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Interest Bearing Deposits (Remaining Maturities Of Time Deposits of $100,000 Or More) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Banking and Thrift [Abstract]    
Three months or less $ 384,868,000us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsOrLess  
Over three months through six months 331,049,000us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreThreeMonthsThroughSixMonths  
Over six months through twelve months 376,671,000us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreSixMonthsThrough12Months  
Over twelve months 673,133,000us-gaap_ContractualMaturitiesTimeDeposits100000OrMoreAfter12Months  
Time, $100,000 and over 1,765,721,000us-gaap_TimeDeposits100000OrMore 1,065,380,000us-gaap_TimeDeposits100000OrMore
Time Deposit Of One Hundred Thousand Or More $ 100,000umpq_TimeDepositOfOneHundredThousandOrMore