Employee Benefit Plans (Components of the Net Periodic Pension Plan Cost) (Pension) (Details) - USD ($)	1 Months Ended		3 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost			$ 70,000	$ 76,000
Interest cost			413,000	435,000
Expected return on assets			(751,000)	(673,000)
Amortization of transition asset			0	0
Amortization of net actuarial loss			264,000	212,000
Amortization of prior service cost			3,000	3,000
Net pension expense/(credit) included in employee benefits			$ (1,000)	$ 53,000
Discretionary contribution, percent of participant's base salary			15.00%
Two Employees [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer discretionary contribution		$ 63,500
Defined benefit plan participation expense			$ 7,943
Four Employees [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer discretionary contribution	$ 112,708
Defined benefit plan participation expense			$ 14,089
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan modification description			Effective April 30, 2010, the Pension Plan was amended, resulting in a "soft freeze", the effect of which prohibits new entrants into the plan and ceases crediting of additional years of service after that date. Effective January 1, 2013, the Pension Plan was amended to unfreeze it for those employees for whom the sum of (a) their ages, at their closest birthday, plus (b) years of service for vesting purposes equals 80 or greater. The "soft freeze" continues to apply to all other plan participants. Pension benefits for these participants are managed through discretionary contributions to the First United Corporation 401(k) Profit Sharing Plan (the "401(k) Plan").
Employer discretionary contribution			$ 3,000,000