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Loans Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Rollfoward of the Allowance for Loan Losses for the Quarterly Report [Roll Forward] |  |  |
Allowance for Credit Losses, Beginning Balance | $ 17,012 | $ 16,038 | $ 15,570
Charge-offs | (1,559) | (1,270) | (1,106)
Recoveries | 397 | 211 | 227
Provision | 2,736 | 2,033 | 1,347
Allowance for Credit Losses, Ending Balance | 18,586 | 17,012 | 16,038
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |
Allowance for Loan Losses - Individually Evaluated for Impairment | 106 | 0 |
Allowance for Loan Losses - Collectively Evaluated for Impairment | 18,480 | 17,012 |
Ending Loan Balance - Individually Evaluated for Impairment | 3,683 | 2,079 |
Ending Loan Balance - Collectively Evaluated for Impairment | 1,947,087 | 1,751,189 |
Commercial [Member] |  |  |
Rollfoward of the Allowance for Loan Losses for the Quarterly Report [Roll Forward] |  |  |
Allowance for Credit Losses, Beginning Balance | 1,017 | 1,827 | 2,100
Charge-offs | (2) | (97) | (62)
Recoveries | 9 | 23 | 34
Provision | 849 | (736) | (245)
Allowance for Credit Losses, Ending Balance | 1,873 | 1,017 | 1,827
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |
Allowance for Loan Losses - Individually Evaluated for Impairment | 94 | 0 |
Allowance for Loan Losses - Collectively Evaluated for Impairment | 1,779 | 1,017 |
Ending Loan Balance - Individually Evaluated for Impairment | 489 | 0 |
Ending Loan Balance - Collectively Evaluated for Impairment | 128,760 | 105,155 |
Commercial Real Estate [Member] |  |  |
Rollfoward of the Allowance for Loan Losses for the Quarterly Report [Roll Forward] |  |  |
Allowance for Credit Losses, Beginning Balance | 5,677 | 4,520 | 4,128
Charge-offs | (380) | (195) | (7)
Recoveries | 0 | 0 | 0
Provision | (793) | 1,352 | 399
Allowance for Credit Losses, Ending Balance | 4,504 | 5,677 | 4,520
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |
Allowance for Loan Losses - Individually Evaluated for Impairment | 2 | 0 |
Allowance for Loan Losses - Collectively Evaluated for Impairment | 4,502 | 5,677 |
Ending Loan Balance - Individually Evaluated for Impairment | 1,537 | 890 |
Ending Loan Balance - Collectively Evaluated for Impairment | 442,711 | 430,756 |
Other Consumer [Member] |  |  |
Rollfoward of the Allowance for Loan Losses for the Quarterly Report [Roll Forward] |  |  |
Allowance for Credit Losses, Beginning Balance | 6,120 | 5,554 | 5,210
Charge-offs | (1,101) | (871) | (711)
Recoveries | 388 | 182 | 193
Provision | 2,197 | 1,255 | 862
Allowance for Credit Losses, Ending Balance | 7,604 | 6,120 | 5,554
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |
Allowance for Loan Losses - Individually Evaluated for Impairment | 0 | 0 |
Allowance for Loan Losses - Collectively Evaluated for Impairment | 7,604 | 6,120 |
Ending Loan Balance - Individually Evaluated for Impairment | 95 | 91 |
Ending Loan Balance - Collectively Evaluated for Impairment | 602,732 | 537,270 |
Residential Portfolio Segment [Member] |  |  |
Rollfoward of the Allowance for Loan Losses for the Quarterly Report [Roll Forward] |  |  |
Allowance for Credit Losses, Beginning Balance | 4,198 | 3,790 | 3,369
Charge-offs | (76) | (107) | (326)
Recoveries | 0 | 6 | 0
Provision | 483 | 509 | 747
Allowance for Credit Losses, Ending Balance | 4,605 | 4,198 | 3,790
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |
Allowance for Loan Losses - Individually Evaluated for Impairment | 10 | 0 |
Allowance for Loan Losses - Collectively Evaluated for Impairment | 4,595 | 4,198 |
Ending Loan Balance - Individually Evaluated for Impairment | 1,562 | 1,098 |
Ending Loan Balance - Collectively Evaluated for Impairment | 772,884 | 678,008 |
Unallocated [Member] |  |  |
Rollfoward of the Allowance for Loan Losses for the Quarterly Report [Roll Forward] |  |  |
Allowance for Credit Losses, Beginning Balance | 0 | 347 | 763
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Provision | 0 | (347) | (416)
Allowance for Credit Losses, Ending Balance | 0 | 0 | $ 347
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract] |  |  |
Allowance for Loan Losses - Individually Evaluated for Impairment | 0 | 0 |
Allowance for Loan Losses - Collectively Evaluated for Impairment | 0 | 0 |
Ending Loan Balance - Individually Evaluated for Impairment | 0 | 0 |
Ending Loan Balance - Collectively Evaluated for Impairment | $ 0 | $ 0 |

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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=66008989&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=66008989&loc=SL6953423-111524 + Details
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