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, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items]
Related income tax expense (benefit)	$ (7,056)	$ (5,526)	$ (18,398)	$ (14,450)
Other comprehensive income (loss), net of tax	(633)	2,112	(4,752)	3,542
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) losses reclassified into earnings	0	(458)	(93)	(954)
Related income tax expense (benefit)	0	172	34	359
Other comprehensive income (loss), net of tax	$ 0	$ (286)	$ (59)	$ (595)