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Loans and Allowance - Non-accrual loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable Nonaccrual Status [Roll Forward] |  |
Balance | $ 3,751 | $ 3,780
Transfer into non-accrual | 1,483 | 3,270
Transfer to REO |  | (240)
Loans paid down/payoffs | (947) | (1,145)
Loans brought to accrual status | (452) | (508)
Charged off | (565) | (1,406)
Balance | 3,270 | 3,751
Consumer |  |
Financing Receivable Nonaccrual Status [Roll Forward] |  |
Balance | 403 | 623
Transfer into non-accrual | 10 | 117
Loans paid down/payoffs | (130) | (64)
Loans brought to accrual status |  | (256)
Charged off | (98) | (17)
Balance | 185 | 403
Residential Real estate |  |
Financing Receivable Nonaccrual Status [Roll Forward] |  |
Balance | 2,508 | 2,508
Transfer into non-accrual | 329 | 1,415
Transfer to REO |  | (126)
Loans paid down/payoffs | (429) | (191)
Loans brought to accrual status | (281) | (252)
Charged off | (3) | (846)
Balance | 2,124 | 2,508
Indirect |  |
Financing Receivable Nonaccrual Status [Roll Forward] |  |
Balance | 193 | 349
Transfer into non-accrual | 686 | 898
Loans paid down/payoffs | (163) | (875)
Loans brought to accrual status | (171) |
Charged off | (457) | (179)
Balance | 88 | 193
Commercial |  |
Financing Receivable Nonaccrual Status [Roll Forward] |  |
Transfer into non-accrual | 56 |
Loans paid down/payoffs | (1) |
Charged off | (7) |
Balance | 48 |
Construction |  |
Financing Receivable Nonaccrual Status [Roll Forward] |  |
Transfer into non-accrual | 402 |
Loans paid down/payoffs | (84) |
Balance | 318 |
Commercial Real Estate |  |
Financing Receivable Nonaccrual Status [Roll Forward] |  |
Balance | 647 | 300
Transfer into non-accrual |  | 840
Transfer to REO |  | (114)
Loans paid down/payoffs | (140) | (15)
Charged off |  | (364)
Balance | $ 507 | $ 647

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- Definition Amount of nonaccrual direct write-downs of financing receivables charged against the allowance. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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- Definition Value transferred from mortgage loans to real estate owned (REO) in noncash transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 + Details
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