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Loans - Analysis of Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 7,001 |  |  |  | $ 6,265 | $ 7,001 | $ 6,265 |
Charge Offs |  |  |  |  |  |  |  |  | (288) | (550) | $ (1,030)
Recoveries |  |  |  |  |  |  |  |  | 150 | 156 | 557
Provision (Credit) | $ 25 | $ 99 | $ 25 | 73 | $ 197 | $ 308 | $ 339 | 277 | 222 | 1,121 | 625
Other Non-interest expense related to unfunded |  |  |  |  |  |  |  |  | 10 | 9 |
Ending Balance | 7,095 |  |  |  | 7,001 |  |  |  | 7,095 | 7,001 | 6,265
Ending balance: individually evaluated for impairment | 106 |  |  |  | 135 |  |  |  | 106 | 135 |
Ending balance: collectively evaluated for impairment | 6,989 |  |  |  | 6,866 |  |  |  | 6,989 | 6,866 |
Ending balance: loans acquired with deteriorated credit quality |  |  |  |  | 1 |  |  |  |  | 1 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 823,024 |  |  |  | 758,094 |  |  |  | 823,024 | 758,094 |
Ending balance: individually evaluated for impairment | 1,745 |  |  |  | 1,852 |  |  |  | 1,745 | 1,852 |
Ending balance: collectively evaluated for impairment | 821,279 |  |  |  | 756,242 |  |  |  | 821,279 | 756,242 |
Agricultural Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 241 |  |  |  | 211 | 241 | 211 |
Provision (Credit) |  |  |  |  |  |  |  |  | 3 | 30 |
Ending Balance | 244 |  |  |  | 241 |  |  |  | 244 | 241 | 211
Ending balance: collectively evaluated for impairment | 244 |  |  |  | 241 |  |  |  | 244 | 241 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 64,044 |  |  |  | 62,336 |  |  |  | 64,044 | 62,336 |
Ending balance: individually evaluated for impairment | 101 |  |  |  | 132 |  |  |  | 101 | 132 |
Ending balance: collectively evaluated for impairment | 63,943 |  |  |  | 62,204 |  |  |  | 63,943 | 62,204 |
Agricultural [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 616 |  |  |  | 582 | 616 | 582 |
Charge Offs |  |  |  |  |  |  |  |  |  | (21) |
Recoveries |  |  |  |  |  |  |  |  | 8 | 10 |
Provision (Credit) |  |  |  |  |  |  |  |  | 43 | 45 |
Ending Balance | 667 |  |  |  | 616 |  |  |  | 667 | 616 | 582
Ending balance: collectively evaluated for impairment | 667 |  |  |  | 616 |  |  |  | 667 | 616 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 95,238 |  |  |  | 84,692 |  |  |  | 95,238 | 84,692 |
Ending balance: collectively evaluated for impairment | 95,238 |  |  |  | 84,692 |  |  |  | 95,238 | 84,692 |
Commercial And Industrial and Industrial Development Bonds [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 1,318 |  |  |  | 1,229 | 1,318 | 1,229 |
Charge Offs |  |  |  |  |  |  |  |  |  | (20) |
Recoveries |  |  |  |  |  |  |  |  | 12 | 11 |
Provision (Credit) |  |  |  |  |  |  |  |  | 216 | 98 |
Ending Balance | 1,546 |  |  |  | 1,318 |  |  |  | 1,546 | 1,318 | 1,229
Ending balance: individually evaluated for impairment | 39 |  |  |  | 35 |  |  |  | 39 | 35 |
Ending balance: collectively evaluated for impairment | 1,507 |  |  |  | 1,283 |  |  |  | 1,507 | 1,283 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 132,787 |  |  |  | 115,093 |  |  |  | 132,787 | 115,093 |
Ending balance: individually evaluated for impairment | 444 |  |  |  | 116 |  |  |  | 444 | 116 |
Ending balance: collectively evaluated for impairment | 132,343 |  |  |  | 114,977 |  |  |  | 132,343 | 114,977 |
Unfunded Loan Commitment & Letters of Credit [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 217 |  |  |  | 208 | 217 | 208 |
Other Non-interest expense related to unfunded |  |  |  |  |  |  |  |  | 10 | 9 |
Ending Balance | 227 |  |  |  | 217 |  |  |  | 227 | 217 | 208
Ending balance: collectively evaluated for impairment | 227 |  |  |  | 217 |  |  |  | 227 | 217 |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |  |  |  |  |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance: loans acquired with deteriorated credit quality | 122 |  |  |  | 200 |  |  |  | 122 | 200 |
Consumer Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 316 |  |  |  | 338 | 316 | 338 |
Charge Offs |  |  |  |  |  |  |  |  | (4) | (106) |
Recoveries |  |  |  |  |  |  |  |  | 13 | 28 |
Provision (Credit) |  |  |  |  |  |  |  |  | 18 | 56 |
Ending Balance | 343 |  |  |  | 316 |  |  |  | 343 | 316 | 338
Ending balance: individually evaluated for impairment | 21 |  |  |  | 34 |  |  |  | 21 | 34 |
Ending balance: collectively evaluated for impairment | 322 |  |  |  | 282 |  |  |  | 322 | 282 |
Ending balance: loans acquired with deteriorated credit quality |  |  |  |  | 1 |  |  |  |  | 1 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 83,200 |  |  |  | 85,873 |  |  |  | 83,200 | 85,873 |
Ending balance: individually evaluated for impairment | 575 |  |  |  | 1,103 |  |  |  | 575 | 1,103 |
Ending balance: collectively evaluated for impairment | 82,625 |  |  |  | 84,770 |  |  |  | 82,625 | 84,770 |
Consumer Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |  |  |  |  |  |  |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance: loans acquired with deteriorated credit quality | 122 |  |  |  | 200 |  |  |  | 122 | 200 |
Commercial Real Estate [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 3,250 |  |  |  | 2,516 | 3,250 | 2,516 |
Charge Offs |  |  |  |  |  |  |  |  | (21) | (93) |
Recoveries |  |  |  |  |  |  |  |  | 15 | 20 |
Provision (Credit) |  |  |  |  |  |  |  |  | (95) | 807 |
Ending Balance | 3,149 |  |  |  | 3,250 |  |  |  | 3,149 | 3,250 | 2,516
Ending balance: individually evaluated for impairment | 46 |  |  |  | 66 |  |  |  | 46 | 66 |
Ending balance: collectively evaluated for impairment | 3,103 |  |  |  | 3,184 |  |  |  | 3,103 | 3,184 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 409,953 |  |  |  | 376,887 |  |  |  | 409,953 | 376,887 |
Ending balance: individually evaluated for impairment | 625 |  |  |  | 501 |  |  |  | 625 | 501 |
Ending balance: collectively evaluated for impairment | 409,328 |  |  |  | 376,386 |  |  |  | 409,328 | 376,386 |
Consumer [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | 394 |  |  |  | 337 | 394 | 337 |
Charge Offs |  |  |  |  |  |  |  |  | (263) | (310) |
Recoveries |  |  |  |  |  |  |  |  | 102 | 87 |
Provision (Credit) |  |  |  |  |  |  |  |  | 208 | 280 |
Ending Balance | 441 |  |  |  | 394 |  |  |  | 441 | 394 | 337
Ending balance: collectively evaluated for impairment | 441 |  |  |  | 394 |  |  |  | 441 | 394 |
FINANCING RECEIVABLES: |  |  |  |  |  |  |  |  |  |  |
Ending balance | 37,802 |  |  |  | 33,213 |  |  |  | 37,802 | 33,213 |
Ending balance: collectively evaluated for impairment | 37,802 |  |  |  | 33,213 |  |  |  | 37,802 | 33,213 |
Unallocated [Member] |  |  |  |  |  |  |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 649 |  |  |  | $ 844 | 649 | 844 |
Provision (Credit) |  |  |  |  |  |  |  |  | (171) | (195) |
Ending Balance | 478 |  |  |  | 649 |  |  |  | 478 | 649 | $ 844
Ending balance: collectively evaluated for impairment | $ 478 |  |  |  | $ 649 |  |  |  | $ 478 | $ 649 |

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- Definition Financing receivable allowance for credit losses acquired with deteriorated credit quality ending period. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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