Employee Benefit Plans (Details 9b) (Other Benefits Plan, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair Value of plan assets, Ending Balance	$ 20,408	$ 15,817	$ 12,890
Fair Value, Level 1 | Mutual Funds - Small Cap Core
Fair Value of plan assets, Ending Balance	97	90
Fair Value, Level 1 | Mutual Funds - Mid Cap Core
Fair Value of plan assets, Ending Balance	104	48
Fair Value, Level 1 | Mutual Funds - Mid Cap Growth
Fair Value of plan assets, Ending Balance	290	253
Fair Value, Level 1 | Mutual Funds - Mid Cap Value
Fair Value of plan assets, Ending Balance	446	288
Fair Value, Level 1 | Mutual Funds - Large Cap Core
Fair Value of plan assets, Ending Balance	5,270	3,406
Fair Value, Level 1 | Mutual Funds - Large Cap Growth
Fair Value of plan assets, Ending Balance	902	398
Fair Value, Level 1 | Mutual Funds - Large Cap Value
Fair Value of plan assets, Ending Balance		349
Fair Value, Level 1 | Mutual Funds - Foreign Small Mid Growth
Fair Value of plan assets, Ending Balance	303	225
Fair Value, Level 1 | Mutual Funds - Foreign Large Core
Fair Value of plan assets, Ending Balance	234	279
Fair Value, Level 1 | Mutual Funds - Foreign Large Growth
Fair Value of plan assets, Ending Balance	292	247
Fair Value, Level 1 | Mutual Funds - Diversied Emerging Markets
Fair Value of plan assets, Ending Balance	282	163
Fair Value, Level 1 | Mutual Funds - Preferred Stock Index
Fair Value of plan assets, Ending Balance	119	107
Fair Value, Level 1 | Agency/US/State/Municipal Debt
Fair Value of plan assets, Ending Balance	780	424
Fair Value, Level 1 | CommoditiesMember
Fair Value of plan assets, Ending Balance	170	100
Fair Value, Level 1 | Investments
Fair Value of plan assets, Ending Balance	9,289	6,377
Fair Value, Total | Mutual Funds - Small Cap Core
Fair Value of plan assets, Ending Balance	97	90
Fair Value, Total | Mutual Funds - Mid Cap Core
Fair Value of plan assets, Ending Balance	104	48
Fair Value, Total | Mutual Funds - Mid Cap Growth
Fair Value of plan assets, Ending Balance	290	253
Fair Value, Total | Mutual Funds - Mid Cap Value
Fair Value of plan assets, Ending Balance	446	288
Fair Value, Total | Mutual Funds - Large Cap Core
Fair Value of plan assets, Ending Balance	5,270	3,406
Fair Value, Total | Mutual Funds - Large Cap Growth
Fair Value of plan assets, Ending Balance	902	398
Fair Value, Total | Mutual Funds - Large Cap Value
Fair Value of plan assets, Ending Balance		349
Fair Value, Total | Mutual Funds - Foreign Small Mid Growth
Fair Value of plan assets, Ending Balance	303	225
Fair Value, Total | Mutual Funds - Foreign Large Core
Fair Value of plan assets, Ending Balance	234	279
Fair Value, Total | Mutual Funds - Foreign Large Growth
Fair Value of plan assets, Ending Balance	292	247
Fair Value, Total | Mutual Funds - Diversied Emerging Markets
Fair Value of plan assets, Ending Balance	282	163
Fair Value, Total | Mutual Funds - Preferred Stock Index
Fair Value of plan assets, Ending Balance	119	107
Fair Value, Total | Money Market Funds - Cash and Cash Equivalents
Fair Value of plan assets, Ending Balance	1,205	81
Fair Value, Total | Agency/US/State/Municipal Debt
Fair Value of plan assets, Ending Balance	10,694	9,046
Fair Value, Total | CommoditiesMember
Fair Value of plan assets, Ending Balance	170	100
Fair Value, Total | Investments
Fair Value of plan assets, Ending Balance	20,408	15,817
Fair Value, Level 2 | Money Market Funds - Cash and Cash Equivalents
Fair Value of plan assets, Ending Balance	1,205	818
Fair Value, Level 2 | Agency/US/State/Municipal Debt
Fair Value of plan assets, Ending Balance	9,914	8,622
Fair Value, Level 2 | Investments
Fair Value of plan assets, Ending Balance	$ 11,119	$ 9,440