Acquisition of The Scottdale Bank and Trust Company (Narrative) (Details) - USD ($)		12 Months Ended
	Jan. 08, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 07, 2018
Business Acquisition [Line Items]
Goodwill		$ 62,840,000	$ 62,840,000
Amortization expense		1,398,000	1,430,000	$ 1,224,000
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%
Common stock shares issued to acquire the company	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	19,178,000
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	$ 629,000
Finite-lived intangible assets, amortization expense, year two	539,000
Finite-lived intangible assets, amortization expense, year three	449,000
Finite-lived intangible assets, amortization expense, year four	359,000
Finite-lived intangible assets, amortization expense, year five	269,000
Finite lived intangible assets, amortization expense, four years after year five	270,000
Fair value of purchased loans	$ 70,769,000
Pro forma earnings				11,736,000	$ 8,075,000
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				1,304,000
Income tax nondeductible expenses				$ 205,000
Scottdale Bank and Trust Company [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Amortization expense		$ 719,000	$ 808,000