Short-Term Borrowings - Summary of Short-Term Borrowings (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Line of Credit Facility [Line Items]
Total short-term borrowings	$ 8,425	$ 21,800
FNBB [Member]
Line of Credit Facility [Line Items]
Total short-term borrowings	$ 8,425	$ 21,800