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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) quarter component | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) quarter component | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Number of primary components | component | 2 |  | 2 |  |
Lookback period used in reserve analysis | quarter | 20 |  | 20 |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Allowance for credit losses, beginning balance | $ 8,920 | $ 9,297 | $ 8,778 | $ 9,326 |
Provision charged to operations | 0 | (900) | 50 | (1,150) |
Losses charged to allowance | (23) | (22) | (175) | (232) |
Recoveries | 128 | 541 | 372 | 972 |
Allowance for credit losses, ending balance | 9,025 | 8,916 | 9,025 | 8,916 |
Ending balance: individually evaluated for impairment | 222 |  | 222 |  | $ 36
Ending balance: collectively evaluated for impairment | 8,803 |  | 8,803 |  | 8,742
Commercial |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Allowance for credit losses, beginning balance | 1,938 | 2,196 | 2,071 | 2,180 |
Provision charged to operations | (273) | (532) | (422) | (776) |
Losses charged to allowance | 0 | (4) | (87) | (48) |
Recoveries | 29 | 514 | 132 | 818 |
Allowance for credit losses, ending balance | 1,694 | 2,174 | 1,694 | 2,174 |
Ending balance: individually evaluated for impairment | 1 |  | 1 |  | 1
Ending balance: collectively evaluated for impairment | 1,693 |  | 1,693 |  | 2,070
Real Estate |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Allowance for credit losses, beginning balance | 6,155 | 5,931 | 5,795 | 6,200 |
Provision charged to operations | 203 | (251) | 481 | (554) |
Losses charged to allowance | 0 | 0 | 0 | (22) |
Recoveries | 20 | 5 | 102 | 61 |
Allowance for credit losses, ending balance | 6,378 | 5,685 | 6,378 | 5,685 |
Ending balance: individually evaluated for impairment | 163 |  | 163 |  | 1
Ending balance: collectively evaluated for impairment | 6,215 |  | 6,215 |  | 5,794
Consumer |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Allowance for credit losses, beginning balance | 793 | 793 | 825 | 852 |
Provision charged to operations | 16 | (35) | (10) | (21) |
Losses charged to allowance | (23) | (18) | (88) | (162) |
Recoveries | 79 | 22 | 138 | 93 |
Allowance for credit losses, ending balance | 865 | 762 | 865 | 762 |
Ending balance: individually evaluated for impairment | 58 |  | 58 |  | 34
Ending balance: collectively evaluated for impairment | 807 |  | 807 |  | 791
Unallocated |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |
Allowance for credit losses, beginning balance | 34 | 377 | 87 | 94 |
Provision charged to operations | 54 | (82) | 1 | 201 |
Losses charged to allowance | 0 | 0 | 0 | 0 |
Recoveries | 0 | 0 | 0 | 0 |
Allowance for credit losses, ending balance | 88 | $ 295 | 88 | $ 295 |
Ending balance: individually evaluated for impairment | 0 |  | 0 |  | 0
Ending balance: collectively evaluated for impairment | $ 88 |  | $ 88 |  | $ 87

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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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