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Time Deposits - Summary of Scheduled Maturities of all Time Deposits (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Investments Schedule [Abstract]  
2015 $ 478,610us-gaap_TimeDepositMaturitiesYearOne
2016 121,816us-gaap_TimeDepositMaturitiesYearTwo
2017 51,816us-gaap_TimeDepositMaturitiesYearThree
2018 47,463us-gaap_TimeDepositMaturitiesYearFour
2019 51,410us-gaap_TimeDepositMaturitiesYearFive
Thereafter 164us-gaap_TimeDepositMaturitiesAfterYearFive
Total $ 751,279us-gaap_TimeDeposits