OTHER EQUITY SECURITIES - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Schedule Of Other Assets [Line Items]
Capital stock par value	$ 100		$ 100
Book value of investment in FHLB stock	$ 25.5		$ 25.5		$ 28.4
Dividend income from FHLB stock	0.3	0.3	0.9	1.0
Carrying value of other equity security	$ 0.3		$ 0.3		$ 0.3