Components of Net Periodic Benefit Cost (Details Textual) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Defined Benefits Plan Estimated Future Employer Contributions In Next Fiscal Year		$ 2,100,000
Expected contribution to ESOP		550,000
Defined Contribution Plan Employer Accrued Discretionary Contribution Amount	1,100,000
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions made by employer	1,500,000
Post-Retirement Health Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions made by employer	156,000
Expected contribution to ESOP		$ 234,000