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Company-Owned Life Insurance (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Company - Owned Life Insurance, By Type    
Total $ 260,551 $ 198,116
Key executive, principal shareholder    
Schedule of Company - Owned Life Insurance, By Type    
Cash surrender value of life insurance 4,200 4,000
Key executive split dollar    
Schedule of Company - Owned Life Insurance, By Type    
Cash surrender value of life insurance 4,900 4,800
FIB | Group life    
Schedule of Company - Owned Life Insurance, By Type    
Cash surrender value of life insurance $ 251,500 $ 189,300