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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | $ 7,104 | $ 7,077 | $ 7,095 | $ 7,001 | $ 7,001
Charge Offs | (123) | (111) | (450) | (208) | (288)
Recoveries | 42 | 24 | 118 | 97 | 150
Provision (Credit) | 47 | 99 | 219 | 197 | 222
Other Non-interest expense related to unfunded | 18 | 9 | 106 | 11 |
Ending Balance | 7,088 | 7,098 | 7,088 | 7,098 | 7,095
Ending balance: individually evaluated for impairment | 148 | 123 | 148 | 123 |
Ending balance: collectively evaluated for impairment | 6,940 | 6,975 | 6,940 | 6,975 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 838,698 | 795,205 | 838,698 | 795,205 | 823,024
Ending balance: individually evaluated for impairment | 2,811 | 1,979 | 2,811 | 1,979 |
Ending balance: collectively evaluated for impairment | 835,887 | 793,226 | 835,887 | 793,226 |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance: loans acquired with deteriorated credit quality | 118 | 194 | 118 | 194 |
Consumer Real Estate [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 251 | 250 | 343 | 316 | 316
Charge Offs | (29) |  | (63) |  |
Recoveries | 18 |  | 18 | 13 |
Provision (Credit) | (5) | 26 | (63) | (53) |
Ending Balance | 235 | 276 | 235 | 276 | 343
Ending balance: individually evaluated for impairment | 26 | 25 | 26 | 25 |
Ending balance: collectively evaluated for impairment | 209 | 251 | 209 | 251 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 82,629 | 83,875 | 82,629 | 83,875 | 83,200
Ending balance: individually evaluated for impairment | 763 | 1,012 | 763 | 1,012 |
Ending balance: collectively evaluated for impairment | 81,866 | 82,863 | 81,866 | 82,863 |
Consumer Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance: loans acquired with deteriorated credit quality | 118 | 194 | 118 | 194 |
Agricultural Real Estate [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 255 | 253 | 244 | 241 | 241
Provision (Credit) | (3) | (5) | 8 | 7 |
Ending Balance | 252 | 248 | 252 | 248 | 244
Ending balance: collectively evaluated for impairment | 252 | 248 | 252 | 248 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 68,524 | 63,571 | 68,524 | 63,571 | 64,044
Ending balance: individually evaluated for impairment |  | 205 |  | 205 |
Ending balance: collectively evaluated for impairment | 68,524 | 63,366 | 68,524 | 63,366 |
Agricultural [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 751 | 596 | 667 | 616 | 616
Recoveries |  |  | 6 | 2 |
Provision (Credit) | (8) | 17 | 70 | (5) |
Ending Balance | 743 | 613 | 743 | 613 | 667
Ending balance: collectively evaluated for impairment | 743 | 613 | 743 | 613 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 103,760 | 87,239 | 103,760 | 87,239 | 95,238
Ending balance: individually evaluated for impairment |  | 161 |  | 161 |
Ending balance: collectively evaluated for impairment | 103,760 | 87,078 | 103,760 | 87,078 |
Commercial Real Estate [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 3,260 | 3,076 | 3,149 | 3,250 | 3,250
Charge Offs |  | (19) | (15) | (19) |
Recoveries | 3 | 4 | 7 | 11 |
Provision (Credit) | 9 | 56 | 131 | (125) |
Ending Balance | 3,272 | 3,117 | 3,272 | 3,117 | 3,149
Ending balance: individually evaluated for impairment |  | 67 |  | 67 |
Ending balance: collectively evaluated for impairment | 3,272 | 3,050 | 3,272 | 3,050 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 416,632 | 393,913 | 416,632 | 393,913 | 409,953
Ending balance: individually evaluated for impairment | 196 | 488 | 196 | 488 |
Ending balance: collectively evaluated for impairment | 416,436 | 393,425 | 416,436 | 393,425 |
Commercial and Industrial [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 1,420 | 1,352 | 1,546 | 1,318 | 1,318
Charge Offs |  |  | (100) |  |
Recoveries | 3 | 2 | 8 | 8 |
Provision (Credit) | (25) | 38 | (56) | 66 |
Ending Balance | 1,398 | 1,392 | 1,398 | 1,392 | 1,546
Ending balance: individually evaluated for impairment | 122 | 31 | 122 | 31 |
Ending balance: collectively evaluated for impairment | 1,276 | 1,361 | 1,276 | 1,361 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 125,612 | 130,720 | 125,612 | 130,720 | 132,787
Ending balance: individually evaluated for impairment | 1,852 | 113 | 1,852 | 113 |
Ending balance: collectively evaluated for impairment | 123,760 | 130,607 | 123,760 | 130,607 |
Consumer [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 459 | 407 | 441 | 394 | 394
Charge Offs | (94) | (92) | (272) | (189) |
Recoveries | 18 | 18 | 79 | 63 |
Provision (Credit) | 88 | 90 | 223 | 155 |
Ending Balance | 471 | 423 | 471 | 423 | 441
Ending balance: collectively evaluated for impairment | 471 | 423 | 471 | 423 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 41,541 | 35,887 | 41,541 | 35,887 | 37,802
Ending balance: collectively evaluated for impairment | 41,541 | 35,887 | 41,541 | 35,887 |
Unallocated [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 393 | 924 | 478 | 649 | 649
Provision (Credit) | (9) | (123) | (94) | 152 |
Ending Balance | 384 | 801 | 384 | 801 | 478
Ending balance: collectively evaluated for impairment | 384 | 801 | 384 | 801 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
Unfunded Loan Commitment & Letters of Credit [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 315 | 219 | 227 | 217 | 217
Other Non-interest expense related to unfunded | 18 | 9 | 106 | 11 |
Ending Balance | 333 | 228 | 333 | 228 | $ 227
Ending balance: collectively evaluated for impairment | 333 | 228 | 333 | 228 |
Ending balance: loans acquired with deteriorated credit quality | $ 0 | $ 0 | $ 0 | $ 0 |

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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