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Loans and Allowance - Impaired Financing Receivables (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment with specific reserves | $ 1,671 | $ 1,750
Unpaid Principal Balance with specific reserves | 1,699 | 1,779
Interest Income Recognized with specific reserves | 5 | 66
Specific Reserve with specific reserves | 782 | 530
Recorded Investment | 1,740 | 1,845
Recorded Investment with no specific reserve | 2,643 | 3,267
Unpaid Principal Balance with no specific reserve | 3,411 | 4,159
Interest Income Recognized with no specific reserve | 50 | 80
Average Recorded Investment with no specific reserve | 3,528 | 4,131
Consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment with specific reserves | 160 | 176
Unpaid Principal Balance with specific reserves | 160 | 176
Interest Income Recognized with specific reserves | 5 |
Specific Reserve with specific reserves | 52 | 61
Recorded Investment | 205 | 217
Recorded Investment with no specific reserve | 88 | 193
Unpaid Principal Balance with no specific reserve | 88 | 193
Residential real estate |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment with specific reserves | 1,294 | 1,345
Unpaid Principal Balance with specific reserves | 1,322 | 1,374
Interest Income Recognized with specific reserves |  | 58
Specific Reserve with specific reserves | 513 | 240
Recorded Investment | 1,312 | 1,393
Recorded Investment with no specific reserve | 49 | 226
Unpaid Principal Balance with no specific reserve | 49 | 226
Average Recorded Investment with no specific reserve |  | 122
Commercial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment with specific reserves | 217 | 229
Unpaid Principal Balance with specific reserves | 217 | 229
Interest Income Recognized with specific reserves |  | 8
Specific Reserve with specific reserves | 217 | 229
Recorded Investment | 223 | 235
Recorded Investment with no specific reserve | 992 | 1,267
Unpaid Principal Balance with no specific reserve | 1,760 | 2,007
Interest Income Recognized with no specific reserve | 11 | 10
Average Recorded Investment with no specific reserve | 1,572 | 2,245
Commercial |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment with no specific reserve | 1,194 | 1,579
Unpaid Principal Balance with no specific reserve | 1,194 | 1,731
Interest Income Recognized with no specific reserve | 39 | 70
Average Recorded Investment with no specific reserve | 1,632 | 1,762
Home Equity Portfolio Segment |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment with no specific reserve | 318 |
Unpaid Principal Balance with no specific reserve | 318 |
Average Recorded Investment with no specific reserve | 322 |
Installment |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment with no specific reserve | 2 | 2
Unpaid Principal Balance with no specific reserve | 2 | 2
Average Recorded Investment with no specific reserve | $ 2 | $ 2

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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 average investment of impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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