COMPENSATION PROGRAMS - Schedule of Restricted Stock Awards (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012
Equity instruments other than options, nonvested, number of shares [Roll Forward]
Unvested stock awards outstanding at beginning of period (in shares)			657,720
Grants (in shares)			28,000
Vestings (in shares)			(172,523)
Forfeitures (in shares)			(19,969)
Unvested stock awards outstanding at end of period (in shares)	493,228		493,228
Equity instruments other than options, nonvested, weighted average grant date fair value [Abstract]
Unvested stock awards outstanding at beginning of period (in dollars per share)			$ 12.48
Grants (in dollars per share)			$ 13.02
Vestings (in dollars per share)			$ 12.41
Forfeitures (in dollars per share)			$ 12.65
Unvested stock awards outstanding at end of period (in dollars per share)	$ 12.53		$ 12.53
Salaries and benefits	$ 1,689,000	$ 1,696,000	$ 4,857,000		$ 5,205,000
Common stock dividend payable	30,662,000		30,662,000			29,512,000
Year 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share (in dollars per share)			$ 12.93
Total original grants (in shares)			156,000
Vested			121,004
Forfeited			12,832
Year 2007 [Member] | Remaining Shares Vesting In: 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			22,497	[1]
Year 2007 [Member] | Remaining Shares Vesting In: 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			22,164
Year 2008 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share (in dollars per share)			$ 12.87
Total original grants (in shares)			6,000
Vested			6,000
Forfeited			0
Year 2008 [Member] | Remaining Shares Vesting In: 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0	[1]
Year 2008 [Member] | Remaining Shares Vesting In: 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0
Year 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share (in dollars per share)			$ 11.39
Total original grants (in shares)			6,000
Vested			6,000
Forfeited			0
Year 2009 [Member] | Remaining Shares Vesting In: 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0	[1]
Year 2009 [Member] | Remaining Shares Vesting In: 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0
Year 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share (in dollars per share)			$ 11.64
Total original grants (in shares)			12,000
Vested			12,000
Forfeited			0
Year 2010 [Member] | Remaining Shares Vesting In: 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0	[1]
Year 2010 [Member] | Remaining Shares Vesting In: 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0
Year 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share (in dollars per share)			$ 13.23
Total original grants (in shares)			24,000
Vested			24,000
Forfeited			0
Year 2011 [Member] | Remaining Shares Vesting In: 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0	[1]
Year 2011 [Member] | Remaining Shares Vesting In: 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0
Year 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share (in dollars per share)			$ 13.59
Total original grants (in shares)			29,000
Vested			29,000
Forfeited			0
Year 2012 [Member] | Remaining Shares Vesting In: 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			29,000	[1]
Year 2012 [Member] | Remaining Shares Vesting In: 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0
Year 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share (in dollars per share)			$ 13.02
Total original grants (in shares)			28,000
Vested			0
Forfeited			0
Year 2013 [Member] | Remaining Shares Vesting In: 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0	[1]
Year 2013 [Member] | Remaining Shares Vesting In: 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			28,000
Performance-Based Stock Awards [Member] | Year 2008 [Member] | December 31 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share (in dollars per share)			$ 10.18
Total original grants (in shares)			140,658	[2]
Performance-Based Stock Awards [Member] | Year 2008 [Member] | Remaining Shares Vesting In: 2013 [Member] | December 31 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0
Performance-Based Stock Awards [Member] | Year 2008 [Member] | Remaining Shares Vesting In: 2014 [Member] | December 31 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0
Performance-Based Stock Awards [Member] | Year 2008 [Member] | Remaining Shares Vesting In: 2015 [Member] | December 31 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0
Performance-Based Stock Awards [Member] | Year 2008 [Member] | Remaining Shares Vesting In: 2016 [Member] | December 31 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0
Performance-Based Stock Awards [Member] | Year 2009 [Member] | December 31 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share (in dollars per share)			$ 14.33
Total original grants (in shares)			110,917	[3]
Performance-Based Stock Awards [Member] | Year 2009 [Member] | Remaining Shares Vesting In: 2013 [Member] | December 31 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			52,915
Performance-Based Stock Awards [Member] | Year 2009 [Member] | Remaining Shares Vesting In: 2014 [Member] | December 31 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0
Performance-Based Stock Awards [Member] | Year 2009 [Member] | Remaining Shares Vesting In: 2015 [Member] | December 31 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0
Performance-Based Stock Awards [Member] | Year 2009 [Member] | Remaining Shares Vesting In: 2016 [Member] | December 31 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0
Performance-Based Stock Awards [Member] | Year 2010 [Member] | December 31 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share (in dollars per share)			$ 12.44
Total original grants (in shares)			128,766
Performance-Based Stock Awards [Member] | Year 2010 [Member] | Remaining Shares Vesting In: 2013 [Member] | December 31 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			61,508
Performance-Based Stock Awards [Member] | Year 2010 [Member] | Remaining Shares Vesting In: 2014 [Member] | December 31 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			61,499
Performance-Based Stock Awards [Member] | Year 2010 [Member] | Remaining Shares Vesting In: 2015 [Member] | December 31 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0
Performance-Based Stock Awards [Member] | Year 2010 [Member] | Remaining Shares Vesting In: 2016 [Member] | December 31 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0
Performance-Based Stock Awards [Member] | Year 2011 [Member] | December 31 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share (in dollars per share)			$ 12.72
Total original grants (in shares)			132,490
Performance-Based Stock Awards [Member] | Year 2011 [Member] | Remaining Shares Vesting In: 2013 [Member] | December 31 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0
Performance-Based Stock Awards [Member] | Year 2011 [Member] | Remaining Shares Vesting In: 2014 [Member] | December 31 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			63,722
Performance-Based Stock Awards [Member] | Year 2011 [Member] | Remaining Shares Vesting In: 2015 [Member] | December 31 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			63,718
Performance-Based Stock Awards [Member] | Year 2011 [Member] | Remaining Shares Vesting In: 2016 [Member] | December 31 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0
Performance-Based Stock Awards [Member] | Year 2012 [Member] | December 31 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share (in dollars per share)			$ 11.67
Total original grants (in shares)			145,399
Performance-Based Stock Awards [Member] | Year 2012 [Member] | Remaining Shares Vesting In: 2013 [Member] | December 31 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0
Performance-Based Stock Awards [Member] | Year 2012 [Member] | Remaining Shares Vesting In: 2014 [Member] | December 31 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			0
Performance-Based Stock Awards [Member] | Year 2012 [Member] | Remaining Shares Vesting In: 2015 [Member] | December 31 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			69,853
Performance-Based Stock Awards [Member] | Year 2012 [Member] | Remaining Shares Vesting In: 2016 [Member] | December 31 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining shares vesting in period (in shares)			69,849
Stock Awards Activity [Member]
Equity instruments other than options, nonvested, weighted average grant date fair value [Abstract]
Salaries and benefits	470,000		1,345,000
Other general and administrative expense	92,000		295,000
Common stock dividend payable	1,100,000		1,100,000
Total of Unrecognized compensation expense for unvested stock award	3,100,000		3,100,000
Compensation cost not yet recognized, period for recognition			1 year 2 months 12 days
Other Benefit Programs [Member]
Equity instruments other than options, nonvested, weighted average grant date fair value [Abstract]
Salaries and benefits	$ 119,000		$ 207,000
Performance Based Stock Awards Vesting In Three Year [Member]
Equity instruments other than options, nonvested, number of shares [Roll Forward]
Percentage of performance based awards granted, actual (in hundredths)			50.00%
Performance Based Stock Awards Vesting After Three Year [Member]
Equity instruments other than options, nonvested, number of shares [Roll Forward]
Percentage of performance based awards granted, actual (in hundredths)			50.00%

[1] The 2007 grant shares vested in January 2013 and the 2012 grant shares vested in April 2013.

[2] The performance criteria for the three-year measurement periods ending December 31, 2012 and 2011 were met resulting in the vesting of 67,599 shares associated with the first 50% of this grant in February 2012 and 67,595 shares associated with the second 50% of this grant in January 2013.

[3] The performance criteria for the first three-year measurement period ending December 31, 2012 was met resulting in the January 2013 vesting of 53,431 shares associated with the first 50% of this grant.