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STOCK-BASED COMPENSATION - Restricted Stock - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Omnibus Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted shares of restricted stock				407,886
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period				11,000
Omnibus Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation cost	$ 0.8	$ 1.0		$ 2.7	$ 3.0
Stock based compensation expense unrecognized related to nonvested shares of restricted stock	$ 2.9			$ 2.9
Period for cost recognition not yet recognized				1 year 4 months 24 days
Omnibus Plan [Member] | Restricted Stock [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted shares of restricted stock				65,447	140,360
Restricted stock lapse, maximum				1 year	1 year
Omnibus Plan [Member] | Restricted Stock [Member] | Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted shares of restricted stock				342,439	951,332
Restricted stock lapse, maximum					2 years
Retirement Eligible Shares				20,447
Omnibus Plan [Member] | Restricted Stock [Member] | Restricted stock vesting after two years [Member] | Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting percentage				50.00%
Omnibus Plan [Member] | Restricted Stock [Member] | Restricted stock vesting after three years [Member] | Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock vesting percentage				50.00%
Troubled Asset Relief Program [Member] | Restricted Stock [Member] | Senior Officers [Member] | Government [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted shares of restricted stock			838,332

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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