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Merger (Narrative) (Details) - USD ($) |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 08, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Jan. 07, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 22,528,000 |  |  | $ 3,918,000
Scottdale Bank and Trust Company [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date of acquisition | Jan. 08, 2018 |  |  |  |
Per share price | $ 34.16 |  |  | $ 1,166 |
Ratio of conversion of acquiree's shares to entity's shares | 38.88% |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 1,878,827 |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable | $ 64,181,000 |  |  |  |
Payments to Acquire Businesses, Gross | 2,792,000 |  |  |  |
Business Combination, Consideration Transferred | 66,973,000 |  |  |  |
Goodwill | 18,610,000 |  |  |  |
Finite-lived Intangible Assets Acquired | $ 4,940,000 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | $ 898,000 |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 808,000 |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 719,000 |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 629,000 |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 539,000 |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, after Year Five | 1,347,000 |  |  |  |
Fair value of purchased loans | $ 70,686,000 |  |  |  |
Pro Forma Earnings |  | 2,054,000 | $ 1,268,000 |  |
Scottdale Bank and Trust Company [Member] | Excluded Acquisition-related Costs [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Pro Forma Earnings |  | $ 1,273,000 |  |  |
Scottdale Bank and Trust Company [Member] | Acquisition-related Costs [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Pro Forma Earnings |  |  | $ 1,273,000 |  |

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