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Loans, Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | $ 9,979 | $ 7,359 | $ 8,886 | $ 7,106
Charge-offs | (56) | (173) | (240) | (272)
Recoveries | 24 | 508 | 61 | 590
Provision | 500 | 500 | 1,740 | 770
Balance at end of period | 10,447 | 8,194 | 10,447 | 8,194
Real Estate Loans [Member] | Residential [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 1,104 | 990 | 1,064 | 905
Charge-offs | (11) | (9) | (104) | (52)
Recoveries | 0 | 0 | 0 | 0
Provision | (13) | 32 | 120 | 160
Balance at end of period | 1,080 | 1,013 | 1,080 | 1,013
Real Estate Loans [Member] | Commercial [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 3,541 | 3,338 | 3,589 | 3,376
Charge-offs | 0 | (100) | (41) | (100)
Recoveries | 5 | 467 | 11 | 475
Provision | 36 | (90) | 23 | (136)
Balance at end of period | 3,582 | 3,615 | 3,582 | 3,615
Real Estate Loans [Member] | Agricultural [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 2,452 | 581 | 1,494 | 409
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Provision | 242 | 410 | 1,200 | 582
Balance at end of period | 2,694 | 991 | 2,694 | 991
Real Estate Loans [Member] | Construction [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 45 | 18 | 47 | 24
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Provision | (14) | 16 | (16) | 10
Balance at end of period | 31 | 34 | 31 | 34
Consumer [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 125 | 104 | 122 | 102
Charge-offs | (45) | (27) | (90) | (65)
Recoveries | 13 | 16 | 35 | 84
Provision | 44 | 16 | 70 | (12)
Balance at end of period | 137 | 109 | 137 | 109
Other Commercial Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 1,131 | 1,316 | 1,327 | 1,183
Charge-offs | 0 | (37) | 0 | (55)
Recoveries | 5 | 25 | 14 | 31
Provision | (24) | 39 | (229) | 184
Balance at end of period | 1,112 | 1,343 | 1,112 | 1,343
Other Agricultural Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 431 | 248 | 312 | 122
Charge-offs | 0 | 0 | (5) | 0
Recoveries | 1 | 0 | 1 | 0
Provision | 30 | 51 | 154 | 177
Balance at end of period | 462 | 299 | 462 | 299
State and Political Subdivision Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 838 | 764 | 833 | 593
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Provision | 36 | 7 | 41 | 178
Balance at end of period | 874 | 771 | 874 | 771
Unallocated [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 312 | 0 | 98 | 392
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Provision | 163 | 19 | 377 | (373)
Balance at end of period | $ 475 | $ 19 | $ 475 | $ 19

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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 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 A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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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