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Employee Benefit Plans (Details Textual) (USD $)	6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
Employee Benefit Plans (Details Textual) (USD $)	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Chesapeake Pension Plan [Member]	Jun. 30, 2012 Chesapeake Pension Plan [Member]	Jun. 30, 2012 FPU Pension Plan [Member]	Jun. 30, 2012 FPU Pension Plan [Member]	Jun. 30, 2012 Chesapeake Pension SERP [Member]	Jun. 30, 2012 Chesapeake Pension SERP [Member]	Jun. 30, 2012 Chesapeake Postretirement Plan [Member]	Jun. 30, 2012 Chesapeake Postretirement Plan [Member]	Jun. 30, 2012 FPU Medical Plan [Member]	Jun. 30, 2012 FPU Medical Plan [Member]
Employee Benefit Plans (Textual) [Abstract]
Expected pension and postretirement benefit costs	$ 1,900,000
Expected amortization of pre merger regulatory asset						769,000
Unamortized balance of regulatory asset	5,500,000	5,900,000
Contribution to pension plan			110,000	273,000	413,000	705,000	22,000	45,000	28,000	40,000	100,000	158,000
Additional contribution to pension plan			1,300,000	1,300,000	2,000,000	2,000,000	88,000	88,000	87,000	87,000	193,000	193,000
Period of Average for corporate bond rate to measure pension obligations for pension funding purposes	25 years
Estimated reduction of employer discretionary contributions to pension plans				$ 915,000		$ 1,200,000