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Loans, Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | $ 11,941 | $ 9,979 | $ 11,190 | $ 8,886
Charge-offs | (48) | (56) | (225) | (240)
Recoveries | 15 | 24 | 118 | 61
Provision | 475 | 500 | 1,300 | 1,740
Balance at end of period | 12,383 | 10,447 | 12,383 | 10,447
Real Estate Loans [Member] | Residential [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 1,045 | 1,104 | 1,049 | 1,064
Charge-offs | (10) | (11) | (27) | (104)
Recoveries | 1 | 0 | 70 | 0
Provision | 16 | (13) | (40) | 120
Balance at end of period | 1,052 | 1,080 | 1,052 | 1,080
Real Estate Loans [Member] | Commercial [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 3,794 | 3,541 | 3,867 | 3,589
Charge-offs | (25) | 0 | (25) | (41)
Recoveries | 0 | 5 | 3 | 11
Provision | 156 | 36 | 80 | 23
Balance at end of period | 3,925 | 3,582 | 3,925 | 3,582
Real Estate Loans [Member] | Agricultural [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 3,673 | 2,452 | 3,143 | 1,494
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Provision | 256 | 242 | 786 | 1,200
Balance at end of period | 3,929 | 2,694 | 3,929 | 2,694
Real Estate Loans [Member] | Construction [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 44 | 45 | 23 | 47
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Provision | 5 | (14) | 26 | (16)
Balance at end of period | 49 | 31 | 49 | 31
Consumer [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 115 | 125 | 124 | 122
Charge-offs | (13) | (45) | (32) | (90)
Recoveries | 9 | 13 | 26 | 35
Provision | 12 | 44 | 5 | 70
Balance at end of period | 123 | 137 | 123 | 137
Other Commercial Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 1,266 | 1,131 | 1,272 | 1,327
Charge-offs | 0 | 0 | (91) | 0
Recoveries | 5 | 5 | 19 | 14
Provision | (52) | (24) | 19 | (229)
Balance at end of period | 1,219 | 1,112 | 1,219 | 1,112
Other Agricultural Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 589 | 431 | 492 | 312
Charge-offs | 0 | 0 | (50) | (5)
Recoveries | 0 | 1 | 0 | 1
Provision | 110 | 30 | 257 | 154
Balance at end of period | 699 | 462 | 699 | 462
State and Political Subdivision Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 767 | 838 | 816 | 833
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Provision | (16) | 36 | (65) | 41
Balance at end of period | 751 | 874 | 751 | 874
Unallocated [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |
Balance at beginning of period | 648 | 312 | 404 | 98
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Provision | (12) | 163 | 232 | 377
Balance at end of period | $ 636 | $ 475 | $ 636 | $ 475

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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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