Securities - Amortized Cost And Approximate Fair Value Of Securities Available For Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 97,566	$ 89,853
Gross Unrealized Gains	1,279	358
Gross Unrealized Losses	(778)	(1,600)
Fair Value	98,067	88,611
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	16,960	13,115
Gross Unrealized Gains	60	29
Gross Unrealized Losses	(27)	(57)
Fair Value	16,993	13,087
State And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	42,300	41,255
Gross Unrealized Gains	1,040	203
Gross Unrealized Losses	(267)	(770)
Fair Value	43,073	40,688
U.S. Government-Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	36,306	33,483
Gross Unrealized Gains	146	126
Gross Unrealized Losses	(484)	(755)
Fair Value	35,968	32,854
Corporate Debt [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,000	2,000
Gross Unrealized Gains	33	0
Gross Unrealized Losses	0	(18)
Fair Value	$ 2,033	$ 1,982