Employee Benefit Plans (Details 4) (Supplemental Executive Retirement Plan (SERP), USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Executive Retirement Plan (SERP)
Amounts relating to the SERP that have been recognized in other comprehensive gain (loss)
Net unrecognized actuarial gain (loss)	$ 3,956	$ (8,464)	$ 773
Net unrecognized prior service cost	827	827	(824)
Total	4,783	(7,637)	(51)
Tax	(1,688)	2,807	44
Total, net of tax	3,095	(4,830)	(7)
Accumulated other comprehensive income (loss) that have not yet been recognized as a component of net periodic pension cost
Net unrecognized actuarial loss	7,803	11,758	3,295
Net unrecognized prior service cost	5,698	6,525	7,352
Total	13,501	18,283	10,647
Tax	(5,074)	(6,743)	(3,936)
Total, net of tax	8,427	11,540	6,711
Amounts included in accumulated other comprehensive income expected to be recognized as components of net periodic pension expense
Amortization of prior service cost	827
Amortization of net actuarial loss	333
Total	$ 1,160