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Loans and Allowance for Loan Losses (Details 8) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment | $ 13,019 | $ 11,556 | $ 14,548
Recognized interest income | 637 | 536 | 416
Commercial [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment | 9,222 | 9,242 | 12,976
Recognized interest income | 465 | 447 | 356
Commercial [Member] | Owner occupied RE [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment | 2,255 | 2,263 | 884
Recognized interest income | 104 | 112 | 6
Commercial [Member] | Non-owner occupied RE [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment | 4,144 | 4,106 | 6,137
Recognized interest income | 199 | 200 | 128
Commercial [Member] | Business [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment | 2,823 | 2,873 | 4,067
Recognized interest income | 162 | 135 | 148
Commercial [Member] | Construction [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment |  |  | 1,888
Recognized interest income |  |  | 74
Consumer [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment | 3,797 | 2,314 | 1,572
Recognized interest income | 172 | 89 | 60
Consumer [Member] | Other [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment | 174 | 203 | 208
Recognized interest income | 6 | 6 | 7
Consumer [Member] | Real estate [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment | 2,047 | 1,854 | 1,112
Recognized interest income | 69 | 81 | 46
Consumer [Member] | Home equity [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment | 1,576 | 257 | 252
Recognized interest income | 97 | 2 | 7
Consumer [Member] | Construction [Member] |  |  |
Average recorded investment and interest income recognized on impaired loans |  |  |
Average recorded investment |  |  |
Recognized interest income |  |  |

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a 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 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: 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 + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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