Accumulated Other Comprehensive Loss - Schedule Of Amounts Reclassified Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items]
Related income tax expense	$ (6,125)	$ (6,497)	$ (17,492)	$ (12,300)
Other comprehensive income (loss), net of tax	(1,639)	1,705	(733)	2,481
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	(2,116)	(818)	(2,130)	(901)
Related income tax expense	781	301	786	332
Other comprehensive income (loss), net of tax	$ (1,335)	$ (517)	$ (1,344)	$ (569)