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Employee Benefit Plans, Noncontributory Defined Benefit Pension Plan (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Plan
Sep. 30, 2018
USD ($)
Employee Benefit Plans [Abstract]        
Number of plans | Plan     2  
Pension Plan [Member]        
Components of net periodic benefit cost [Abstract]        
Net periodic benefit cost $ 74 $ 71 $ 243 $ (21)
Expected employer contribution to pension plan 0   0  
Pension Plan [Member] | Salary and Employee Benefits [Member]        
Components of net periodic benefit cost [Abstract]        
Service cost 78 90 256 269
Pension Plan [Member] | Other Expenses [Member]        
Components of net periodic benefit cost [Abstract]        
Interest cost 123 164 401 489
Expected return on plan assets (187) (230) (595) (919)
Net amortization and deferral $ 60 $ 47 $ 181 $ 140