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Other Comprehensive Income (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Class of Stock [Line Items]        
Accumulated other comprehensive income (loss) $ (30,463) $ (41,258) $ 2,787 $ 4,101
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
       
Class of Stock [Line Items]        
Accumulated other comprehensive income (loss) (13,030) (13,099) (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 (loss) (12,100)      
Net Unrealized Gains (Losses) on Investment Securities Available for Sale [Member]
       
Class of Stock [Line Items]        
Accumulated other comprehensive income (loss) (18,166) (28,936) 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 (loss) $ (13,300)