XML 14 R48.htm IDEA: XBRL DOCUMENT v3.19.3
Retirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Net Periodic Benefit Cost [Line Items]          
Employer matching contribution, percentage     5.00%    
Employees' Pension Plan          
Net Periodic Benefit Cost [Line Items]          
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account         3.43%
Service Cost $ 382 $ 389 $ 1,146 $ 1,168  
Interest Cost 513 400 1,253 1,199  
Expected Return on Plan Assets (765) (841) (2,296) (2,522)  
Amortization of Prior Service (Credit) Cost 17 (12) 52 (37)  
Amortization of Net Loss 153 48 460 145  
Net Periodic Cost 300 (16) 615 (47)  
Plan Contributions During the Period 0 0 0 0  
Estimated Future Contributions in the Current Fiscal Year 0   0    
Select Executive Retirement Plan          
Net Periodic Benefit Cost [Line Items]          
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account         4.46%
Service Cost 81 104 243 311  
Interest Cost 54 48 162 152  
Expected Return on Plan Assets 0 0 0 0  
Amortization of Prior Service (Credit) Cost 14 14 41 43  
Amortization of Net Loss 29 33 86 99  
Net Periodic Cost 178 199 532 605  
Plan Contributions During the Period 117 116 350 349  
Estimated Future Contributions in the Current Fiscal Year 0   0    
Post-Retirement Benefit Plans          
Net Periodic Benefit Cost [Line Items]          
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account         4.88%
Service Cost 30 34 91 102  
Interest Cost 91 81 273 248  
Expected Return on Plan Assets 0 0 0 0  
Amortization of Prior Service (Credit) Cost 25 25 76 75  
Amortization of Net Loss (10) 0 (32) 0  
Net Periodic Cost 136 140 408 425  
Plan Contributions During the Period 51 $ 56 142 $ 175  
Estimated Future Contributions in the Current Fiscal Year $ 0   $ 0    
On or Subsequent to January 1, 2003          
Net Periodic Benefit Cost [Line Items]          
Service credits, percent of eligible salaries     6.00%    
Minimum | Prior to January 1, 2003          
Net Periodic Benefit Cost [Line Items]          
Service credits, percent of eligible salaries     6.00%    
Maximum | Prior to January 1, 2003          
Net Periodic Benefit Cost [Line Items]          
Service credits, percent of eligible salaries     12.00%