Retirement Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		$ 10,988	$ 9,669	$ 11,153
Favorable rate of return equal to or greater than average inflation rate		5.00%
Investment objective achievement period		60 years
Single stock issue restricted among total portfolio value		5.00%
Securities held in mutual or commingled funds		90.00%
Expected return on plan assets		6.50%	6.50%	6.50%
Net periodic pension cost		$ (10)	$ (164)
Interest cost on projected benefit obligation		454	424
Defined benefit plan, expected return on plan assets		(607)	(694)
Defined contribution plan, employer discretionary contribution amount		700	200
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost	$ (190)
Interest cost on projected benefit obligation	355
Defined benefit plan, expected return on plan assets	(684)
Amortization of net loss	$ 139
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		600	$ 300
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		$ 7,000
Equity Securities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, target plan asset allocations range		45.00%
Equity Securities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, target plan asset allocations range		75.00%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		$ 3,400
Standard Commercial P & C Business Unit [Member]
Defined Benefit Plan Disclosure [Line Items]
Minimum hours of service to participate within defined benefit plan		1000 hours