Stock and Incentive Compensation Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Compensation expense - Stock and Incentive plans [Abstract]
Compensation expense - Stock and Incentive plans	$ 1,055	$ 976	$ 3,290	$ 2,850
Performance Awards [Member]
Shares [Roll Forward]
Outstanding/Nonvested shares or units, beginning of period (in shares)	184,133		160,520
Granted (in shares)			73,726
Exercised or released from restriction (in shares)			(38,580)
Forfeited (in shares)	0		(11,533)
Outstanding/Nonvested shares or units, end of period (in shares)	184,133		184,133
Compensation expense - Stock and Incentive plans [Abstract]
Compensation expense - Stock and Incentive plans	267	222	797	620
Time-Vested Awards [Member]
Shares [Roll Forward]
Outstanding/Nonvested shares or units, beginning of period (in shares)	331,183		291,634
Granted (in shares)			104,190
Exercised or released from restriction (in shares)			(60,706)
Forfeited (in shares)	(1,249)		(5,184)
Outstanding/Nonvested shares or units, end of period (in shares)	329,934		329,934
Compensation expense - Stock and Incentive plans [Abstract]
Compensation expense - Stock and Incentive plans	$ 788	$ 754	$ 2,493	$ 2,230
Restricted Stock [Member] | Performance Awards Includes Achievement Shares For Grants After 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Restricted Stock [Member] | Achievement Shares From Performance Grants Prior To 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Restricted Stock [Member] | Time-Vested Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ROATE Performance measure (in hundredths)			100.00%
TSR Performance measure (in hundredths)			100.00%
Stock Option-Based Awards [Member]
Options [Roll Forward]
Outstanding/Nonvested shares, beginning of period (in shares)	0		105,450
Granted (in shares)			0
Exercised or released from restriction (in shares)			0
Expired (in shares)			(105,450)
Forfeited (in shares)	0		0
Outstanding/Nonvested shares, end of period (in shares)	0		0
2005 Stock and Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			5 years
Stock and incentive compensation plan, contractual term			7 years
1997 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years
Stock and incentive compensation plan, contractual term			10 years