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Other short-term borrowings (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Short-term Debt [Line Items]    
Advances with the FHLB paying interest at maturity $ 20,000us-gaap_FederalHomeLoanBankAdvancesShortTerm $ 400,000us-gaap_FederalHomeLoanBankAdvancesShortTerm
Others 1,200us-gaap_OtherBorrowings 1,200us-gaap_OtherBorrowings
Total other short-term borrowings $ 21,200us-gaap_OtherShortTermBorrowings $ 401,200us-gaap_OtherShortTermBorrowings