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LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES, Allowance for Loan Losses by Portfolio Segment (Details) - 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
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 8,886 |  |  |  | $ 7,106 | $ 8,886 | $ 7,106 | $ 6,815
Charge-offs |  |  |  |  |  |  |  |  | (313) | (340) | (238)
Recoveries |  |  |  |  |  |  |  |  | 77 | 600 | 49
Provision (benefit) | $ 800 | $ 500 | $ 625 | 615 | $ 750 | $ 500 | $ 135 | 135 | 2,540 | 1,520 | 480
Balance at end of period | 11,190 |  |  |  | 8,886 |  |  |  | 11,190 | 8,886 | 7,106
Individually evaluated for impairment | 410 |  |  |  | 487 |  |  |  | 410 | 487 | 355
Collectively evaluated for impairment | 10,780 |  |  |  | 8,399 |  |  |  | 10,780 | 8,399 | 6,751
Real Estate Loans [Member] | Residential [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 1,064 |  |  |  | 905 | 1,064 | 905 | 878
Charge-offs |  |  |  |  |  |  |  |  | (107) | (85) | (66)
Recoveries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Provision (benefit) |  |  |  |  |  |  |  |  | 92 | 244 | 93
Balance at end of period | 1,049 |  |  |  | 1,064 |  |  |  | 1,049 | 1,064 | 905
Individually evaluated for impairment | 56 |  |  |  | 32 |  |  |  | 56 | 32 | 37
Collectively evaluated for impairment | 993 |  |  |  | 1,032 |  |  |  | 993 | 1,032 | 868
Real Estate Loans [Member] | Commercial [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 3,589 |  |  |  | 3,376 | 3,589 | 3,376 | 3,419
Charge-offs |  |  |  |  |  |  |  |  | (41) | (100) | (84)
Recoveries |  |  |  |  |  |  |  |  | 11 | 479 | 14
Provision (benefit) |  |  |  |  |  |  |  |  | 308 | (166) | 27
Balance at end of period | 3,867 |  |  |  | 3,589 |  |  |  | 3,867 | 3,589 | 3,376
Individually evaluated for impairment | 94 |  |  |  | 45 |  |  |  | 94 | 45 | 62
Collectively evaluated for impairment | 3,773 |  |  |  | 3,544 |  |  |  | 3,773 | 3,544 | 3,314
Real Estate Loans [Member] | Agricultural [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 1,494 |  |  |  | 409 | 1,494 | 409 | 451
Charge-offs |  |  |  |  |  |  |  |  | (30) | 0 | 0
Recoveries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Provision (benefit) |  |  |  |  |  |  |  |  | 1,679 | 1,085 | (42)
Balance at end of period | 3,143 |  |  |  | 1,494 |  |  |  | 3,143 | 1,494 | 409
Individually evaluated for impairment | 3 |  |  |  | 54 |  |  |  | 3 | 54 |
Collectively evaluated for impairment | 3,140 |  |  |  | 1,440 |  |  |  | 3,140 | 1,440 | 409
Real Estate Loans [Member] | Construction [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 47 |  |  |  | 24 | 47 | 24 | 26
Charge-offs |  |  |  |  |  |  |  |  | 0 | 0 | 0
Recoveries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Provision (benefit) |  |  |  |  |  |  |  |  | (24) | 23 | (2)
Balance at end of period | 23 |  |  |  | 47 |  |  |  | 23 | 47 | 24
Individually evaluated for impairment | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Collectively evaluated for impairment | 23 |  |  |  | 47 |  |  |  | 23 | 47 | 24
Consumer [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 122 |  |  |  | 102 | 122 | 102 | 84
Charge-offs |  |  |  |  |  |  |  |  | (130) | (100) | (47)
Recoveries |  |  |  |  |  |  |  |  | 49 | 88 | 33
Provision (benefit) |  |  |  |  |  |  |  |  | 83 | 32 | 32
Balance at end of period | 124 |  |  |  | 122 |  |  |  | 124 | 122 | 102
Individually evaluated for impairment | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Collectively evaluated for impairment | 124 |  |  |  | 122 |  |  |  | 124 | 122 | 102
Other Commercial Loans [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 1,327 |  |  |  | 1,183 | 1,327 | 1,183 | 1,007
Charge-offs |  |  |  |  |  |  |  |  | 0 | (55) | (41)
Recoveries |  |  |  |  |  |  |  |  | 16 | 33 | 2
Provision (benefit) |  |  |  |  |  |  |  |  | (71) | 166 | 215
Balance at end of period | 1,272 |  |  |  | 1,327 |  |  |  | 1,272 | 1,327 | 1,183
Individually evaluated for impairment | 231 |  |  |  | 326 |  |  |  | 231 | 326 | 256
Collectively evaluated for impairment | 1,041 |  |  |  | 1,001 |  |  |  | 1,041 | 1,001 | 927
Other Agricultural Loans [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 312 |  |  |  | 122 | 312 | 122 | 217
Charge-offs |  |  |  |  |  |  |  |  | (5) | 0 | 0
Recoveries |  |  |  |  |  |  |  |  | 1 | 0 | 0
Provision (benefit) |  |  |  |  |  |  |  |  | 184 | 190 | (95)
Balance at end of period | 492 |  |  |  | 312 |  |  |  | 492 | 312 | 122
Individually evaluated for impairment | 26 |  |  |  | 30 |  |  |  | 26 | 30 |
Collectively evaluated for impairment | 466 |  |  |  | 282 |  |  |  | 466 | 282 | 122
State and Political Subdivision Loans [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | 833 |  |  |  | 593 | 833 | 593 | 545
Charge-offs |  |  |  |  |  |  |  |  | 0 | 0 | 0
Recoveries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Provision (benefit) |  |  |  |  |  |  |  |  | (17) | 240 | 48
Balance at end of period | 816 |  |  |  | 833 |  |  |  | 816 | 833 | 593
Individually evaluated for impairment | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Collectively evaluated for impairment | 816 |  |  |  | 833 |  |  |  | 816 | 833 | 593
Unallocated [Member] |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  |  | $ 98 |  |  |  | $ 392 | 98 | 392 | 188
Charge-offs |  |  |  |  |  |  |  |  | 0 | 0 | 0
Recoveries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Provision (benefit) |  |  |  |  |  |  |  |  | 306 | (294) | 204
Balance at end of period | 404 |  |  |  | 98 |  |  |  | 404 | 98 | 392
Individually evaluated for impairment | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Collectively evaluated for impairment | $ 404 |  |  |  | $ 98 |  |  |  | $ 404 | $ 98 | $ 392

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + 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)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + 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 Amount of recovery of financing receivables doubtful of collection that were previously charged off. + 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 direct write-downs of financing receivables charged against the allowance. + 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 + Details
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