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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
DB Pension Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 76,219 $ 79,138  
Service cost 0 1,587 $ 2,434
Interest cost 2,473 2,987 3,069
Plan participants’ contributions 0 0  
Amendments 0 0  
Curtailments 0 (677)  
Actuarial loss (gain) 1,403 (4,224)  
Benefits paid (2,791) (2,592)  
Benefit obligation at end of year 77,304 76,219 79,138
Change in plan assets:      
Fair value of plan assets at beginning of year 68,931 71,227  
Actual return on plan assets 4,367 296  
Plan participants’ contributions 0 0  
Employer contributions 1,300 0  
Benefits paid (2,791) (2,592)  
Fair value of plan assets at end of year 71,807 68,931 71,227
Unfunded status (5,497) (7,288)  
Life and Healthcare Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year 8,732 8,927  
Service cost 258 236 201
Interest cost 283 323 367
Plan participants’ contributions 185 202  
Amendments 0 0  
Curtailments 0 0  
Actuarial loss (gain) 210 (467)  
Benefits paid (547) (489)  
Benefit obligation at end of year 9,121 8,732 8,927
Change in plan assets:      
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Plan participants’ contributions 185 202  
Employer contributions 362 287  
Benefits paid (547) (489)  
Fair value of plan assets at end of year 0 0 0
Unfunded status (9,121) (8,732)  
SERPs      
Change in benefit obligation:      
Benefit obligation at beginning of year 22,160 22,862  
Service cost 171 201 222
Interest cost 832 928 866
Plan participants’ contributions 0 0  
Amendments 188 0  
Curtailments 0 0  
Actuarial loss (gain) 697 (1,210)  
Benefits paid (649) (621)  
Benefit obligation at end of year 23,399 22,160 22,862
Change in plan assets:      
Fair value of plan assets at beginning of year 0 0  
Actual return on plan assets 0 0  
Plan participants’ contributions 0 0  
Employer contributions 649 621  
Benefits paid (649) (621)  
Fair value of plan assets at end of year 0 0 $ 0
Unfunded status $ (23,399) $ (22,160)