Accumulated Other Comprehensive Loss - Schedule Of Amounts Reclassified Out of Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items]
Related income tax expense	$ (11,367)	$ (5,803)
Other comprehensive income (loss), net of tax	906	776
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	(14)	(83)
Related income tax expense	5	31
Other comprehensive income (loss), net of tax	$ (9)	$ (52)