Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended								10 Months Ended	12 Months Ended			34 Months Ended
	Dec. 31, 2013 State	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2013 Segment mi State	Dec. 31, 2012	Dec. 31, 2011	Oct. 31, 2013
Summary of Significant Accounting Policies [Abstract]
Number of States in which Entity Operates	5									5
Number of miles of fiber network (in miles)										4,200
Number of business segments										3
Periodic estimated investment on project (in hundredths)										30.00%
Project completion period (in years)										3 years
Capital expenditure incurred													$ 21,096,000
NTIA reimbursements received													14,767,000
Variance of rate from median (in hundredths)										15.00%
Period of adjustment of costs and investments (in years)										2 years
Maximum maturity period for classification as cash equivalents										3 months
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of year				278,000				436,000		278,000	436,000	570,000	570,000
Additions charged to expense										272,000	290,000	299,000
Write-offs										(180,000)	(448,000)	(433,000)
Balance at end of year	370,000				278,000				278,000	370,000	278,000	436,000
Investments [Abstract]
CoBank, ACB Stock	2,357,000				2,180,000				2,180,000	2,357,000	2,180,000
RTFC Subordinated Capital Certificates	842,000				837,000				837,000	842,000	837,000
Other	215,000				196,000				196,000	215,000	196,000
Total investments	3,414,000				3,213,000				3,213,000	3,414,000	3,213,000
Components of property, plant and equipment [Abstract]
Property, plant and equipment, gross	461,712,000				437,623,000				437,623,000	461,712,000	437,623,000
Less: Accumulated depreciation and amortization	(280,386,000)				(254,664,000)				(254,664,000)	(280,386,000)	(254,664,000)
Property, plant and equipment, net	181,326,000				182,959,000				182,959,000	181,326,000	182,959,000	154,254,000
Composite depreciation rate (in hundredths)										3.70%	3.30%	4.10%
Depreciation expense										28,439,000	25,943,000	22,702,000
Capital leases assets, gross	1,041,000				2,405,000				2,405,000	1,041,000	2,405,000
Capital leases assets, accumulated depreciation	(798,000)				(1,994,000)				(1,994,000)	(798,000)	(1,994,000)
Capital leases assets, net	243,000				411,000				411,000	243,000	411,000
Capitalized Computer Software, Net [Abstract]
Capitalized software for internal use, gross	13,578,000				11,578,000				11,578,000	13,578,000	11,578,000	9,976,000
Accumulated amortization	9,969,000				8,515,000				8,515,000	9,969,000	8,515,000	7,579,000
Net capitalized software for internal use	3,609,000				3,063,000				3,063,000	3,609,000	3,063,000	2,397,000
Capitalized cost										2,120,000	1,602,000	755,000
Capitalized software, amortization										1,574,000	936,000	675,000
Impairment or Disposal of Assets Disclosure [Abstract]
Impairment charges										638,000	0	0
Materials and Supplies [Abstract]
Materials and supplies	1,762,000				2,178,000				2,178,000	1,762,000	2,178,000
Post-Retirement Benefits
Minimum percentage of cumulative gains and losses considered for post-retirement benefits (in hundredths)										10.00%
Unrecognized net actuarial loss	5,505,000									5,505,000
Period over which unrecognized net actuarial loss is expected to be amortized										11 years
Defined Benefit Plan, Average Future Service										8 years
Percentage of realization of income tax (in hundredths)										50.00%
Advertising Expense [Abstract]
Advertising expense										1,008,000	871,000	908,000
Accrued Liabilities and Other Liabilities [Abstract]
Accrued incentive compensation	1,792,000				2,005,000				2,005,000	1,792,000	2,005,000
Accrued wages and commissions	3,543,000				2,644,000				2,644,000	3,543,000	2,644,000
Other	5,108,000				6,232,000				6,232,000	5,108,000	6,232,000
Total accrued expense and other	10,443,000				10,881,000				10,881,000	10,443,000	10,881,000
Goodwill [Line Items]
Goodwill	29,028,000				29,028,000				29,028,000	29,028,000	29,028,000
Goodwill tax deductible amount	26,964,000									26,964,000
Earnings per share, basic and diluted [Abstract]
Net Income	1,923,000	1,862,000	2,321,000	1,626,000	2,525,000	1,741,000	1,738,000	2,294,000	939,000	7,732,000	8,298,000	8,401,000
Weighted average shares outstanding (in shares)										13,548,007	13,409,743	13,296,668
Total dilutive shares outstanding (in shares)										13,606,217	13,528,039	13,419,647
Earnings per share [Abstract]
Basic (in dollars per share)										$ 0.57	$ 0.62	$ 0.63
Diluted (in dollars per share)	$ 0.14	$ 0.14	$ 0.17	$ 0.12	$ 0.19	$ 0.13	$ 0.13	$ 0.17	$ 0.07	$ 0.57	$ 0.61	$ 0.63
Dividends per share (in dollars per share)	$ 0.15	$ 0.145	$ 0.145	$ 0.145	$ 0.145	$ 0.14	$ 0.14	$ 0.14		$ 0.585	$ 0.565	$ 0.545
Shares excluded from computation of earnings per share amount (in shares)										44,640	77,150	169,450
Stock acquired and retired (in shares)										124,285	0	36,248
Stock Options (dilutive only) [Member]
Earnings per share, basic and diluted [Abstract]
Effect of dilutive securities (in shares)										7,538	12,254	12,531
Stock Subscribed (ESPP) [Member]
Earnings per share, basic and diluted [Abstract]
Effect of dilutive securities (in shares)										0	2,185	0
Stock Subscribed LTEIP [Member]
Earnings per share, basic and diluted [Abstract]
Effect of dilutive securities (in shares)										24,571	72,441	86,549
Retention Awards [Member]
Earnings per share, basic and diluted [Abstract]
Retention awards (in shares)										26,101	31,416	23,899
Minimum [Member]
Components of property, plant and equipment [Abstract]
Capitalized software. amortized period (in years)										3 years
Maximum [Member]
Components of property, plant and equipment [Abstract]
Capitalized software. amortized period (in years)										10 years
Land [Member]
Components of property, plant and equipment [Abstract]
Property, plant and equipment, gross	1,102,000				1,102,000				1,102,000	1,102,000	1,102,000
Buildings [Member]
Components of property, plant and equipment [Abstract]
Property, plant and equipment, gross	21,180,000				21,142,000				21,142,000	21,180,000	21,142,000
Buildings [Member] | Minimum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives										28 years
Buildings [Member] | Maximum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives										40 years
Leasehold Improvements [Member]
Components of property, plant and equipment [Abstract]
Property, plant and equipment, gross	5,829,000				4,680,000				4,680,000	5,829,000	4,680,000
Leasehold Improvements [Member] | Minimum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives										3 years
Leasehold Improvements [Member] | Maximum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives										39 years
Network and Outside Plant Facilities [Member]
Components of property, plant and equipment [Abstract]
Property, plant and equipment, gross	390,054,000				366,097,000				366,097,000	390,054,000	366,097,000
Network and Outside Plant Facilities [Member] | Minimum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives										3 years
Network and Outside Plant Facilities [Member] | Maximum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives										50 years
Furniture, Fixtures and Equipment [Member]
Components of property, plant and equipment [Abstract]
Property, plant and equipment, gross	40,726,000				37,756,000				37,756,000	40,726,000	37,756,000
Furniture, Fixtures and Equipment [Member] | Minimum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives										3 years
Furniture, Fixtures and Equipment [Member] | Maximum [Member]
Components of property, plant and equipment [Abstract]
Estimated useful lives										15 years
Construction in Progress [Member]
Components of property, plant and equipment [Abstract]
Property, plant and equipment, gross	2,821,000				6,846,000				6,846,000	2,821,000	6,846,000
Fiber and Data Segment [Member]
Goodwill [Line Items]
Goodwill	5,384,000				5,384,000				5,384,000	5,384,000	5,384,000
Equipment Segment [Member]
Goodwill [Line Items]
Goodwill	596,000				596,000				596,000	596,000	596,000
Telecom Segment [Member]
Goodwill [Line Items]
Goodwill	$ 23,048,000				$ 23,048,000				$ 23,048,000	$ 23,048,000	$ 23,048,000