Retirement Plans (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		$ 9,669	$ 11,153	$ 10,415
Defined benefit plan, fair value of plan assets, excluding cash and cash equivalents		$ 9,381	$ 10,742
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		$ (164)	$ (49)
Interest cost on projected benefit obligation		424	471
Defined benefit plan, expected return on plan assets		(694)	(646)
Defined contribution plan, employer discretionary contribution amount		200
Scenario, Forecast for 2017 [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost	$ 0
Interest cost on projected benefit obligation	454
Defined benefit plan, expected return on plan assets	(597)
Defined benefit plan, amortization of losses (gains)	$ 143
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		300	400
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, fair value of plan assets		5,900
Defined benefit plan, fair value of plan assets, excluding cash and cash equivalents		$ 5,913	7,156
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		$ 3,500
Defined benefit plan, fair value of plan assets, excluding cash and cash equivalents		$ 3,468	$ 3,586
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