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Loans - Analysis of Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | $ 7,065 | $ 7,069 | $ 7,095 | $ 7,001 | $ 7,001
Charge Offs | (182) | (53) | (327) | (97) | (288)
Recoveries | 39 | 36 | 76 | 73 | 150
Provision (Credit) | 132 | 25 | 172 | 98 | 222
Other Non-interest expense related to unfunded | 50 |  | 88 | 2 |
Ending Balance | 7,104 | 7,077 | 7,104 | 7,077 | 7,095
Ending balance: individually evaluated for impairment | 132 | 115 | 132 | 115 |
Ending balance: collectively evaluated for impairment | 6,972 | 6,962 | 6,972 | 6,962 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 831,015 | 790,838 | 831,015 | 790,838 | 823,024
Ending balance: individually evaluated for impairment | 1,452 | 1,715 | 1,452 | 1,715 |
Ending balance: collectively evaluated for impairment | 829,563 | 789,123 | 829,563 | 789,123 |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance: loans acquired with deteriorated credit quality | 119 | 196 | 119 | 196 |
Agricultural Real Estate [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 263 | 244 | 244 | 241 | 241
Provision (Credit) | (8) | 9 | 11 | 12 |
Ending Balance | 255 | 253 | 255 | 253 | 244
Ending balance: collectively evaluated for impairment | 255 | 253 | 255 | 253 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 69,676 | 64,003 | 69,676 | 64,003 | 64,044
Ending balance: individually evaluated for impairment |  | 101 |  | 101 |
Ending balance: collectively evaluated for impairment | 69,676 | 63,902 | 69,676 | 63,902 |
Agricultural [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 706 | 634 | 667 | 616 | 616
Recoveries | 3 | 1 | 6 | 2 |
Provision (Credit) | 42 | (39) | 78 | (22) |
Ending Balance | 751 | 596 | 751 | 596 | 667
Ending balance: collectively evaluated for impairment | 751 | 596 | 751 | 596 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 104,980 | 83,771 | 104,980 | 83,771 | 95,238
Ending balance: collectively evaluated for impairment | 104,980 | 83,771 | 104,980 | 83,771 |
Commercial And Industrial and Industrial Development Bonds [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 1,443 | 1,299 | 1,546 | 1,318 | 1,318
Charge Offs | (100) |  | (100) |  |
Recoveries | 3 | 3 | 6 | 6 |
Provision (Credit) | 74 | 50 | (32) | 28 |
Ending Balance | 1,420 | 1,352 | 1,420 | 1,352 | 1,546
Ending balance: individually evaluated for impairment | 86 | 33 | 86 | 33 |
Ending balance: collectively evaluated for impairment | 1,334 | 1,319 | 1,334 | 1,319 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 122,510 | 129,675 | 122,510 | 129,675 | 132,787
Ending balance: individually evaluated for impairment | 394 | 114 | 394 | 114 |
Ending balance: collectively evaluated for impairment | 122,116 | 129,561 | 122,116 | 129,561 |
Unfunded Loan Commitment & Letters of Credit [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 265 | 219 | 227 | 217 | 217
Other Non-interest expense related to unfunded | 50 |  | 88 | 2 |
Ending Balance | 315 | 219 | 315 | 219 | 227
Ending balance: collectively evaluated for impairment | 315 | 219 | 315 | 219 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
Consumer Real Estate [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 254 | 277 | 343 | 316 | 316
Charge Offs |  |  | (34) |  |
Recoveries |  | 2 |  | 13 |
Provision (Credit) | (3) | (29) | (58) | (79) |
Ending Balance | 251 | 250 | 251 | 250 | 343
Ending balance: individually evaluated for impairment | 46 | 25 | 46 | 25 |
Ending balance: collectively evaluated for impairment | 205 | 225 | 205 | 225 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 82,368 | 83,903 | 82,368 | 83,903 | 83,200
Ending balance: individually evaluated for impairment | 860 | 1,008 | 860 | 1,008 |
Ending balance: collectively evaluated for impairment | 81,508 | 82,895 | 81,508 | 82,895 |
Consumer Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance: loans acquired with deteriorated credit quality | 119 | 196 | 119 | 196 |
Commercial Real Estate [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 3,674 | 3,008 | 3,149 | 3,250 | 3,250
Charge Offs | (1) |  | (16) |  |
Recoveries | 2 | 5 | 4 | 7 |
Provision (Credit) | (415) | 63 | 123 | (181) |
Ending Balance | 3,260 | 3,076 | 3,260 | 3,076 | 3,149
Ending balance: individually evaluated for impairment |  | 57 |  | 57 |
Ending balance: collectively evaluated for impairment | 3,260 | 3,019 | 3,260 | 3,019 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 410,886 | 394,051 | 410,886 | 394,051 | 409,953
Ending balance: individually evaluated for impairment | 198 | 492 | 198 | 492 |
Ending balance: collectively evaluated for impairment | 410,688 | 393,559 | 410,688 | 393,559 |
Consumer [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 431 | 397 | 441 | 394 | 394
Charge Offs | (81) | (53) | (177) | (97) |
Recoveries | 31 | 25 | 60 | 45 |
Provision (Credit) | 78 | 38 | 135 | 65 |
Ending Balance | 459 | 407 | 459 | 407 | 441
Ending balance: collectively evaluated for impairment | 459 | 407 | 459 | 407 |
Ending balance: loans acquired with deteriorated credit quality | 0 | 0 | 0 | 0 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 40,595 | 35,435 | 40,595 | 35,435 | 37,802
Ending balance: collectively evaluated for impairment | 40,595 | 35,435 | 40,595 | 35,435 |
Unallocated [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 29 | 991 | 478 | 649 | 649
Provision (Credit) | 364 | (67) | (85) | 275 |
Ending Balance | 393 | 924 | 393 | 924 | $ 478
Ending balance: collectively evaluated for impairment | 393 | 924 | 393 | 924 |
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 valuation allowance for financing receivables that are expected to be uncollectible that were individually 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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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + 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://fasb.org/us-gaap/role/ref/legacyRef -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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