Other Comprehensive Income (Loss) (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Class of Stock [Line Items]
Accumulated other comprehensive income	$ (33,060)	$ 2,787	$ 4,101
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Class of Stock [Line Items]
Accumulated other comprehensive income	(13,237)	(13,304)	(13,373)
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member] | Valuation Allowance of Deferred Tax Assets [Member]
Class of Stock [Line Items]
Accumulated other comprehensive income	(12,100)
Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member]
Class of Stock [Line Items]
Accumulated other comprehensive income	(20,689)	15,751	17,111
Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member] | Valuation Allowance of Deferred Tax Assets [Member]
Class of Stock [Line Items]
Accumulated other comprehensive income	$ 13,300