Retirement Plans - Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Pension plan
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Net (gain) loss	$ (1,867)	$ (1,092)
Recognition of net actuarial gain or (loss)	(282)	218
Recognized prior service cost	28	(29)
Total changes	(2,121)	(903)
Changes, net of taxes	(1,271)	(542)
SERP
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Net (gain) loss	(745)	133
Recognition of net actuarial gain or (loss)	(229)	(287)
Recognized prior service cost	0	0
Total changes	(974)	(154)
Changes, net of taxes	$ (584)	$ (92)

Before tax amount of the income statement impact of the reclassification adjustment for prior service costs recognized as a component of net period benefit cost.

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