Merger (Narrative) (Details) - USD ($)		3 Months Ended		6 Months Ended
	Jan. 08, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 07, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill		$ 23,107,000		$ 23,107,000			$ 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	19,189,000
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
Goodwill adjustment		579,000,000
Fair value of purchased loans	$ 70,769,000
Pro Forma Earnings		$ 2,768,000	$ 1,529,000	4,831,000	$ 357,000
Severance and retention bonus expenses				518,000
Scottdale Bank and Trust Company [Member] | Excluded Acquisition-related Costs [Member]
Business Acquisition [Line Items]
Pro Forma Earnings				$ 1,262,000
Scottdale Bank and Trust Company [Member] | Acquisition-related Costs [Member]
Business Acquisition [Line Items]
Pro Forma Earnings					$ 1,262,000