Employee Benefits (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Employee Stock Ownership Plan and Trust (ESOP) [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Additional shares contributed to ESOP (in shares)	58,570
Shares released from trust (in shares)	58,600
Total remaining balance of shares in the ESOP (in shares)	400
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 41,000	$ 45,000
Interest cost	65,000	59,000
Amortization of prior service cost	0	7,000
Actuarial net loss	57,000	174,000
Net periodic benefit cost (credit)	163,000	285,000
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	1,000
Interest cost	8,000	9,000
Amortization of prior service cost	(754,000)	(1,087,000)
Actuarial net loss	535,000	611,000
Net periodic benefit cost (credit)	(211,000)	(466,000)
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Contributions by employer on behalf of employees	200,000
Estimated future employer contributions in current fiscal year	2,100,000
Supplemental Executive Retirement Plan [Member]
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employer discretionary contribution amount		$ 400,000