Securities - Amortized Cost And Approximate Fair Value Of Securities Available For Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 100,470	$ 89,853
Gross Unrealized Gains	495	358
Gross Unrealized Losses	(1,168)	(1,600)
Fair Value	99,797	88,611
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	22,304	13,115
Gross Unrealized Gains	34	29
Gross Unrealized Losses	(94)	(57)
Fair Value	22,244	13,087
State And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	40,681	41,255
Gross Unrealized Gains	282	203
Gross Unrealized Losses	(524)	(770)
Fair Value	40,439	40,688
U.S. Government-Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	35,485	33,483
Gross Unrealized Gains	146	126
Gross Unrealized Losses	(550)	(755)
Fair Value	35,081	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