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Loans - Analysis of Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 7,095 |  |  |  | $ 7,001 | $ 7,095 | $ 7,001 |
Charge Offs |  |  |  |  |  |  |  |  | (580) | (288) | $ (550)
Recoveries |  |  |  |  |  |  |  |  | 163 | 150 | 156
Provision (Credit) | $ 105 | $ 47 | $ 132 | 40 | $ 25 | $ 99 | $ 25 | 73 | 324 | 222 | 1,121
Other Non-interest expense related to unfunded |  |  |  |  |  |  |  |  | 47 | 10 |
Ending Balance | 7,049 |  |  |  | 7,095 |  |  |  | 7,049 | 7,095 | 7,001
Ending balance: individually evaluated for impairment | 31 |  |  |  | 106 |  |  |  | 31 | 106 |
Ending balance: collectively evaluated for impairment | 7,018 |  |  |  | 6,989 |  |  |  | 7,018 | 6,989 |
Ending balance: loans acquired with deteriorated credit quality | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 846,374 |  |  |  | 823,024 |  |  |  | 846,374 | 823,024 |
Ending balance: individually evaluated for impairment | 2,054 |  |  |  | 1,745 |  |  |  | 2,054 | 1,745 |
Ending balance: collectively evaluated for impairment | 844,320 |  |  |  | 821,279 |  |  |  | 844,320 | 821,279 |
Consumer Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 343 |  |  |  | 316 | 343 | 316 |
Charge Offs |  |  |  |  |  |  |  |  | (63) | (4) |
Recoveries |  |  |  |  |  |  |  |  | 18 | 13 |
Provision (Credit) |  |  |  |  |  |  |  |  | (51) | 18 |
Ending Balance | 247 |  |  |  | 343 |  |  |  | 247 | 343 | 316
Ending balance: individually evaluated for impairment | 26 |  |  |  | 21 |  |  |  | 26 | 21 |
Ending balance: collectively evaluated for impairment | 221 |  |  |  | 322 |  |  |  | 221 | 322 |
Ending balance: loans acquired with deteriorated credit quality | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 80,232 |  |  |  | 83,200 |  |  |  | 80,232 | 83,200 |
Ending balance: individually evaluated for impairment | 757 |  |  |  | 575 |  |  |  | 757 | 575 |
Ending balance: collectively evaluated for impairment | 79,475 |  |  |  | 82,625 |  |  |  | 79,475 | 82,625 |
Agricultural Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 244 |  |  |  | 241 | 244 | 241 |
Provision (Credit) |  |  |  |  |  |  |  |  | 6 | 3 |
Ending Balance | 250 |  |  |  | 244 |  |  |  | 250 | 244 | 241
Ending balance: collectively evaluated for impairment | 250 |  |  |  | 244 |  |  |  | 250 | 244 |
Ending balance: loans acquired with deteriorated credit quality | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 68,588 |  |  |  | 64,044 |  |  |  | 68,588 | 64,044 |
Ending balance: individually evaluated for impairment |  |  |  |  | 101 |  |  |  |  | 101 |
Ending balance: collectively evaluated for impairment | 68,588 |  |  |  | 63,943 |  |  |  | 68,588 | 63,943 |
Agricultural [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 667 |  |  |  | 616 | 667 | 616 |
Recoveries |  |  |  |  |  |  |  |  | 8 | 8 |
Provision (Credit) |  |  |  |  |  |  |  |  | 93 | 43 |
Ending Balance | 768 |  |  |  | 667 |  |  |  | 768 | 667 | 616
Ending balance: collectively evaluated for impairment | 768 |  |  |  | 667 |  |  |  | 768 | 667 |
Ending balance: loans acquired with deteriorated credit quality | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 108,616 |  |  |  | 95,238 |  |  |  | 108,616 | 95,238 |
Ending balance: collectively evaluated for impairment | 108,616 |  |  |  | 95,238 |  |  |  | 108,616 | 95,238 |
Commercial Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 3,149 |  |  |  | 3,250 | 3,149 | 3,250 |
Charge Offs |  |  |  |  |  |  |  |  | (16) | (21) |
Recoveries |  |  |  |  |  |  |  |  | 10 | 15 |
Provision (Credit) |  |  |  |  |  |  |  |  | 74 | (95) |
Ending Balance | 3,217 |  |  |  | 3,149 |  |  |  | 3,217 | 3,149 | 3,250
Ending balance: individually evaluated for impairment |  |  |  |  | 46 |  |  |  |  | 46 |
Ending balance: collectively evaluated for impairment | 3,217 |  |  |  | 3,103 |  |  |  | 3,217 | 3,103 |
Ending balance: loans acquired with deteriorated credit quality | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 419,131 |  |  |  | 409,953 |  |  |  | 419,131 | 409,953 |
Ending balance: individually evaluated for impairment | 194 |  |  |  | 625 |  |  |  | 194 | 625 |
Ending balance: collectively evaluated for impairment | 418,937 |  |  |  | 409,328 |  |  |  | 418,937 | 409,328 |
Commercial and Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 1,546 |  |  |  | 1,318 | 1,546 | 1,318 |
Charge Offs |  |  |  |  |  |  |  |  | (142) |  |
Recoveries |  |  |  |  |  |  |  |  | 13 | 12 |
Provision (Credit) |  |  |  |  |  |  |  |  | (112) | 216 |
Ending Balance | 1,305 |  |  |  | 1,546 |  |  |  | 1,305 | 1,546 | 1,318
Ending balance: individually evaluated for impairment | 5 |  |  |  | 39 |  |  |  | 5 | 39 |
Ending balance: collectively evaluated for impairment | 1,300 |  |  |  | 1,507 |  |  |  | 1,300 | 1,507 |
Ending balance: loans acquired with deteriorated credit quality | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 127,752 |  |  |  | 132,787 |  |  |  | 127,752 | 132,787 |
Ending balance: individually evaluated for impairment | 1,103 |  |  |  | 444 |  |  |  | 1,103 | 444 |
Ending balance: collectively evaluated for impairment | 126,649 |  |  |  | 132,343 |  |  |  | 126,649 | 132,343 |
Consumer [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 441 |  |  |  | 394 | 441 | 394 |
Charge Offs |  |  |  |  |  |  |  |  | (359) | (263) |
Recoveries |  |  |  |  |  |  |  |  | 114 | 102 |
Provision (Credit) |  |  |  |  |  |  |  |  | 288 | 208 |
Ending Balance | 484 |  |  |  | 441 |  |  |  | 484 | 441 | 394
Ending balance: collectively evaluated for impairment | 484 |  |  |  | 441 |  |  |  | 484 | 441 |
Ending balance: loans acquired with deteriorated credit quality | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 42,055 |  |  |  | 37,802 |  |  |  | 42,055 | 37,802 |
Ending balance: collectively evaluated for impairment | 42,055 |  |  |  | 37,802 |  |  |  | 42,055 | 37,802 |
Unallocated [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 478 |  |  |  | 649 | 478 | 649 |
Provision (Credit) |  |  |  |  |  |  |  |  | 26 | (171) |
Ending Balance | 504 |  |  |  | 478 |  |  |  | 504 | 478 | 649
Ending balance: collectively evaluated for impairment | 504 |  |  |  | 478 |  |  |  | 504 | 478 |
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 |  |  |  | $ 227 |  |  |  | $ 217 | 227 | 217 |
Other Non-interest expense related to unfunded |  |  |  |  |  |  |  |  | 47 | 10 |
Ending Balance | 274 |  |  |  | 227 |  |  |  | 274 | 227 | $ 217
Ending balance: collectively evaluated for impairment | 274 |  |  |  | 227 |  |  |  | 274 | 227 |
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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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + 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)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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