Investment Securities (Schedule of amortized cost and estimated fair value by contractual maturity of debt securities - AFS) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Available-for-Sale Amortized Cost
Due in one year or less	$ 0
Due after one year through five years	10,610
Due after five years through ten years	3,000
Sub-total	13,610
Totals	18,026	$ 18,563
Fair Value Available-for-Sale
Due in one year or less	0
Due after one year through five years	10,597
Due after five years through ten years	3,000
Sub-total	13,597
Securities available for sale	18,000	18,331
Mortgage-backed securities - residential
Available-for-Sale Amortized Cost
Totals	4,416	5,953
Fair Value Available-for-Sale
Securities available for sale	$ 4,403	$ 5,876

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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