Stock Incentive Plans (Details) $ / shares in Units, $ in Thousands	1 Months Ended								12 Months Ended
	Sep. 30, 2015 USD ($) shares	May. 31, 2015 $ / shares shares	Feb. 28, 2015 Employee Company $ / shares shares	May. 31, 2014 $ / shares shares	Feb. 28, 2014 Employee $ / shares shares	May. 31, 2013 $ / shares shares	Feb. 28, 2013 Employee $ / shares shares	Sep. 30, 2007 $ / shares shares	Dec. 31, 2015 USD ($) Plan $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares	Dec. 31, 2011 USD ($)
Share-based Payment Award [Line Items]
Number of stock incentive plans | Plan									2
Options, Outstanding [Roll Forward]
Outstanding at beginning of year (in shares)									1,394,000	1,496,000
Outstanding at end of period (in shares)									1,312,000	1,394,000	1,496,000
The 2005 Plan [Member]
Share-based Payment Award [Line Items]
Number of shares authorized for issuance (in shares)									2,880,000
Additional number of shares authorized for issuance (in shares)									3,000,000
Life of award									P10Y
The 2005 Plan [Member] | Stock Options [Member]
Fair Value Assumptions [Abstract]
Share price (in dollars per share) | $ / shares									$ 21.53
Dividend rate											2.38%
Risk free interest rate											1.15%
Expected lives of options											6 years 1 month 20 days
Price volatility											40.66%
Share-based compensation expense | $									$ 142	$ 452	$ 612
Share based compensation income tax benefit | $									29	$ 78	$ 134
Compensation cost related to non-vested | $									$ 100
Weighted-average period									2 years
Options, Outstanding [Roll Forward]
Outstanding at beginning of year (in shares)									997,352	1,101,014	989,376
Granted (in shares)									0	0	266,096
Cancelled (in shares)									(6,252)	(2,146)	(21,182)
Exercised (in shares)									(86,942)	(101,516)	(133,276)
Outstanding at end of period (in shares)									904,158	997,352	1,101,014
Options, weighted average grant price per option [Roll Forward]
Outstanding at beginning of year (in dollars per share) | $ / shares									$ 8.05	$ 8.35	$ 8.91
Granted (in dollars per share) | $ / shares									0	0	6.92
Cancelled (in dollars per share) | $ / shares									12.63	12.63	12.63
Exercised (in dollars per share) | $ / shares									11.46	11.21	8.41
Outstanding at end of period (in dollars per share) | $ / shares									$ 7.70	$ 8.05	8.35
Options, Additional Disclosures [Abstract]
Fair value per option (in dollars per share) | $ / shares											$ 2.16
Intrinsic value of outstanding options | $									$ 12,500
Weighted average remaining contractual life									5 years 2 months 12 days
Number of options exercisable (in shares)									665,340
Weighted average exercise price, options exercisable (in dollars per share) | $ / shares									$ 8.15
Intrinsic value, options exercisable | $									$ 8,900
Options exercisable, weighted average remaining contractual term									4 years 7 months 6 days
Fair value of options vested | $									$ 300
Intrinsic value of options exercised | $									700
Proceeds from stock options exercised | $									1,000
Tax benefit realized from exercise of stock options | $									200
Compensation, nonvested awards, compensation cost not yet recognized | $									$ 100
Compensation, nonvested awards, cost not yet recognized, period for recognition									2 years
The 2005 Plan [Member] | Stock Options [Member] | Management Shares [Member]
Share-based Payment Award [Line Items]
Stock options annual vesting percentage											25.00%
The 2005 Plan [Member] | Stock Options [Member] | Management Shares [Member] | Maximum [Member]
Share-based Payment Award [Line Items]
Life of award											P10Y
The 2005 Plan [Member] | Stock Options [Member] | Officer [Member]
Share-based Payment Award [Line Items]
Stock options annual vesting percentage											25.00%
The 2005 Plan [Member] | Stock Options [Member] | Officer [Member] | Maximum [Member]
Share-based Payment Award [Line Items]
Life of award											P7Y
The 2005 Plan [Member] | Performance Shares [Member]
Share-based Payment Award [Line Items]
Number of shares authorized for issuance (in shares)								136,260
Stock Awards Additional Disclosures [Abstract]
Fair value per share (in dollars per share) | $ / shares								$ 10.25
Premium on grant date fair value (in dollars per share) | $ / shares									$ 0.82
The 2005 Plan [Member] | Performance Shares [Member] | Management Shares [Member]
Fair Value Assumptions [Abstract]
Share-based compensation expense | $	$ 37
Nonvested Shares [Roll Forward]
Vested and issued (in shares)	(37,826)
Stock Awards Additional Disclosures [Abstract]
Period stock awards can vest								30 days
Estimated expected forfeitures									40.00%
Estimated forfeiture rate of awards												15.00%
Additional compensation expense | $												$ 48
The 2005 Plan [Member] | Performance Shares [Member] | Directors and Senior Management [Member]
Nonvested Shares [Roll Forward]
Granted (in shares)								46,808
The 2005 Plan [Member] | Performance Shares [Member] | Employee Shares [Member]
Nonvested Shares [Roll Forward]
Granted (in shares)								89,452
Stock Awards Additional Disclosures [Abstract]
Estimated expected forfeitures									35.00%		39.00%
Additional compensation expense | $											$ 40
The 2005 Plan [Member] | Non Vested Shares [Member]
Fair Value Assumptions [Abstract]
Share price (in dollars per share) | $ / shares									$ 15.01
Dividend rate									1.57%
Risk free interest rate									0.95%
Expected lives of options									2 years 10 months 13 days
Share-based compensation expense | $									$ 2,600	$ 2,200	1,300
Share based compensation income tax benefit | $									1,300	$ 900	$ 500
Compensation cost related to non-vested | $									$ 1,500
Weighted-average period									2 years
Options, Additional Disclosures [Abstract]
Compensation, nonvested awards, compensation cost not yet recognized | $									$ 1,500
Compensation, nonvested awards, cost not yet recognized, period for recognition									2 years
Nonvested Shares [Roll Forward]
Nonvested number, at beginning of year (in shares)									435,272	426,180	426,708
Granted (in shares)									190,258	181,530	197,372
Cancelled (in shares)									(6,736)	(10,764)	(61,988)
Vested and issued (in shares)									(211,498)	(161,674)	(135,912)
Nonvested number at end of year (in shares)									407,296	435,272	426,180
The 2005 Plan [Member] | Non Vested Shares [Member] | US Treasury Rate [Member] | Minimum [Member]
Fair Value Assumptions [Abstract]
Expected lives of options									2 years
The 2005 Plan [Member] | Non Vested Shares [Member] | US Treasury Rate [Member] | Maximum [Member]
Fair Value Assumptions [Abstract]
Expected lives of options									3 years
The 2005 Plan [Member] | Non Vested Shares [Member] | Management Shares [Member]
Share-based Payment Award [Line Items]
Stock options annual vesting percentage									25.00%	25.00%	25.00%
Nonvested Shares [Roll Forward]
Granted (in shares)			79,946		135,562		124,566
Stock Awards Additional Disclosures [Abstract]
Fair value per share (in dollars per share) | $ / shares			$ 15.01		$ 13.00		$ 6.92
Number of employees participating in grants of non vested shares | Employee			21		22		18
Number of years of service with the company									10 years
The 2005 Plan [Member] | Non Vested Shares [Member] | Employee Shares [Member]
Nonvested Shares [Roll Forward]
Granted (in shares)		29,752		33,664		49,686
Vested and issued (in shares)		(10,180)		(9,390)		(19,134)
Stock Awards Additional Disclosures [Abstract]
Fair value per share (in dollars per share) | $ / shares		$ 17.23		$ 12.83		$ 8.74
Number of years of service with the company									10 years
Vested period for remaining shares									4 years
The 2005 Plan [Member] | Non Vested Shares [Member] | Non Employee Director Shares [Member]
Share-based Payment Award [Line Items]
Stock options annual vesting percentage										33.00%	33.00%
Nonvested Shares [Roll Forward]
Granted (in shares)			31,984		12,304		23,120
Stock Awards Additional Disclosures [Abstract]
Fair value per share (in dollars per share) | $ / shares			$ 15.01		$ 13.00		$ 6.92
The 2005 Plan [Member] | Non Vested Shares [Member] | Eight Management Employees [Member]
Share-based Payment Award [Line Items]
Life of award			3
Nonvested Shares [Roll Forward]
Granted (in shares)			48,576
Stock Awards Additional Disclosures [Abstract]
Fair value per share (in dollars per share) | $ / shares			$ 15.66
Number of employees participating in grants of non vested shares | Employee			8
Maximum percentage for granted share units			150.00%
Number of peer companies | Company			38
The 2005 Plan [Member] | Non Vested Shares [Member] | Eight Management Employees [Member] | Minimum [Member]
Nonvested Shares [Roll Forward]
Granted (in shares)			0
The 2005 Plan [Member] | Non Vested Shares [Member] | Eight Management Employees [Member] | Maximum [Member]
Nonvested Shares [Roll Forward]
Granted (in shares)			72,858