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Employee Benefit Plans - Summary of funded status of Retirement Income Plan and amounts recognized in consolidated balance sheets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation at end of year $ 43,417 $ 46,397  
Retirement Income Plan      
CHANGE IN PROJECTED BENEFIT OBLIGATION:      
Benefit obligation at beginning of year 46,397 44,315  
Service cost 0 0 $ 0
Interest cost 1,832 1,932 2,006
Amendments 0 0  
Actuarial loss (2,658) 2,206  
Benefits paid 2,154 2,056  
Projected benefit obligation at end of year 43,417 46,397 44,315
CHANGE IN PLAN ASSETS:      
Fair value of plan assets at beginning of year 38,050 34,745  
Actual return on plan assets (2,532) 5,361  
Employer contribution 5,000 0  
Benefits paid (2,154) (2,056)  
Fair value of plan assets at end of year 38,364 38,050 34,745
Funded status at end of year (5,053) (8,347)  
AMOUNTS (PRE-TAX) RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) CONSIST OF:      
Net loss 24,650 22,762  
Prior service cost (credit) 0 0  
Net transition obligation (asset) 0 0 $ 0
Before-tax amount $ 24,650 $ 22,762