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Loans and Allowance - Total Allowance by Loan Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | $ 2,484 |  |  | $ 3,150 | $ 2,484 | $ 3,150
Charged off |  |  |  |  |  |  |  | (566) | (1,912)
Recoveries |  |  |  |  |  |  |  | 335 | 378
Provision for credit losses | $ 93 | $ 78 | $ (30) | 195 | $ 635 | $ 116 | 117 | 336 | 868
Balance, end of year | 2,589 |  |  |  | 2,484 |  |  | 2,589 | 2,484
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 782 |  |  |  | 530 |  |  | 782 | 530
Individually evaluated for impairment, Related loan balance | 3,898 |  |  |  | 4,675 |  |  | 3,898 | 4,675
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 1,807 |  |  |  | 1,954 |  |  | 1,807 | 1,954
Collectively evaluated for impairment, Related loan balance | 267,714 |  |  |  | 260,383 |  |  | 267,714 | 260,383
Consumer |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 182 |  |  | 227 | 182 | 227
Charged off |  |  |  |  |  |  |  | (96) | (18)
Recoveries |  |  |  |  |  |  |  | 8 | 17
Provision for credit losses |  |  |  |  |  |  |  | 120 | (44)
Balance, end of year | 214 |  |  |  | 182 |  |  | 214 | 182
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 52 |  |  |  | 61 |  |  | 52 | 61
Individually evaluated for impairment, Related loan balance | 160 |  |  |  | 258 |  |  | 160 | 258
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 162 |  |  |  | 121 |  |  | 162 | 121
Collectively evaluated for impairment, Related loan balance | 15,952 |  |  |  | 14,481 |  |  | 15,952 | 14,481
Residential Real estate |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 1,042 |  |  | 1,584 | 1,042 | 1,584
Charged off |  |  |  |  |  |  |  | (3) | (853)
Recoveries |  |  |  |  |  |  |  | 27 | 34
Provision for credit losses |  |  |  |  |  |  |  | (5) | 277
Balance, end of year | 1,061 |  |  |  | 1,042 |  |  | 1,061 | 1,042
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 513 |  |  |  | 240 |  |  | 513 | 240
Individually evaluated for impairment, Related loan balance | 2,345 |  |  |  | 2,775 |  |  | 2,345 | 2,775
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 548 |  |  |  | 802 |  |  | 548 | 802
Collectively evaluated for impairment, Related loan balance | 79,580 |  |  |  | 90,693 |  |  | 79,580 | 90,693
Indirect |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 693 |  |  | 577 | 693 | 577
Charged off |  |  |  |  |  |  |  | (458) | (677)
Recoveries |  |  |  |  |  |  |  | 286 | 318
Provision for credit losses |  |  |  |  |  |  |  | 253 | 475
Balance, end of year | 774 |  |  |  | 693 |  |  | 774 | 693
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 774 |  |  |  | 693 |  |  | 774 | 693
Collectively evaluated for impairment, Related loan balance | 85,186 |  |  |  | 71,656 |  |  | 85,186 | 71,656
Commercial |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 284 |  |  | 305 | 284 | 305
Charged off |  |  |  |  |  |  |  | (9) |
Recoveries |  |  |  |  |  |  |  |  | 9
Provision for credit losses |  |  |  |  |  |  |  | (38) | (30)
Balance, end of year | 237 |  |  |  | 284 |  |  | 237 | 284
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 217 |  |  |  | 229 |  |  | 217 | 229
Individually evaluated for impairment, Related loan balance | 217 |  |  |  | 229 |  |  | 217 | 229
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 20 |  |  |  | 55 |  |  | 20 | 55
Collectively evaluated for impairment, Related loan balance | 11,040 |  |  |  | 12,122 |  |  | 11,040 | 12,122
Construction |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 10 |  |  | 19 | 10 | 19
Provision for credit losses |  |  |  |  |  |  |  | 2 | (9)
Balance, end of year | 12 |  |  |  | 10 |  |  | 12 | 10
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 12 |  |  |  | 10 |  |  | 12 | 10
Collectively evaluated for impairment, Related loan balance | 3,536 |  |  |  | 4,397 |  |  | 3,536 | 4,397
Commercial Real Estate |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 259 |  |  | 290 | 259 | 290
Charged off |  |  |  |  |  |  |  |  | (364)
Recoveries |  |  |  |  |  |  |  | 14 |
Provision for credit losses |  |  |  |  |  |  |  | 18 | 333
Balance, end of year | 291 |  |  |  | 259 |  |  | 291 | 259
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Related loan balance | 1,176 |  |  |  | 1,413 |  |  | 1,176 | 1,413
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 291 |  |  |  | 259 |  |  | 291 | 259
Collectively evaluated for impairment, Related loan balance | $ 72,420 |  |  |  | 67,034 |  |  | 72,420 | 67,034
Unallocated |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | $ 14 |  |  | $ 148 | 14 | 148
Provision for credit losses |  |  |  |  |  |  |  | $ (14) | (134)
Balance, end of year |  |  |  |  | 14 |  |  |  | 14
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance |  |  |  |  | $ 14 |  |  |  | $ 14

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