Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Fair Values of Plan Assets by Major Asset Category (Details)

v3.20.4
Employee Benefit Plans - Fair Values of Plan Assets by Major Asset Category (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets $ 7,567 $ 6,615 $ 5,313
Cash and cash equivalents — money markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 1,277 528  
Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 1,567 1,133  
Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 1,503 1,939  
Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 797 465  
Taxable bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 2,423 2,550  
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 7,567 6,615  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents — money markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 1,277 528  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 1,567 1,133  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 1,503 1,939  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 797 465  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Taxable bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 2,423 2,550  
Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Other Observable Inputs (Level 2) | Cash and cash equivalents — money markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Other Observable Inputs (Level 2) | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Other Observable Inputs (Level 2) | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Other Observable Inputs (Level 2) | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Other Observable Inputs (Level 2) | Taxable bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Unobservable Inputs (Level 3) | Cash and cash equivalents — money markets      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Unobservable Inputs (Level 3) | Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Unobservable Inputs (Level 3) | Equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Unobservable Inputs (Level 3) | Fixed income funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets 0 0  
Significant Unobservable Inputs (Level 3) | Taxable bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of Pension Plan assets $ 0 $ 0