OTHER EQUITY SECURITIES - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Schedule Of Other Assets [Line Items]
Capital stock par value	$ 100
Book value of investment in FHLB stock	$ 25.5		$ 25.5
Dividend income from FHLB stock	0.3	0.3
Carrying value of other equity security	$ 0.7	$ 0.3