Accumulated Other Comprehensive Loss - Schedule Of Amounts Reclassified Out of Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items]
Related income tax expense	$ (6,010)	$ (7,056)	$ (18,310)	$ (18,398)
Other comprehensive income (loss), net of tax	(412)	(633)	2,069	(4,752)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items]
Net securities gains reclassified into earnings	(71)	0	(972)	(93)
Related income tax expense	26	0	358	34
Other comprehensive income (loss), net of tax	$ (45)	$ 0	$ (614)	$ (59)