Stock Incentive Plans (Details) (USD $)	1 Months Ended	12 Months Ended		12 Months Ended							1 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended			1 Months Ended			12 Months Ended	1 Months Ended					12 Months Ended	1 Months Ended
	Feb. 28, 2011	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2012 The 1995 Plan [Member]	Dec. 31, 2012 The 2005 Plan [Member]	Dec. 31, 2012 The 2005 Plan [Member] Stock Options [Member]	Dec. 31, 2011 The 2005 Plan [Member] Stock Options [Member]	Dec. 31, 2010 The 2005 Plan [Member] Stock Options [Member]	Dec. 31, 2012 The 2005 Plan [Member] Stock Options [Member] Maximum [Member]	Dec. 31, 2012 The 2005 Plan [Member] Stock Options [Member] Management Shares [Member]	Sep. 30, 2007 The 2005 Plan [Member] Performance Shares [Member]	Dec. 31, 2012 The 2005 Plan [Member] Performance Shares [Member]	Dec. 31, 2012 The 2005 Plan [Member] Performance Shares [Member] Management Shares [Member]	Dec. 31, 2011 The 2005 Plan [Member] Performance Shares [Member] Management Shares [Member]	Sep. 30, 2007 The 2005 Plan [Member] Performance Shares [Member] Employee Shares [Member]	Dec. 31, 2012 The 2005 Plan [Member] Performance Shares [Member] Employee Shares [Member]	Sep. 30, 2007 The 2005 Plan [Member] Performance Shares [Member] Directors and Senior Management [Member]	Dec. 31, 2012 The 2005 Plan [Member] Non Vested Shares [Member]	Dec. 31, 2011 The 2005 Plan [Member] Non Vested Shares [Member]	Dec. 31, 2010 The 2005 Plan [Member] Non Vested Shares [Member]	Feb. 29, 2012 The 2005 Plan [Member] Non Vested Shares [Member] Management Shares [Member]	Feb. 28, 2011 The 2005 Plan [Member] Non Vested Shares [Member] Management Shares [Member]	Jun. 30, 2010 The 2005 Plan [Member] Non Vested Shares [Member] Management Shares [Member]	Dec. 31, 2012 The 2005 Plan [Member] Non Vested Shares [Member] Management Shares [Member]	May 31, 2012 The 2005 Plan [Member] Non Vested Shares [Member] Employee Shares [Member]	Apr. 30, 2011 The 2005 Plan [Member] Non Vested Shares [Member] Employee Shares [Member]	Feb. 29, 2012 The 2005 Plan [Member] Non Vested Shares [Member] Non Employee Director Shares [Member]	Feb. 28, 2011 The 2005 Plan [Member] Non Vested Shares [Member] Non Employee Director Shares [Member]	Jun. 30, 2010 The 2005 Plan [Member] Non Vested Shares [Member] Non Employee Director Shares [Member]	Dec. 31, 2012 The 2005 Plan [Member] Non Vested Shares [Member] Non Employee Director Shares [Member]	Jun. 30, 2010 The 2005 Plan [Member] Non Vested Shares [Member] Directors and Senior Management [Member]
Share-based Payment Award [Line Items]
Number of Stock Incentive Plans		2
Number of shares authorized for issuance (in shares)				1,440,000	1,440,000							68,130
Life of award				10 year	10 year				tenyear
Stock options annual vesting percentage (in hundredths)										25.00%
Fair Value Assumptions [Abstract]
Dividend rate (in hundredths)						3.05%	1.99%	1.90%					1.50%			1.50%
Risk free interest rate (in hundredths)						1.22%	2.73%	2.45%					4.44%			4.38%
Expected lives of options						6 years 3 months	6 years 3 months	6 years 3 months					5 years 9 months 22 days			5 years 4 months 17 days
Price volatility (in hundredths)						38.80%	38.45%	39.48%					34.00%			34.00%
Derived Values [Abstract]
Fair value per share (in dollars per share)													$ 13.20			$ 12.20
Share-based Compensation Expense						$ 561,000	$ 601,000	$ 501,000										$ 1,300,000	$ 1,100,000	$ 300,000
Share based compensation income tax benefit						129,000	80,000	35,000										300,000	400,000	100,000
Compensation cost related to non-vested						500,000												1,000,000
Weighted-average period (in years)						3 years 7 months 6 days												2 years
Options, Outstanding [Roll Forward]
Outstanding at beginning of year (in shares)		503,000	435,000			406,894	341,108	338,482
Granted (in shares)						151,522	81,343	69,222
Cancelled (in shares)						(8,728)	(10,557)	(7,381)
Exercised (in shares)						(55,000)	(5,000)	(59,215)
Outstanding at end of period (in shares)		661,000	435,000			494,688	406,894	341,108
Options, weighted average grant price per option [Roll Forward]
Outstanding at beginning of year (in dollars per share)						$ 19.16	$ 19.69	$ 18.79
Granted (in dollars per share)						$ 10.82	$ 16.58	$ 16.50
Cancelled (in dollars per share)						$ 25.26	$ 21.87	$ 25.26
Exercised (in dollars per share)						$ 7.34	$ 7.34	$ 10.10
Outstanding at end of period (in dollars per share)						$ 17.82	$ 19.16	$ 19.69
Options, Additional Disclosures [Abstract]
Fair value per option (in dollars per share)						$ 3.02	$ 5.62	$ 5.70
Intrinsic value of outstanding options						700,000
Weighted average remaining contractual life						6 years 3 months 18 days
Number of options exercisable (in shares)						173,025
Weighted average exercise price, options exercisable (in dollars per share)						$ 21.72
Intrinsic value, options exercisable						0
Options exercisable, weighted average remaining contractual term						4 years 10 months 24 days
Share Price (in dollars per share)						$ 15.31
Fair value of options vested						600,000
Intrinsic value of options exercised						600,000
Proceeds from stock options exercised						400,000
Tax benefit realized from exercise of stock options						100,000
Compensation, nonvested awards, compensation cost not yet recognized						500,000												1,000,000
Compensation, nonvested awards, cost not yet recognized, period for recognition						3 years 7 months 6 days												2 years
Nonvested Shares [Roll Forward]
Nonvested number, at beginning of year (in shares)																		147,143	94,100	55,946
Granted (in shares)															44,726		23,404	119,354	78,707	41,415	66,384	54,075	34,142		38,186	16,184	14,784	8,448	7,272
Cancelled (in shares)																		(8,098)	(6,733)	(3,261)
Vested and issued (in shares)																		(45,045)	(18,931)	0					(14,040)	(8,159)
Nonvested number at end of year (in shares)																		213,354	147,143	94,100
Stock Awards Additional Disclosures [Abstract]
Period Stock Awards Can Vest													30 days
Fair value per share (in dollars per share)											$ 20.50										$ 10.82	$ 16.58	$ 16.50		$ 10.51	$ 18.06					$ 16.50
Premium on grant date fair value (in dollars per share)												$ 1.64
Estimated expected forfeitures (in hundredths)													40.00%			35.00%
Estimated forfeiture rate of awards (in hundredths)														15.00%
Additional compensation expense														$ 48,000
Number of employees participating in grants of non vested shares	17																				18		16
Share based awards vesting annually (in hundredths)																								25.00%						33.00%
Award vesting period		4 years