectively evaluated for impairment 61,191 52,392 61,191 52,392  
Agricultural [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 548 524 582 547 547
Charge Offs (18)   (18)    
Recoveries 1 2 5 3  
Provision (Credit) 60 (7) 22 (31)  
Ending Balance 591 519 591 519 582
Ending balance: collectively evaluated for impairment 591 519 591 519  
FINANCING RECEIVABLES:          
Ending balance 83,433 74,352 83,433 74,352 82,762
Ending balance: collectively evaluated for impairment 83,433 74,352 83,433 74,352  
Commercial And Industrial and Industrial Development Bonds [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 1,251 1,419 1,229 1,421 1,421
Charge Offs   (389) (20) (390)  
Recoveries 3 17 5 23  
Provision (Credit) (39) 241 2 234  
Ending Balance 1,215 1,288 1,215 1,288 1,229
Ending balance: individually evaluated for impairment 66 201 66 201  
Ending balance: collectively evaluated for impairment 1,149 1,087 1,149 1,087  
FINANCING RECEIVABLES:          
Ending balance 110,386 102,822 110,386 102,822 106,689
Ending balance: individually evaluated for impairment 567 1,323 567 1,323  
Ending balance: collectively evaluated for impairment 109,819 101,499 109,819 101,499  
Unfunded Loan Commitment & Letters of Credit [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 220 202 208 207 207
Other Non-interest expense related to unfunded (1) (1) 11 (6)  
Ending Balance 219 201 219 201 208
Ending balance: collectively evaluated for impairment 219 201 219 201  
Receivables Acquired with Deteriorated Credit Quality [Member]          
FINANCING RECEIVABLES:          
Ending balance: loans acquired with deteriorated credit quality 410 517 410 517  
Consumer Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 457 497 338 537 537
Charge Offs (63)   (64)    
Recoveries 19 25 21 27  
Provision (Credit)   (213) 117 (255)  
Ending Balance 413 309 413 309 338
Ending balance: individually evaluated for impairment 61 39 61 39  
Ending balance: collectively evaluated for impairment 352 270 352 270  
Ending balance: loans acquired with deteriorated credit quality 1 1 1 1  
FINANCING RECEIVABLES:          
Ending balance 88,791 86,641 88,791 86,641 87,947
Ending balance: individually evaluated for impairment 454 678 454 678  
Ending balance: collectively evaluated for impairment 88,337 85,963 88,337 85,963  
Consumer Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
FINANCING RECEIVABLES:          
Ending balance: loans acquired with deteriorated credit quality 410 517 410 517  
Commercial Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 2,678 2,212 2,516 2,367 2,367
Charge Offs   (85) (3) (85)  
Recoveries 3 201 5 202  
Provision (Credit) 36 (42) 199 (198)  
Ending Balance 2,717 2,286 2,717 2,286 2,516
Ending balance: individually evaluated for impairment 90 235 90 235  
Ending balance: collectively evaluated for impairment 2,627 2,051 2,627 2,051  
FINANCING RECEIVABLES:          
Ending balance 357,243 279,002 357,243 279,002 322,230
Ending balance: individually evaluated for impairment 436 2,799 436 2,799  
Ending balance: collectively evaluated for impairment 356,807 276,203 356,807 276,203  
Consumer [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 335 284 337 323 323
Charge Offs (93) (55) (153) (146)  
Recoveries 17 51 42 91  
Provision (Credit) 106 29 139 41  
Ending Balance 365 309 365 309 337
Ending balance: collectively evaluated for impairment 365 309 365 309  
FINANCING RECEIVABLES:          
Ending balance 30,485 25,160 30,485 25,160 27,787
Ending balance: collectively evaluated for impairment 30,485 25,160 30,485 25,160  
Unallocated [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 744 854 844 526 526
Provision (Credit) 219 173 119 501  
Ending Balance 963 1,027 963 1,027 $ 844
Ending balance: collectively evaluated for impairment $ 963 $ 1,027 $ 963 $ 1,027