Federal Funds Purchased - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Financial_Institution	Dec. 31, 2012
Federal Funds Purchased And Securities Sold Under Agreements To Repurchase [Abstract]
Outstanding federal funds purchased balances	$ 0	$ 0
Lines of credit with FHLB, Total	103.3
Lines of credit Federal Reserve	18.6
Number of financial institutions	3
Line of credit agreements with financial institutions	$ 35.0
Lines credit interest rate from	0.28%
Line credit interest rate to	1.13%