Changes In Accumulated Other Comprehensive Income (Loss) By Component (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	$ (8,118)	$ 1,064
Other comprehensive income (loss) before	10,070	(8,354)
Amounts reclassified from accumulated other comprehensive income to net income	(2,074)	(828)
Net current-period other comprehensive income (loss)	7,996	(9,182)
Accumulated Other Comprehensive Income (Loss), Ending Balance	(122)	(8,118)
Unrealized Gains (Losses) on Available-for-sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	(8,118)	1,064
Other comprehensive income (loss) before	11,334	(8,354)
Amounts reclassified from accumulated other comprehensive income to net income	(2,074)	(828)
Net current-period other comprehensive income (loss)	9,260	(9,182)
Accumulated Other Comprehensive Income (Loss), Ending Balance	1,142	(8,118)
Unrealized Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Beginning Balance	0	0
Other comprehensive income (loss) before	(1,264)	0
Amounts reclassified from accumulated other comprehensive income to net income	0	0
Net current-period other comprehensive income (loss)	(1,264)	0
Accumulated Other Comprehensive Income (Loss), Ending Balance	$ (1,264)	$ 0