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Deposits - Scheduled Maturities of Time Deposits (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Banking and Thrift [Abstract]    
2015 $ 1,434,546us-gaap_TimeDepositMaturitiesYearOne  
2016 721,490us-gaap_TimeDepositMaturitiesYearTwo  
2017 285,196us-gaap_TimeDepositMaturitiesYearThree  
2018 70,809us-gaap_TimeDepositMaturitiesYearFour  
2019 73,750us-gaap_TimeDepositMaturitiesYearFive  
Thereafter 156,677us-gaap_TimeDepositMaturitiesAfterYearFive  
Total time deposits $ 2,742,468us-gaap_TimeDeposits $ 2,179,269us-gaap_TimeDeposits