Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Retirement Benefits [Abstract]
Automatic Annual Contribution Employees Hired Before January 1, 2009 Benefit Reduction Under Certain Amendments Minimum, percent			5.00%
Automatic Annual Contribution Employees Hired Before January 1, 2009 Due Benefit Reduction Under Certain Amendments Maximum, percent			7.00%
Employer's matching contribution to 401(k) of employees hired on or after January 1, 2009, percent			50.00%
Maximum annual contribution per employee, percent			3.00%
Funding and administrative costs of noncontributory defined benefit retirement plan and 401(k) plan [Abstract]
401(k) plan	$ 131	$ 119	$ 395	$ 336
Qualified noncontributory defined benefit retirement plan [Member]
Funding and administrative costs of noncontributory defined benefit retirement plan and 401(k) plan [Abstract]
Qualified noncontributory defined benefit retirement plan	215	279	730	804
Components of net periodic pension cost [Abstract]
Service cost	0	0	0	0
Interest cost	20	17	57	51
Amortization of unrecognized net loss	0	4	0	12
Net periodic pension cost	20	$ 21	57	$ 63
Recognized in accumulated other comprehensive income [Abstract]
Net actuarial loss	88		88		$ 88
Past service cost	0		0		0
Total recognized, net of tax	$ 88		$ 88		$ 88