Compensation Programs (Schedule Of Service-Based Stock Awards) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Fair Value Per Share	$ 11.99
Total Original Grants	174,399
Remaining Shares Vesting in Period	114,097
2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Fair Value Per Share	$ 12.93
Total Original Grants	156,000
Vested	98,507
Forfeited	12,499
2008 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Fair Value Per Share	$ 12.87
Total Original Grants	6,000
Vested	6,000
Forfeited
2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Fair Value Per Share	$ 11.39
Total Original Grants	6,000
Vested	6,000
Forfeited
2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Fair Value Per Share	$ 11.64
Total Original Grants	12,000
Vested	12,000
Forfeited
2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Fair Value Per Share	$ 13.23
Total Original Grants	24,000
Vested	24,000
Forfeited
2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Fair Value Per Share	$ 13.59
Total Original Grants	29,000
Vested
Forfeited
Remaining Shares Vesting In: 2013 [Member] | 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period	22,497	[1]
Remaining Shares Vesting In: 2013 [Member] | 2008 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period		[1]
Remaining Shares Vesting In: 2013 [Member] | 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period		[1]
Remaining Shares Vesting In: 2013 [Member] | 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period		[1]
Remaining Shares Vesting In: 2013 [Member] | 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period		[1]
Remaining Shares Vesting In: 2013 [Member] | 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period	29,000	[1]
Remaining Shares Vesting In: 2014 [Member] | 2007 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period	22,497
Remaining Shares Vesting In: 2014 [Member] | 2008 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period
Remaining Shares Vesting In: 2014 [Member] | 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period
Remaining Shares Vesting In: 2014 [Member] | 2010 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period
Remaining Shares Vesting In: 2014 [Member] | 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period
Remaining Shares Vesting In: 2014 [Member] | 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Shares Vesting in Period

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