Summary of Significant Accounting Policies (Schedule of Other, Net) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accounting Policies [Abstract]
Interest and dividend income	$ 968	$ 3,139	$ 3,648	$ 6,347
Net gains (losses) recognized on investment securities	4,781	2,315	(7,459)	7,088
Net periodic benefit cost other than the service costs	(454)	(575)	(909)	(1,116)
Other income (expense)	2,340	(98)	1,700	(98)
Other, net	$ 7,635	$ 4,781	$ (3,020)	$ 12,221