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Retirement Benefit Plans (Schedule of Fair Value of Plan Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 20,605 $ 18,106
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 7,060 6,203
  Significant Other Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 13,545 11,903
  Significant Unobservable Inputs (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Mid Cap    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2,239 1,176
Mid Cap | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2,239 1,176
Large Cap    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2,574 2,618
Large Cap | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2,574 2,618
International    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,879 2,051
International | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,879 2,051
Wells Fargo Liability Driven Solution    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2,866 2,532
Wells Fargo Liability Driven Solution |   Significant Other Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2,866 2,532
Wells Fargo BlackRock International Equity    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 861 765
Wells Fargo BlackRock International Equity |   Significant Other Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 861 765
Wells Fargo Core Bond    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,413 1,266
Wells Fargo Core Bond |   Significant Other Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,413 1,266
Wells Fargo/Causeway International    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 864 766
Wells Fargo/Causeway International |   Significant Other Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 864 766
Wells Fargo BlackRock Large Cap Growth Index Fund    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,153 1,026
Wells Fargo BlackRock Large Cap Growth Index Fund |   Significant Other Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,153 1,026
Wells Fargo BlackRock Large Cap Value Index Fund    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,159 1,025
Wells Fargo BlackRock Large Cap Value Index Fund |   Significant Other Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,159 1,025
Wells Fargo Multi-Manager Small Cap    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,434 1,246
Wells Fargo Multi-Manager Small Cap |   Significant Other Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,434 1,246
Wells Fargo BlackRock Russell 2000 Index Fund    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 667 573
Wells Fargo BlackRock Russell 2000 Index Fund |   Significant Other Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 667 573
Wells Fargo BlackRock S&P Mid Cap Index Fund    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 732 641
Wells Fargo BlackRock S&P Mid Cap Index Fund |   Significant Other Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 732 641
Wells Fargo/MFS Value CIT F    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 599 516
Wells Fargo/MFS Value CIT F |   Significant Other Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 599 516
Wells Fargo/T. Rowe Price Large-Cap Growth Managed CIT    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 602 516
Wells Fargo/T. Rowe Price Large-Cap Growth Managed CIT |   Significant Other Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 602 516
Wells Fargo/T. Rowe Price Equity Income    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 590 515
Wells Fargo/T. Rowe Price Equity Income |   Significant Other Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 590 515
Wells Fargo Voya Large Cap Growth CIT F    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 605 516
Wells Fargo Voya Large Cap Growth CIT F |   Significant Other Observable Inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 605 516
Cash & Short-term Investments    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 368 358
Cash & Short-term Investments | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 368 $ 358