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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Bank owned life insurance [Line Items]    
Bank-owned life insurance $ 41,538 $ 40,323
Bank owned life insurance death benefits 97,800 97,700
Insured executive officers with deferred compensation plans    
Bank owned life insurance [Line Items]    
Bank-owned life insurance 2,500 2,400
Bank owned life insurance death benefits 5,900 5,900
Other insured individuals    
Bank owned life insurance [Line Items]    
Bank-owned life insurance $ 39,000 $ 37,900