Significant Accounting Policies, Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance				$ 200,790
Ending balance		$ 139,639		139,639
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(26,853)	$ 18,411	(13,565)	$ 39,747
Ending balance		(26,498)	(17,957)	(26,498)	(17,957)
Unrealized Losses on Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive loss before reclassifications, net of tax	[1]	(170)	(16,157)	(13,458)	(37,493)
Amounts reclassified from accumulated other comprehensive income (loss)		525	(20,211)	525	(20,211)
Net current period other comprehensive loss		355	(36,368)	(12,933)	(57,704)
Income tax benefit included in other comprehensive income		$ 0	$ 0	$ 0	$ 0

[1] There was no tax expense or benefit for the three and nine months ended September 30, 2016 and 2015.