Other Borrowings - Summary of Balances of Other Borrowings (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total other borrowings	$ 12,665	$ 6,335
Other collateralized borrowings, fixed rate, as of September 30, 2014 of 0.05%, payable on October 1, 2014 [Member]
Debt Instrument [Line Items]
Other collateralized borrowings, fixed rate, as of September 30, 2014 of 0.05%, payable on October 1, 2014	$ 12,665	$ 6,335