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Deposits - Schedule of Time Deposit Maturities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Time Deposits, Rolling Year Maturity [Abstract]  
2015 $ 976,051us-gaap_TimeDepositMaturitiesYearOne
2016 438,340us-gaap_TimeDepositMaturitiesYearTwo
2017 198,431us-gaap_TimeDepositMaturitiesYearThree
2018 53,927us-gaap_TimeDepositMaturitiesYearFour
2019 44,914us-gaap_TimeDepositMaturitiesYearFive
Total time deposits $ 1,711,663us-gaap_TimeDeposits