Benefit Plans (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Defined Contribution Plan Disclosure [Line Items]
Number of deferred compensation plans related to directors and executives | item	2
Defined Contribution Plan [Member] | 401(K) Savings and Investment Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Company contribution of specific percentage of employee compensation contributed	100.00%	100.00%	100.00%
Percent of contribution eligible for match	4.00%	4.00%	4.00%
Expense for the 401(k) savings and investment plan	$ 676,000	$ 590,000	$ 587,000
Supplemental Defined Contribution Deferred Compensation Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Benefit plans expense	60,000
Benefit plans interest expense	3,000
Benefit plans accrued liability	60,000
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Contribution Plan Disclosure [Line Items]
Benefit plans expense	371,000	261,000	256,000
Benefit plans accrued liability	4,264,000	4,140,000
Director's Post Retirement Split-Dollar Life Insurance Benefit [Member]
Defined Contribution Plan Disclosure [Line Items]
Benefit plans expense	40,000	43,000	$ 39,000
Benefit plans accrued liability	484,000	$ 444,000
Directors Deferred Compensation Plans [Member]
Defined Contribution Plan Disclosure [Line Items]
Benefit plans interest expense	600
Benefit plans accrued liability	29,000
Executives Deferred Compensation Plans [Member]
Defined Contribution Plan Disclosure [Line Items]
Benefit plans interest expense	3,000
Benefit plans accrued liability	$ 123,000