OTHER EQUITY SECURITIES - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Schedule Of Other Assets [Line Items]
Capital stock par value	$ 100
Book value of investment in FHLB stock	$ 31.3		$ 31.3
Dividend income from FHLB stock	0.3	$ 0.3
Carrying value of other equity security	$ 1.0		$ 0.9