Investment Securities (Maturity Dates of Marketable Debt Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Market Value	$ 54,885	$ 83,445
Under 1 Year	34,467
1 Year up to 5 Years	20,418
More than 5 Years	0
U.S. Government securities
Debt Securities, Available-for-sale [Line Items]
Market Value	12,754
Under 1 Year	8,761
1 Year up to 5 Years	3,993
More than 5 Years	0
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Market Value	37,145
Under 1 Year	22,570
1 Year up to 5 Years	14,575
More than 5 Years	0
U.S. mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Market Value	4,984
Under 1 Year	3,134
1 Year up to 5 Years	1,850
More than 5 Years	0
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Market Value	2
Under 1 Year	2
1 Year up to 5 Years	0
More than 5 Years	$ 0

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