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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | $ 7,077 | $ 6,712 | $ 7,001 | $ 6,265 | $ 6,265
Charge Offs | (111) | (218) | (208) | (476) | (550)
Recoveries | 24 | 29 | 97 | 107 | 156
Provision (Credit) | 99 | 308 | 197 | 924 | 1,121
Other Non-interest expense related to unfunded | 9 | 8 | 11 | 19 |
Ending Balance | 7,098 | 6,839 | 7,098 | 6,839 | 7,001
Ending balance: individually evaluated for impairment | 123 | 125 | 123 | 125 |
Ending balance: collectively evaluated for impairment | 6,975 | 6,714 | 6,975 | 6,714 |
Ending balance: loans acquired with deteriorated credit quality |  | 1 |  | 1 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 795,205 | 737,057 | 795,205 | 737,057 | 758,094
Ending balance: individually evaluated for impairment | 1,979 | 1,406 | 1,979 | 1,406 |
Ending balance: collectively evaluated for impairment | 793,226 | 735,651 | 793,226 | 735,651 |
Agricultural Real Estate [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 253 | 229 | 241 | 211 | 211
Provision (Credit) | (5) | 5 | 7 | 23 |
Ending Balance | 248 | 234 | 248 | 234 | 241
Ending balance: collectively evaluated for impairment | 248 | 234 | 248 | 234 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 63,571 | 59,458 | 63,571 | 59,458 | 62,336
Ending balance: individually evaluated for impairment | 205 | 132 | 205 | 132 |
Ending balance: collectively evaluated for impairment | 63,366 | 59,326 | 63,366 | 59,326 |
Agricultural [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 596 | 591 | 616 | 582 | 582
Charge Offs |  | (3) |  | (21) |
Recoveries |  | 4 | 2 | 9 |
Provision (Credit) | 17 | (12) | (5) | 10 |
Ending Balance | 613 | 580 | 613 | 580 | 616
Ending balance: collectively evaluated for impairment | 613 | 580 | 613 | 580 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 87,239 | 79,332 | 87,239 | 79,332 | 84,692
Ending balance: individually evaluated for impairment | 161 |  | 161 |  |
Ending balance: collectively evaluated for impairment | 87,078 | 79,332 | 87,078 | 79,332 |
Commercial And Industrial and Industrial Development Bonds [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 1,352 | 1,215 | 1,318 | 1,229 | 1,229
Charge Offs |  |  |  | (20) |
Recoveries | 2 | 3 | 8 | 8 |
Provision (Credit) | 38 | (23) | 66 | (22) |
Ending Balance | 1,392 | 1,195 | 1,392 | 1,195 | 1,318
Ending balance: individually evaluated for impairment | 31 | 22 | 31 | 22 |
Ending balance: collectively evaluated for impairment | 1,361 | 1,173 | 1,361 | 1,173 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 130,720 | 111,953 | 130,720 | 111,953 | 115,093
Ending balance: individually evaluated for impairment | 113 | 118 | 113 | 118 |
Ending balance: collectively evaluated for impairment | 130,607 | 111,835 | 130,607 | 111,835 |
Unfunded Loan Commitment & Letters of Credit [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 219 | 219 | 217 | 208 | 208
Other Non-interest expense related to unfunded | 9 | 8 | 11 | 19 |
Ending Balance | 228 | 227 | 228 | 227 | 217
Ending balance: collectively evaluated for impairment | 228 | 227 | 228 | 227 |
Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance: loans acquired with deteriorated credit quality | 194 | 265 | 194 | 265 |
Consumer Real Estate [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 250 | 413 | 316 | 338 | 338
Charge Offs |  | (42) |  | (106) |
Recoveries |  | 1 | 13 | 23 |
Provision (Credit) | 26 | (86) | (53) | 31 |
Ending Balance | 276 | 286 | 276 | 286 | 316
Ending balance: individually evaluated for impairment | 25 | 35 | 25 | 35 |
Ending balance: collectively evaluated for impairment | 251 | 251 | 251 | 251 |
Ending balance: loans acquired with deteriorated credit quality |  | 1 |  | 1 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 83,875 | 85,977 | 83,875 | 85,977 | 85,873
Ending balance: individually evaluated for impairment | 1,012 | 712 | 1,012 | 712 |
Ending balance: collectively evaluated for impairment | 82,863 | 85,265 | 82,863 | 85,265 |
Consumer Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |  |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance: loans acquired with deteriorated credit quality | 194 | 265 | 194 | 265 |
Commercial Real Estate [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 3,076 | 2,717 | 3,250 | 2,516 | 2,516
Charge Offs | (19) | (90) | (19) | (93) |
Recoveries | 4 | 2 | 11 | 7 |
Provision (Credit) | 56 | 376 | (125) | 575 |
Ending Balance | 3,117 | 3,005 | 3,117 | 3,005 | 3,250
Ending balance: individually evaluated for impairment | 67 | 68 | 67 | 68 |
Ending balance: collectively evaluated for impairment | 3,050 | 2,937 | 3,050 | 2,937 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 393,913 | 369,721 | 393,913 | 369,721 | 376,887
Ending balance: individually evaluated for impairment | 488 | 444 | 488 | 444 |
Ending balance: collectively evaluated for impairment | 393,425 | 369,277 | 393,425 | 369,277 |
Consumer [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 407 | 365 | 394 | 337 | 337
Charge Offs | (92) | (83) | (189) | (236) |
Recoveries | 18 | 19 | 63 | 60 |
Provision (Credit) | 90 | 59 | 155 | 199 |
Ending Balance | 423 | 360 | 423 | 360 | 394
Ending balance: collectively evaluated for impairment | 423 | 360 | 423 | 360 |
FINANCING RECEIVABLES: |  |  |  |  |
Ending balance | 35,887 | 30,616 | 35,887 | 30,616 | 33,213
Ending balance: collectively evaluated for impairment | 35,887 | 30,616 | 35,887 | 30,616 |
Unallocated [Member] |  |  |  |  |
ALLOWANCE FOR CREDIT LOSSES: |  |  |  |  |
Beginning balance | 924 | 963 | 649 | 844 | 844
Provision (Credit) | (123) | (11) | 152 | 108 |
Ending Balance | 801 | 952 | 801 | 952 | $ 649
Ending balance: collectively evaluated for impairment | $ 801 | $ 952 | $ 801 | $ 952 |

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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 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 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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://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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