Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
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	$ 152	$ 147	$ 312	$ 312
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	282	271	561	541
Components of net periodic pension cost [Abstract]
Interest cost	13	16	26	32
Amortization of unrecognized net loss	2	0	4	0
Net periodic pension cost	15	$ 16	30	$ 32
Recognized in accumulated other comprehensive income [Abstract]
Net actuarial loss	303		303		$ 306
Past service cost	0		0		0
Total recognized, net of tax	$ 303		$ 303		$ 306