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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance $ 6,128 $ 5,849 $ 6,112 $ 5,357 $ 5,357
Charge Offs (177) (95) (798) (630) (778)
Recoveries 172 66 518 198 298
Provision (Credit) 243 282 540 1,154  
Other Non-interest expense related to unfunded (5) 10 (11) 33  
Ending Balance 6,361 6,112 6,361 6,112 6,112
Ending balance: individually evaluated for impairment 465 202 465 202  
Ending balance: collectively evaluated for impairment 5,896 5,860 5,896 5,860  
Ending balance: loans acquired with deteriorated credit quality 1 2 1 2  
FINANCING RECEIVABLES:          
Ending balance 635,239 608,604 635,239 608,604 621,926
Ending balance: individually evaluated for impairment 2,541 1,686 2,541 1,686  
Ending balance: collectively evaluated for impairment 632,698 606,918 632,698 606,918  
Ending balance: loans acquired with deteriorated credit quality   527   527  
Agricultural Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 189 125 184 131 131
Provision (Credit) 7 3 12 (3)  
Ending Balance 196 128 196 128 184
Ending balance: collectively evaluated for impairment 196 128 196 128  
FINANCING RECEIVABLES:          
Ending balance 54,995 48,812 54,995 48,812 50,895
Ending balance: individually evaluated for impairment 222   222    
Ending balance: collectively evaluated for impairment 54,773 48,812 54,773 48,812  
Agricultural [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 519 316 547 326 326
Recoveries 61 1 64 4  
Provision (Credit) (60) 18 (91) 6  
Ending Balance 520 335 520 335 547
Ending balance: collectively evaluated for impairment 520 335 520 335  
FINANCING RECEIVABLES:          
Ending balance 73,310 67,221 73,310 67,221 74,611
Ending balance: collectively evaluated for impairment 73,310 67,221 73,310 67,221  
Commercial And Industrial and Industrial Development Bonds [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 1,288 1,468 1,421 1,359 1,359
Charge Offs (79)   (468)    
Recoveries 66 5 88 15  
Provision (Credit) (125) (149) 109 (49)  
Ending Balance 1,150 1,324 1,150 1,324 1,421
Ending balance: individually evaluated for impairment 188 203 188 203  
Ending balance: collectively evaluated for impairment 962 1,121 962 1,121  
FINANCING RECEIVABLES:          
Ending balance 91,114 97,780 91,114 97,780 104,824
Ending balance: individually evaluated for impairment 771 812 771 812  
Ending balance: collectively evaluated for impairment 90,343 96,968 90,343 96,968  
Unfunded Loan Commitment & Letters of Credit [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 201 186 207 163 163
Other Non-interest expense related to unfunded (5) 10 (11) 33  
Ending Balance 196 196 196 196 207
Ending balance: collectively evaluated for impairment 196 196 196 196  
Receivables Acquired with Deteriorated Credit Quality [Member]          
FINANCING RECEIVABLES:          
Ending balance: loans acquired with deteriorated credit quality 512   512    
Consumer Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 309 569 537 257 257
Charge Offs       (130)  
Recoveries 12 11 39 28  
Provision (Credit) 32 218 (223) 643  
Ending Balance 353 798 353 798 537
Ending balance: individually evaluated for impairment 76 49 76 49  
Ending balance: collectively evaluated for impairment 277 749 277 749  
Ending balance: loans acquired with deteriorated credit quality 1 2 1 2  
FINANCING RECEIVABLES:          
Ending balance 88,020 97,651 88,020 97,651 97,550
Ending balance: individually evaluated for impairment 506 165 506 165  
Ending balance: collectively evaluated for impairment 87,514 97,486 87,514 97,486  
Ending balance: loans acquired with deteriorated credit quality   527   527  
Consumer Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]          
FINANCING RECEIVABLES:          
Ending balance: loans acquired with deteriorated credit quality 512   512    
Commercial Real Estate [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 2,286 1,887 2,367 2,107 2,107
Charge Offs (25)   (111) (230)  
Recoveries 1   203 3  
Provision (Credit) 144 (54) (53) (48)  
Ending Balance 2,406 1,833 2,406 1,833 2,367
Ending balance: individually evaluated for impairment 201   201    
Ending balance: collectively evaluated for impairment 2,205 1,833 2,205 1,833  
FINANCING RECEIVABLES:          
Ending balance 301,342 274,074 301,342 274,074 270,188
Ending balance: individually evaluated for impairment 1,042 709 1,042 709  
Ending balance: collectively evaluated for impairment 300,300 273,365 300,300 273,365  
Consumer [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 309 290 323 292 292
Charge Offs (73) (95) (219) (270)  
Recoveries 32 49 124 148  
Provision (Credit) 56 57 96 131  
Ending Balance 324 301 324 301 323
Ending balance: collectively evaluated for impairment 324 301 324 301  
FINANCING RECEIVABLES:          
Ending balance 26,458 23,066 26,458 23,066 23,858
Ending balance: collectively evaluated for impairment 26,458 23,066 26,458 23,066  
Unallocated [Member]          
ALLOWANCE FOR CREDIT LOSSES:          
Beginning balance 1,027 1,008 526 722 722
Provision (Credit) 189 189 690 474  
Ending Balance 1,216 1,197 1,216 1,197 $ 526
Ending balance: collectively evaluated for impairment $ 1,216 $ 1,197 $ 1,216 $ 1,197