Fair Value Of Financial Instruments (Narrative)(Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Trust preferred securities amotized cost $ 249,050 $ 267,161
Available-for-sale Securities 227,244 245,023
Collateralized debt obligations [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Trust preferred securities amotized cost 36,581 36,385
Available-for-sale Securities $ 9,339 $ 9,447