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Cash and Due From Banks (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Banking and Thrift [Abstract]    
Federal reserve cash required reserve $ 80.7umpq_FederalReserveCashRequiredReserve $ 27.2umpq_FederalReserveCashRequiredReserve