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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance $ 6,712 $ 6,128 $ 6,265 $ 6,112 $ 6,112
Charge Offs (218) (177) (476) (798) (1,030)
Recoveries 29 172 107 518 557
Provision (Credit) 308 243 924 540  
Other Non-interest expense related to unfunded 8 (5) 19 (11)  
Ending Balance 6,839 6,361 6,839 6,361 6,265
Ending balance: individually evaluated for impairment 125 465 125 465  
Ending balance: collectively evaluated for impairment 6,714 5,896 6,714 5,896  
Ending balance: loans acquired with deteriorated credit quality 1 1 1 1  
FINANCING RECEIVABLES:          
Ending balance 738,682 635,239 738,682 635,239 685,878
Ending balance: individually evaluated for impairment 1,406 2,541 1,406 2,541  
Ending balance: collectively evaluated for impairment 737,276 632,698 737,276 632,698  
Agricultural Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 229 189 211 184 184
Provision (Credit) 5 7 23 12  
Ending Balance 234 196 234 196 211
Ending balance: collectively evaluated for impairment 234 196 234 196  
FINANCING RECEIVABLES:          
Ending balance 60,162 54,995 60,162 54,995 58,463
Ending balance: individually evaluated for impairment 132 222 132 222  
Ending balance: collectively evaluated for impairment 60,030 54,773 60,030 54,773  
Agricultural [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 591 519 582 547 547
Charge Offs (3)   (21)    
Recoveries 4 61 9 64  
Provision (Credit) (12) (60) 10 (91)  
Ending Balance 580 520 580 520 582
Ending balance: collectively evaluated for impairment 580 520 580 520  
FINANCING RECEIVABLES:          
Ending balance 79,332 73,310 79,332 73,310 82,762
Ending balance: collectively evaluated for impairment 79,332 73,310 79,332 73,310  
Commercial And Industrial and Industrial Development Bonds [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 1,215 1,288 1,229 1,421 1,421
Charge Offs   (79) (20) (468)  
Recoveries 3 66 8 88  
Provision (Credit) (23) (125) (22) 109  
Ending Balance 1,195 1,150 1,195 1,150 1,229
Ending balance: individually evaluated for impairment 22 188 22 188  
Ending balance: collectively evaluated for impairment 1,173 962 1,173 962  
FINANCING RECEIVABLES:          
Ending balance 111,953 91,114 111,953 91,114 106,689
Ending balance: individually evaluated for impairment 118 771 118 771  
Ending balance: collectively evaluated for impairment 111,835 90,343 111,835 90,343  
Unfunded Loan Commitment & Letters of Credit [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 219 201 208 207 207
Other Non-interest expense related to unfunded 8 (5) 19 (11)  
Ending Balance 227 196 227 196 208
Ending balance: collectively evaluated for impairment 227 196 227 196  
Receivables Acquired with Deteriorated Credit Quality [Member]          
FINANCING RECEIVABLES:          
Ending balance: loans acquired with deteriorated credit quality 265 512 265 512  
Consumer Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 413 309 338 537 537
Charge Offs (42)   (106)    
Recoveries 1 12 23 39  
Provision (Credit) (86) 32 31 (223)  
Ending Balance 286 353 286 353 338
Ending balance: individually evaluated for impairment 35 76 35 76  
Ending balance: collectively evaluated for impairment 251 277 251 277  
Ending balance: loans acquired with deteriorated credit quality 1 1 1 1  
FINANCING RECEIVABLES:          
Ending balance 86,898 88,020 86,898 88,020 87,947
Ending balance: individually evaluated for impairment 712 506 712 506  
Ending balance: collectively evaluated for impairment 86,186 87,514 86,186 87,514  
Consumer Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
FINANCING RECEIVABLES:          
Ending balance: loans acquired with deteriorated credit quality 265 512 265 512  
Commercial Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 2,717 2,286 2,516 2,367 2,367
Charge Offs (90) (25) (93) (111)  
Recoveries 2 1 7 203  
Provision (Credit) 376 144 575 (53)  
Ending Balance 3,005 2,406 3,005 2,406 2,516
Ending balance: individually evaluated for impairment 68 201 68 201  
Ending balance: collectively evaluated for impairment 2,937 2,205 2,937 2,205  
FINANCING RECEIVABLES:          
Ending balance 369,721 301,342 369,721 301,342 322,230
Ending balance: individually evaluated for impairment 444 1,042 444 1,042  
Ending balance: collectively evaluated for impairment 369,277 300,300 369,277 300,300  
Consumer [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 365 309 337 323 323
Charge Offs (83) (73) (236) (219)  
Recoveries 19 32 60 124  
Provision (Credit) 59 56 199 96  
Ending Balance 360 324 360 324 337
Ending balance: collectively evaluated for impairment 360 324 360 324  
FINANCING RECEIVABLES:          
Ending balance 30,616 26,458 30,616 26,458 27,787
Ending balance: collectively evaluated for impairment 30,616 26,458 30,616 26,458  
Unallocated [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 963 1,027 844 526 526
Provision (Credit) (11) 189 108 690  
Ending Balance 952 1,216 952 1,216 $ 844
Ending balance: collectively evaluated for impairment $ 952 $ 1,216 $ 952 $ 1,216