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Premises And Equipment - Narrative (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Property, Plant and Equipment [Abstract]      
Depreciation and amortization expense $ 7.0 $ 7.6 $ 7.1
Rent expense $ 1.9 $ 2.4 $ 2.6