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Employee Benefit Plans, Noncontributory Defined Benefit Pension Plan (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Plan
Jun. 30, 2018
USD ($)
Employee Benefit Plans [Abstract]        
Number of plans | Plan     2  
Pension Plan [Member]        
Components of net periodic benefit cost [Abstract]        
Net periodic benefit cost $ 85 $ (46) $ 169 $ (92)
Expected employer contribution to pension plan 250   250  
Pension Plan [Member] | Salary and Employee Benefits [Member]        
Components of net periodic benefit cost [Abstract]        
Service cost 89 90 178 179
Pension Plan [Member] | Other Expenses [Member]        
Components of net periodic benefit cost [Abstract]        
Interest cost 139 162 278 325
Expected return on plan assets (205) (345) (410) (689)
Net amortization and deferral $ 62 $ 47 $ 123 $ 93