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Securities - Company's Book Value of Pledged Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Pledged Financial Instruments Not Separately Reported Securities Pledged By Type Of Security [Abstract]  
Book value of pledged securities $ 482,193us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged