Income Taxes Components of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Deferred Income Tax Expense (Benefit)									$ (4,085)	$ 79,154
Current Income Tax Expense									(3,071)	82,900	$ 5,871
Deferred Tax Expense Less OCI Valuation Allowance Release									4,043	(79,175)	(3,733)
Federal income tax expense	$ 213	$ (242)	$ 1,076	$ (75)	$ 1,921	$ 952	$ 358	$ 494	972	3,725	2,138
Release of Tax Valuation Allowance in Other Comprehensive Income									$ 42	$ 21	$ 20