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Fair Value Of Financial Instruments (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
security
Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 333,736 $ 245,106
Available-for-sale Securities 304,681 223,273
Collateralized debt obligations [Member]
    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Acquired Trust Preferred Securities, Number of Securities 18  
Amortized Cost 37,045 36,798
Available-for-sale Securities $ 15,030 $ 11,442