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Supplemental Executive Retirement Plan (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) age installment	Dec. 31, 2018 USD ($)	Dec. 31, 2013 USD ($)
Defined benefit plan, net periodic benefit cost	$ 404	$ 686
Supplemental Executive Retirement and Death Benefit Agreements
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
Other investments	$ 2,600		$ 11,400
Annuity contracts accrued income	23	$ 81
Purchased Fixed Annuity for Financing Retirement Benefits | Supplemental Executive Retirement and Death Benefit Agreements | Other Assets
Cash surrender value of life insurance	$ 14,700

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