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Employee Benefit Plans, other Post-Retirement Benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Amounts included in the Consolidated Balance Sheet, before tax      
Net prior service costs $ 6,846 $ 17,246  
Net actuarial loss (7,280) (8,436)  
Sum net prior service cost and net actuarial loss (434) 8,810  
Amounts to be amortized to net benefit cost      
Estimated net actuarial loss amortized from accumulated other comprehensive loss into net periodic benefit cost next year 200    
Estimated prior service cost gain amortized from accumulated other comprehensive loss into net periodic benefit cost next year 2,000    
Change in benefit obligation      
Benefit obligation at beginning of year 34,645 46,142  
Service cost 549 1,018 $ 1,348
Interest cost 1,540 2,255 2,137
Plan amendments 7,412 (2,057)  
Actuarial (gain) loss (3,723) (10,897)  
Prescription drug subsidy 227 264  
Employee contribution 2,222 2,216  
Benefits paid (4,101) (4,296)  
Benefit obligation at end of year 38,771 34,645 46,142
Defined Benefit Plan, Plan Amendments And Revaluation 8,600    
Change in plan assets      
Fair value of plan assets at beginning of year 51,324 49,743  
Actual return (loss) on plan assets 395 3,495  
Employee contribution 2,222 2,216  
Employer contribution 168 166  
Benefits paid (4,101) (4,296)  
Fair value of plan assets at end of year 50,008 51,324 49,743
Funded status $ 11,237 16,679  
Benefit plan, investment and asset allocation      
Three year return 8.02%    
Five year return 7.40%    
Net periodic benefit cost      
Service cost $ 549 1,018 1,348
Interest cost 1,540 2,255 2,137
Expected return on plan assets (3,252) (3,402) (3,065)
Amortization of prior service costs [1] (2,988) (3,644) (3,605)
Amortization of actuarial losses [2] 290 1,287 2,452
Net post-retirement cost $ (3,861) $ (2,486) $ (733)
Benefit obligations      
Discount rate 4.40% 4.20%  
Net periodic benefit cost assumptions      
Discount rate 4.20% 5.00%  
Expected return on plan assets 6.50% 7.00%  
Discount rate assumptions The discount rate for 2015 and 2014 was determined using a hypothetical Aa spot yield curve represented by a series of annualized individual spot discount rates from six months to 99 years. The spot rate curve was derived from a direct calculation of the implied forward rate curve based on the included bond cash flows. This yield curve, when populated with projected cash flows that represent the expected timing and amount of TDS plan benefit payments, produces a single effective interest discount rate that is used to measure the plan’s liabilities. The expected rate of return was determined using the target asset allocation for the TDS plan and rate of return expectations for each asset class. The measurement date for actuarial determination was December 31, 2015. For measurement purposes, the annual rate of increase in the per capita cost of covered health care benefits was assumed for 2015 to be 9.5% for plan participants aged 65 and above, and 7.3% for participants under age 65. For all participants the 2015 annual rate of increase is expected to decrease to 5.0% by 2024. The 2014 expected rate of increase was 7.8% for plan participants aged 65 and above, and 7.5% for participants under age 65, decreasing to 5.0% for all participants by 2022.    
Health care trend rates      
Ultimate health care cost trend rate 5.00% 5.00%  
One percent increase effect on total service and interest cost components $ 14    
One percent decrease effect on total service and interest cost components (13)    
One percent increase effect on post-retirement benefit obligation 230    
One percent decrease effect on post-retirement benefit obligation (202)    
Estimated future post-retirement benefit payments      
2016 1,823    
2017 1,969    
2018 2,061    
2019 2,163    
2020 2,257    
Estimated future post-retirement benefit payments - 6-10 years $ 12,229    
65 and older      
Health care trend rates      
Health care cost trend rate 9.50% 7.80%  
Under 65      
Health care trend rates      
Health care cost trend rate 7.30% 7.50%  
Level 1      
Change in plan assets      
Fair value of plan assets at beginning of year $ 51,323    
Fair value of plan assets at end of year 37,378 $ 51,323  
Level 2      
Change in plan assets      
Fair value of plan assets at beginning of year 1    
Fair value of plan assets at end of year 12,630 1  
Bond Mutual Funds      
Change in plan assets      
Fair value of plan assets at beginning of year [3] $ 12,842    
Fair value of plan assets at end of year [3]   $ 12,842  
Benefit plan, investment and asset allocation      
Investment strategy of mutual fund Bond (mutual funds) - This type of fund seeks to achieve a maximum total return, consistent with preservation of capital and prudent investment management by investing in a wide spectrum of fixed income instruments including bonds, debt securities and other similar instruments issued by government and private-sector entities.    
Target asset allocation 30.00%    
Actual asset allocation 31.50% 29.00%  
Bond Mutual Funds | Level 1      
Change in plan assets      
Fair value of plan assets at beginning of year [3] $ 12,842    
Fair value of plan assets at end of year [3]   $ 12,842  
Equity Mutual Funds | U.S. Large Cap      
Change in plan assets      
Fair value of plan assets at beginning of year [4] 20,191    
Fair value of plan assets at end of year [4] $ 22,327 20,191  
Benefit plan, investment and asset allocation      
Investment strategy of mutual fund US large cap - This type of fund seeks to track the performance of several benchmark indices that measure the investment return of large-capitalization stocks. The funds attempt to replicate the indices by investing substantially all of their assets in the stocks that make up the various indices in approximately the same proportion as the weighting in the indices.    
Equity Mutual Funds | U.S. Large Cap | Level 1      
Change in plan assets      
Fair value of plan assets at beginning of year [4] $ 20,191    
Fair value of plan assets at end of year [4] 22,327 20,191  
Equity Mutual Funds | U.S. Small Cap      
Change in plan assets      
Fair value of plan assets at beginning of year [5] $ 4,234    
Fair value of plan assets at end of year [5]   4,234  
Benefit plan, investment and asset allocation      
Investment strategy of mutual fund US small cap - This type of fund seeks to track the performance of a benchmark index that measures the investment return of small-capitalization stocks. The fund attempts to replicate the index by investing substantially all of its assets in the stocks that make up the index in approximately the same proportion as the weighting in the index.    
Equity Mutual Funds | U.S. Small Cap | Level 1      
Change in plan assets      
Fair value of plan assets at beginning of year [5] $ 4,234    
Fair value of plan assets at end of year [5]   4,234  
Equity Mutual Funds | International      
Change in plan assets      
Fair value of plan assets at beginning of year [6] 12,003    
Fair value of plan assets at end of year [6] $ 11,912 $ 12,003  
Benefit plan, investment and asset allocation      
Investment strategy of mutual fund International equity - This type of fund seeks to provide long-term capital appreciation by investing in the stocks of companies located outside the United States that are considered to have the potential for above-average capital appreciation.    
Target asset allocation 25.00%    
Actual asset allocation 23.80% 23.40%  
Equity Mutual Funds | International | Level 1      
Change in plan assets      
Fair value of plan assets at beginning of year [6] $ 12,003    
Fair value of plan assets at end of year [6] $ 11,912 $ 12,003  
Equity Mutual Funds | United States      
Benefit plan, investment and asset allocation      
Target asset allocation 45.00%    
Actual asset allocation 44.70% 47.60%  
Money Market Mutual Funds      
Change in plan assets      
Fair value of plan assets at beginning of year [7] $ 2,053    
Fair value of plan assets at end of year [7] $ 3,139 $ 2,053  
Benefit plan, investment and asset allocation      
Investment strategy of mutual fund Money market - This type of fund seeks as high a level of current income as is consistent with the preservation of capital and the maintenance of liquidity by investing in a diversified portfolio of high-quality, dollar-denominated short-term debt securities.    
Money Market Mutual Funds | Level 1      
Change in plan assets      
Fair value of plan assets at beginning of year [7] $ 2,053    
Fair value of plan assets at end of year [7] 3,139 2,053  
Bond Bank Common Trust      
Change in plan assets      
Fair value of plan assets at end of year [8] $ 12,630    
Benefit plan, investment and asset allocation      
Investment strategy of mutual fund Bond (bank common trust) – This type of fund seeks to achieve maximum total return by investing in Bond Index Funds and other short-term investments.    
Bond Bank Common Trust | Level 2      
Change in plan assets      
Fair value of plan assets at end of year [8] $ 12,630    
Other      
Change in plan assets      
Fair value of plan assets at beginning of year 1    
Fair value of plan assets at end of year   1  
Other | Level 2      
Change in plan assets      
Fair value of plan assets at beginning of year $ 1    
Fair value of plan assets at end of year   $ 1  
[1] Based on straight-line amortization over the average time remaining before active employees become fully eligible for plan benefits.
[2] Based on straight-line amortization over the average time remaining before active employees retire.
[3] Bond (mutual funds) - This type of fund seeks to achieve a maximum total return, consistent with preservation of capital and prudent investment management by investing in a wide spectrum of fixed income instruments including bonds, debt securities and other similar instruments issued by government and private-sector entities.
[4] US large cap - This type of fund seeks to track the performance of several benchmark indices that measure the investment return of large-capitalization stocks. The funds attempt to replicate the indices by investing substantially all of their assets in the stocks that make up the various indices in approximately the same proportion as the weighting in the indices.
[5] US small cap - This type of fund seeks to track the performance of a benchmark index that measures the investment return of small-capitalization stocks. The fund attempts to replicate the index by investing substantially all of its assets in the stocks that make up the index in approximately the same proportion as the weighting in the index.
[6] International equity - This type of fund seeks to provide long-term capital appreciation by investing in the stocks of companies located outside the United States that are considered to have the potential for above-average capital appreciation.
[7] Money market - This type of fund seeks as high a level of current income as is consistent with the preservation of capital and the maintenance of liquidity by investing in a diversified portfolio of high-quality, dollar-denominated short-term debt securities.
[8] Bond (bank common trust) – This type of fund seeks to achieve maximum total return by investing in Bond Index Funds and other short-term investments.