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Loans and Leases (Summary Of Activity Related To The FDIC Indemnification Asset) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jun. 30, 2013
Mar. 31, 2013
Receivables [Abstract]        
Balance, beginning of period $ 4,417us-gaap_FDICIndemnificationAsset   $ 18,362us-gaap_FDICIndemnificationAsset $ 23,174us-gaap_FDICIndemnificationAsset
Change in FDIC indemnification asset (1,286)us-gaap_FDICIndemnificationAssetPeriodIncreaseDecrease (4,840)us-gaap_FDICIndemnificationAssetPeriodIncreaseDecrease    
Transfers to due from FDIC and other (1,270)umpq_TransfersToDueFromFDIC 28umpq_TransfersToDueFromFDIC    
Balance, end of period $ 1,861us-gaap_FDICIndemnificationAsset $ 4,417us-gaap_FDICIndemnificationAsset $ 18,362us-gaap_FDICIndemnificationAsset $ 23,174us-gaap_FDICIndemnificationAsset