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Retirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 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 $ 365 $ 431 $ 764 $ 779  
Interest Cost 343 274 740 799  
Expected Return on Plan Assets (761) (896) (1,531) (1,681)  
Amortization of Prior Service (Credit) Cost 18 (13) 35 (25)  
Amortization of Net Loss 154 64 307 97  
Net Periodic Cost 119 (140) 315 (31)  
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 65 196 162 207  
Interest Cost 56 54 108 104  
Expected Return on Plan Assets 0 0 0 0  
Amortization of Prior Service (Credit) Cost 13 15 27 29  
Amortization of Net Loss 30 33 57 66  
Net Periodic Cost 164 298 354 406  
Plan Contributions During the Period 117 117 233 233  
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 31 35 61 68  
Interest Cost 93 68 182 167  
Expected Return on Plan Assets 0 0 0 0  
Amortization of Prior Service (Credit) Cost 26 53 51 50  
Amortization of Net Loss (5) 6 (22) 0  
Net Periodic Cost 145 162 272 285  
Plan Contributions During the Period 54 $ 102 91 $ 119  
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%