Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months Securities	2	1
12 months or more securities	4	9
Total Securities	6	10
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 Months, Fair Value	$ 3,009	$ 990
12 Months or More, Fair Value	5,021	10,988
Total, Estimated Fair Value	8,030	11,978
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, Unrealized Losses	1	5
12 Months or More, Unrealized Losses	3	95
Total, Unrealized Losses	$ 4	$ 100
U.S. Treasury Securities [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months Securities		1
12 months or more securities		1
Total Securities		2
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 Months, Fair Value		$ 990
12 Months or More, Fair Value		991
Total, Estimated Fair Value		1,981
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, Unrealized Losses		5
12 Months or More, Unrealized Losses		6
Total, Unrealized Losses		$ 11
U.S. Government Agency Notes [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Less than 12 months Securities	2
12 months or more securities	4	8
Total Securities	6	8
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 Months, Fair Value	$ 3,009
12 Months or More, Fair Value	5,021	$ 9,997
Total, Estimated Fair Value	8,030	9,997
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, Unrealized Losses	1
12 Months or More, Unrealized Losses	3	89
Total, Unrealized Losses	$ 4	$ 89