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Loans, Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | $ 11,587 | $ 9,405 | $ 11,190 | $ 8,886
Charge-offs | (61) | (65) | (177) | (184)
Recoveries | 90 | 14 | 103 | 37
Provision | 325 | 625 | 825 | 1,240
Balance at end of period | 11,941 | 9,979 | 11,941 | 9,979
Real Estate Loans [Member] | Residential [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 1,077 | 1,042 | 1,049 | 1,064
Charge-offs | (2) | (48) | (17) | (93)
Recoveries | 69 | 0 | 69 | 0
Provision | (99) | 110 | (56) | 133
Balance at end of period | 1,045 | 1,104 | 1,045 | 1,104
Real Estate Loans [Member] | Commercial [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 4,006 | 3,665 | 3,867 | 3,589
Charge-offs | 0 | 0 | 0 | (41)
Recoveries | 3 | 2 | 3 | 6
Provision | (215) | (126) | (76) | (13)
Balance at end of period | 3,794 | 3,541 | 3,794 | 3,541
Real Estate Loans [Member] | Agricultural [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 3,340 | 1,952 | 3,143 | 1,494
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Provision | 333 | 500 | 530 | 958
Balance at end of period | 3,673 | 2,452 | 3,673 | 2,452
Real Estate Loans [Member] | Construction [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 39 | 46 | 23 | 47
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Provision | 5 | (1) | 21 | (2)
Balance at end of period | 44 | 45 | 44 | 45
Consumer [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 123 | 123 | 124 | 122
Charge-offs | (6) | (17) | (19) | (45)
Recoveries | 7 | 12 | 17 | 22
Provision | (9) | 7 | (7) | 26
Balance at end of period | 115 | 125 | 115 | 125
Other Commercial Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 1,273 | 1,215 | 1,272 | 1,327
Charge-offs | (46) | 0 | (91) | 0
Recoveries | 11 | 0 | 14 | 9
Provision | 28 | (84) | 71 | (205)
Balance at end of period | 1,266 | 1,131 | 1,266 | 1,131
Other Agricultural Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 532 | 306 | 492 | 312
Charge-offs | (7) | 0 | (50) | (5)
Recoveries | 0 | 0 | 0 | 0
Provision | 64 | 125 | 147 | 124
Balance at end of period | 589 | 431 | 589 | 431
State and Political Subdivision Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 789 | 824 | 816 | 833
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Provision | (22) | 14 | (49) | 5
Balance at end of period | 767 | 838 | 767 | 838
Unallocated [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 408 | 232 | 404 | 98
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Provision | 240 | 80 | 244 | 214
Balance at end of period | $ 648 | $ 312 | $ 648 | $ 312

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + 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)(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://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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