Retirement Plans - Change in Benefit Obligations and Plan Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension plan
Change in benefit obligation - Pension
Benefit obligation at beginning of year	$ 10,215	$ 8,701
Service cost	359	284	251
Interest cost	402	375	384
Actuarial gain/assumption changes	(1,379)	1,344
Benefits paid	(271)	(489)
Benefit obligation at end of year	9,326	10,215	8,701
Accumulated benefit obligation at end of year	8,427	9,195
Change in Plan Assets
Fair value of plan assets at beginning of year	6,799	5,722
Actual return on plan assets	1,105	706
Employer contribution	1,000	860
Benefits/expenses paid	(271)	(489)
Fair value of plan assets at end of year	8,633	6,799	5,722
Funded status - liability	(693)	(3,416)
Amounts recorded in stockholders’ equity
Net actuarial (gain) loss	(1,961)	(4,110)
Prior service cost	148	176
Total amount recorded	(1,813)	(3,934)
Amount recorded, net taxes	(1,088)	(2,360)
SERP
Change in benefit obligation - Pension
Benefit obligation at beginning of year	6,507	5,474
Service cost	318	525	(172)
Interest cost	219	208	(215)
Actuarial gain/assumption changes	(913)	300
Benefit obligation at end of year	6,131	6,507	5,474
Accumulated benefit obligation at end of year	6,099	6,339
Change in Plan Assets
Funded status - liability	(6,131)	(6,507)
Amounts recorded in stockholders’ equity
Net actuarial (gain) loss	696	1,671
Prior service cost	0	0
Total amount recorded	696	1,671
Amount recorded, net taxes	$ 418	$ 1,003