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Retirement Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 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 $ 399 $ 348  
Interest Cost 397 525  
Expected Return on Plan Assets (770) (785)  
Amortization of Prior Service (Credit) Cost 17 (12)  
Amortization of Net Loss 153 33  
Net Periodic (Benefit) Cost 196 109  
Plan Contributions During the Period 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 97 11  
Interest Cost 52 50  
Expected Return on Plan Assets 0 0  
Amortization of Prior Service (Credit) Cost 14 14  
Amortization of Net Loss 27 33  
Net Periodic (Benefit) Cost 190 108  
Plan Contributions During the Period 116 116  
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 33  
Interest Cost 89 99  
Expected Return on Plan Assets 0 0  
Amortization of Prior Service (Credit) Cost 25 (3)  
Amortization of Net Loss (17) (6)  
Net Periodic (Benefit) Cost 127 123  
Plan Contributions During the Period $ 37 $ 17  
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%