Derivative Instruments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Interest Rate Swap [Member]	Dec. 31, 2011 Interest Rate Swap [Member]	Sep. 30, 2012 CF Bank [Member]	Dec. 31, 2011 CF Bank [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount					$ 7,802	$ 7,949	$ 7,802	$ 7,949
Interest-rate swaps					1,480
Fair value of interest-rate swaps					(1,054)	(999)
Net gain/loss recognised of fair value of yield maintenance provisions	$ 0	$ 0	$ 0	$ 0