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Loans and Allowance for Loan Losses - Total Allowance by Loan Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | $ 2,589 |  |  |  |  | $ 2,589 | $ 2,484
Charged off |  |  |  |  |  |  |  |  | (1,151) | (566)
Recoveries |  |  |  |  |  |  |  |  | 247 | 335
Provision for loan losses | $ 255 | $ 246 | $ (5) | 360 | $ 93 | $ 78 | $ (30) | $ 195 | 856 | 336
Balance, end of year | 2,541 |  |  |  | 2,484 |  |  |  | 2,541 | 2,589
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 226 |  |  |  |  |  |  |  | 226 | 782
Individually evaluated for impairment, Related loan balance | 2,250 |  |  |  |  |  |  |  | 2,250 | 3,898
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 2,315 |  |  |  |  |  |  |  | 2,315 | 1,807
Collectively evaluated for impairment, Related loan balance | 296,870 |  |  |  |  |  |  |  | 296,870 | 267,714
Consumer |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 214 |  |  |  |  | 214 | 182
Charged off |  |  |  |  |  |  |  |  | (208) | (96)
Recoveries |  |  |  |  |  |  |  |  | 48 | 8
Provision for loan losses |  |  |  |  |  |  |  |  | 107 | 120
Balance, end of year | 161 |  |  |  | 182 |  |  |  | 161 | 214
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 22 |  |  |  |  |  |  |  | 22 | 52
Individually evaluated for impairment, Related loan balance | 138 |  |  |  |  |  |  |  | 138 | 160
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 139 |  |  |  |  |  |  |  | 139 | 162
Collectively evaluated for impairment, Related loan balance | 12,933 |  |  |  |  |  |  |  | 12,933 | 15,952
Residential Real estate |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 1,061 |  |  |  |  | 1,061 | 1,042
Charged off |  |  |  |  |  |  |  |  | (589) | (3)
Recoveries |  |  |  |  |  |  |  |  | 2 | 27
Provision for loan losses |  |  |  |  |  |  |  |  | 390 | (5)
Balance, end of year | 864 |  |  |  | 1,042 |  |  |  | 864 | 1,061
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance |  |  |  |  |  |  |  |  |  | 513
Individually evaluated for impairment, Related loan balance | 854 |  |  |  |  |  |  |  | 854 | 2,345
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 864 |  |  |  |  |  |  |  | 864 | 548
Collectively evaluated for impairment, Related loan balance | 81,783 |  |  |  |  |  |  |  | 81,783 | 79,580
Indirect |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 774 |  |  |  |  | 774 | 693
Charged off |  |  |  |  |  |  |  |  | (341) | (458)
Recoveries |  |  |  |  |  |  |  |  | 183 | 286
Provision for loan losses |  |  |  |  |  |  |  |  | 372 | 253
Balance, end of year | 988 |  |  |  | 693 |  |  |  | 988 | 774
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 988 |  |  |  |  |  |  |  | 988 | 774
Collectively evaluated for impairment, Related loan balance | 116,698 |  |  |  |  |  |  |  | 116,698 | 85,186
Commercial |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 237 |  |  |  |  | 237 | 284
Charged off |  |  |  |  |  |  |  |  |  | (9)
Recoveries |  |  |  |  |  |  |  |  | 14 |
Provision for loan losses |  |  |  |  |  |  |  |  | (10) | (38)
Balance, end of year | 241 |  |  |  | 284 |  |  |  | 241 | 237
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | 204 |  |  |  |  |  |  |  | 204 | 217
Individually evaluated for impairment, Related loan balance | 204 |  |  |  |  |  |  |  | 204 | 217
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 37 |  |  |  |  |  |  |  | 37 | 20
Collectively evaluated for impairment, Related loan balance | 14,080 |  |  |  |  |  |  |  | 14,080 | 11,040
Construction |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 12 |  |  |  |  | 12 | 10
Provision for loan losses |  |  |  |  |  |  |  |  | (8) | 2
Balance, end of year | 4 |  |  |  | 10 |  |  |  | 4 | 12
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 4 |  |  |  |  |  |  |  | 4 | 12
Collectively evaluated for impairment, Related loan balance | 2,317 |  |  |  |  |  |  |  | 2,317 | 3,536
Commercial Real Estate |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | $ 291 |  |  |  |  | 291 | 259
Charged off |  |  |  |  |  |  |  |  | (13) |
Recoveries |  |  |  |  |  |  |  |  |  | 14
Provision for loan losses |  |  |  |  |  |  |  |  | 5 | 18
Balance, end of year | 283 |  |  |  | 259 |  |  |  | 283 | 291
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Related loan balance | 1,054 |  |  |  |  |  |  |  | 1,054 | 1,176
Collectively evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Collectively evaluated for impairment, Balance in allowance | 283 |  |  |  |  |  |  |  | 283 | 291
Collectively evaluated for impairment, Related loan balance | 69,059 |  |  |  |  |  |  |  | 69,059 | 72,420
Unallocated |  |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  |  |  |  |  |  |  | 14
Provision for loan losses |  |  |  |  |  |  |  |  |  | (14)
Balance, end of year |  |  |  |  | $ 14 |  |  |  |  |
Commercial Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment: |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment, Balance in allowance | $ 204 |  |  |  |  |  |  |  | $ 204 | $ 217

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