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Retirement Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Retirement Benefit Plans [Abstract]      
Net actuarial losses related to supplemental retirement plans $ 417 $ 482  
Supplemental executive retirement plans recognized liabilities 3,874 3,969  
Net actuarial loss for retirement plan, amortized from accumulated other comprehensive income into net periodic benefit cost 29    
Total expense for 401(k) plan $ 411 $ 375 $ 356