Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Rate, Percent	35.00%	35.00%	35.00%
Other Comprehensive Income (Loss), Net of Tax
Unrealized holding gains (losses) arising during the period. before tax	$ (24,545)	$ 29,643	$ (35,318)
Unrealized holding gains (losses) arising during the period, tax effect	8,591	(10,375)	12,361
Unrealized holding gains (losses) arising during the period, net of tax	(15,954)	19,268	(22,957)
Reclassification adjustment for (gains) losses included in net income	5,415	20	227
Reclassification adjustment for (gains) losses included in net income, tax effect	(1,895)	(7)	(79)
Reclassification adjustment for (gains) losses included in net income, net of tax	3,520	13	148
Effects on DAC and CCRA, before tax	328	(315)	1,135
Effects on DAC and CCRA, tax effect	(115)	110	(398)
Effects on DAC and CCRA, net of tax	213	(205)	737
Change in tax valuation allowance, before tax	0	0	0
Change in tax valuation allowance, tax effect	(42)	(21)	(20)
Change in tax valuation allowance, net of tax.	(42)	(21)	(20)
Other comprehensive income (loss), before tax	(18,802)	29,348	(33,956)
Other comprehensive income (loss), tax effect	6,539	(10,293)	11,864
Other comprehensive income (loss)	$ (12,263)	$ 19,055	$ (22,092)