Accumulated Other Comprehensive Loss - Schedule Of Amounts Reclassified Out of Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items]
Related income tax expense	$ (6,497)	$ (6,573)	$ (12,300)	$ (11,342)
Other comprehensive income (loss), net of tax	1,705	(4,208)	2,481	(4,118)
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	(818)	(9)	(901)	(93)
Related income tax expense	301	3	332	34
Other comprehensive income (loss), net of tax	$ (517)	$ (6)	$ (569)	$ (59)