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Loans and Allowance for Credit Losses - Changes in Allowance for Credit Losses (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) quarter | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Number of rolling quarters used in analysis | quarter | 20 |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for credit losses, beginning balance | $ 9,326 | $ 9,610 | $ 8,308
Provision charged to operations | (1,150) | (5,850) | 600
Losses charged to allowance | (464) | (883) | (961)
Recoveries | 1,066 | 6,449 | 1,663
Allowance for credit losses, ending balance | 8,778 | 9,326 | 9,610
Ending balance: individually evaluated for impairment | 36 | 307 |
Ending balance: collectively evaluated for impairment | 8,742 | 9,019 |
Commercial |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for credit losses, beginning balance | 2,180 | 3,562 | 3,130
Provision charged to operations | (762) | (6,048) | 190
Losses charged to allowance | (207) | (621) | (802)
Recoveries | 860 | 5,287 | 1,044
Allowance for credit losses, ending balance | 2,071 | 2,180 | 3,562
Ending balance: individually evaluated for impairment | 1 | 3 |
Ending balance: collectively evaluated for impairment | 2,070 | 2,177 |
Real Estate |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for credit losses, beginning balance | 6,200 | 5,204 | 4,058
Provision charged to operations | (449) | 11 | 1,114
Losses charged to allowance | (22) | 0 | 0
Recoveries | 66 | 985 | 32
Allowance for credit losses, ending balance | 5,795 | 6,200 | 5,204
Ending balance: individually evaluated for impairment | 1 | 241 |
Ending balance: collectively evaluated for impairment | 5,794 | 5,959 |
Consumer |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for credit losses, beginning balance | 852 | 734 | 1,078
Provision charged to operations | 68 | 203 | (772)
Losses charged to allowance | (235) | (262) | (159)
Recoveries | 140 | 177 | 587
Allowance for credit losses, ending balance | 825 | 852 | 734
Ending balance: individually evaluated for impairment | 34 | 63 |
Ending balance: collectively evaluated for impairment | 791 | 789 |
Unallocated |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for credit losses, beginning balance | 94 | 110 | 42
Provision charged to operations | (7) | (16) | 68
Losses charged to allowance | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for credit losses, ending balance | 87 | 94 | $ 110
Ending balance: individually evaluated for impairment | 0 | 0 |
Ending balance: collectively evaluated for impairment | $ 87 | $ 94 |

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- Definition Financing Receivable, Allowance for Credit Losses, Methodology Change, Number of Rolling Quarters Used in Analysis + References No definition available. + Details
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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 The valuation allowance for financing receivables that are expected to be uncollectible that were collectively 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 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 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 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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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + 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)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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