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Deposits (Details 2) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deposits [Abstract]    
Aggregate amount of certificates of deposit equal to or greater than $100,000 $ 871,200,000us-gaap_TimeDeposits100000OrMoreDomestic $ 1,060,000,000us-gaap_TimeDeposits100000OrMoreDomestic
Brokered certificates of deposit $ 0us-gaap_InterestBearingDomesticDepositBrokered