Employee Benefit Plan (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Minimum eligibility criteria of full-time pre-merger bank employees for Bank of Essex noncontributory defined benefit pension plan	21 years
Targeted asset allocation	100.00%	100.00%
Employee's contribution vesting percent	100.00%
Amounts charged to expense under plans	$ 614,000	$ 617,000
Combined BOE 401(k) and TFC 401(k) Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employee's contribution of compensation, subject to statutory limitations	100.00%
Combined BOE 401(k) and TFC 401(k) Plans [Member] | Contribution Tier 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Company's matching employee contributions	100.00%
Employee's contribution	3.00%
Combined BOE 401(k) and TFC 401(k) Plans [Member] | Contribution Tier 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Company's matching employee contributions	50.00%
Employee's contribution	2.00%
Deferred Compensation Agreements [Member]
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation expense	$ 110,000	204,000
Recorded liability	2,100,000	2,100,000
Non-Qualified Defined Contribution Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation expense	444,000	343,000
Recorded liability	$ 1,600,000	$ 1,200,000
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Targeted asset allocation	74.00%
Mutual Funds - Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Targeted asset allocation	26.00%	23.00%