Supplemental Executive Retirement Plan (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) installment age	Dec. 31, 2019 USD ($) insuranceCarrier	Dec. 31, 2018 USD ($)	Dec. 31, 2013 USD ($) insuranceCarrier
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, net periodic benefit cost	$ 428	$ 404	$ 686
Annuity contract financed payments period	15 years
Supplemental Executive Retirement and Death Benefit Agreements
Defined Benefit Plan Disclosure [Line Items]
Time period for calculating base salary under SERP agreements	5 years
Retirement age | age	67
Share-based compensation arrangement by share-based payment award, award vesting period	6 years
Retirement plan monthly instalments | installment	180
Purchased Fixed Annuity for Financing Retirement Benefits | Supplemental Executive Retirement and Death Benefit Agreements
Defined Benefit Plan Disclosure [Line Items]
Other investments		2,600		$ 11,400
Annuity contracts accrued income	$ 45	$ 23	$ 81
Number of Insurance Carriers | insuranceCarrier		2		4
Purchased Fixed Annuity for Financing Retirement Benefits | Supplemental Executive Retirement and Death Benefit Agreements | Other Assets
Defined Benefit Plan Disclosure [Line Items]
Cash surrender value of life insurance	$ 14,500	$ 14,700