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Allowance for Loan Losses (Details 1) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Ending Balance Attributable to Loans |  |  |  |  |  |
Individually evaluated for impairment | $ 34 |  | $ 625 |  |  |
Collectively evaluated for impairment | 20,267 |  | 19,284 |  |  |
Ending Balance | 20,301 | $ 20,071 | 19,909 | $ 19,802 | $ 19,680 | $ 18,773
Loans |  |  |  |  |  |
Individually evaluated for impairment | 9,435 |  | 10,082 |  |  |
Collectively evaluated for impairment | 1,938,625 |  | 1,901,080 |  |  |
Total | 1,949,587 |  | 1,913,022 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Ending Balance Attributable to Loans |  |  |  |  |  |
Individually evaluated for impairment | 34 |  | 619 |  |  |
Collectively evaluated for impairment | 9,303 |  | 9,662 |  |  |
Ending Balance | 9,337 | 9,498 | 10,281 | 9,937 | 10,223 | 9,731
Loans |  |  |  |  |  |
Individually evaluated for impairment | 5,063 |  | 9,619 |  |  |
Collectively evaluated for impairment | 1,151,707 |  | 1,134,701 |  |  |
Total | 1,158,297 |  | 1,146,180 |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Ending Balance Attributable to Loans |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 6 |  |  |
Collectively evaluated for impairment | 1,340 |  | 1,449 |  |  |
Ending Balance | 1,340 | 1,382 | 1,455 | 1,519 | 1,514 | 1,553
Loans |  |  |  |  |  |
Individually evaluated for impairment | 4,372 |  | 463 |  |  |
Collectively evaluated for impairment | 440,335 |  | 436,944 |  |  |
Total | 444,707 |  | 437,407 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Ending Balance Attributable to Loans |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 7,537 |  | 6,709 |  |  |
Ending Balance | 7,537 | 7,131 | 6,709 | 6,638 | 6,218 | 5,767
Loans |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 346,583 |  | 329,435 |  |  |
Total | 346,583 |  | 329,435 |  |  |
Unallocated |  |  |  |  |  |
Ending Balance Attributable to Loans |  |  |  |  |  |
Individually evaluated for impairment | 0 |  | 0 |  |  |
Collectively evaluated for impairment | 2,087 |  | 1,464 |  |  |
Ending Balance | 2,087 | $ 2,060 | 1,464 | $ 1,708 | $ 1,725 | $ 1,722
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |
Ending Balance Attributable to Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses | 0 |  | 0 |  |  |
Loans |  |  |  |  |  |
Financing Receivable, Net | 1,527 |  | 1,860 |  |  |
Financial Asset Acquired with Credit Deterioration [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Ending Balance Attributable to Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses | 0 |  | 0 |  |  |
Loans |  |  |  |  |  |
Financing Receivable, Net | 1,527 |  | 1,860 |  |  |
Financial Asset Acquired with Credit Deterioration [Member] | Residential Portfolio Segment [Member] |  |  |  |  |  |
Ending Balance Attributable to Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses | 0 |  | 0 |  |  |
Loans |  |  |  |  |  |
Financing Receivable, Net | 0 |  | 0 |  |  |
Financial Asset Acquired with Credit Deterioration [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |  |
Ending Balance Attributable to Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses | 0 |  | 0 |  |  |
Loans |  |  |  |  |  |
Financing Receivable, Net | 0 |  | 0 |  |  |
Financial Asset Acquired with Credit Deterioration [Member] | Unallocated |  |  |  |  |  |
Ending Balance Attributable to Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses | $ 0 |  | $ 0 |  |  |

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