OTHER EQUITY SECURITIES - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Schedule Of Other Assets [Line Items]
Capital stock par value	$ 100		$ 100
Book value of investment in FHLB stock	$ 26.6		$ 26.6		$ 31.3
Dividend income from FHLB stock	0.4	$ 0.3	1.1	$ 0.8
Carrying value of other equity security	$ 2.1		$ 2.1		$ 0.9