Investment Securities Available for Sale (Securities with Continuous Unrealized Losses) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
In loss position for Less than 12 months, Fair Value	$ 5,958	$ 15,999
In loss position for 12 months or more, Fair Value	0	0
Total Fair Value	5,958	15,999
In loss position for Less than 12 months, Unrealized Losses	(62)	(260)
In loss position for 12 months or more, Unrealized Losses	0	0
Total Unrealized Losses	(62)	(260)
Marketable equity securities
Schedule of Available-for-sale Securities [Line Items]
In loss position for Less than 12 months, Fair Value	5,958	5,746
In loss position for 12 months or more, Fair Value	0	0
Total Fair Value	5,958	5,746
In loss position for Less than 12 months, Unrealized Losses	(62)	(254)
In loss position for 12 months or more, Unrealized Losses	0	0
Total Unrealized Losses	$ (62)	(254)
Mutual funds invested in fixed income securities
Schedule of Available-for-sale Securities [Line Items]
In loss position for Less than 12 months, Fair Value		10,253
In loss position for 12 months or more, Fair Value		0
Total Fair Value		10,253
In loss position for Less than 12 months, Unrealized Losses		(6)
In loss position for 12 months or more, Unrealized Losses		0
Total Unrealized Losses		$ (6)