Employee Benefit Plans, Noncontributory Defined Benefit Pension Plan (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Plan	Mar. 31, 2018 USD ($)
Employee Benefit Plans [Abstract]
Number of plans | Plan	2
Pension Plan [Member]
Components of net periodic benefit cost [Abstract]
Net periodic benefit cost (benefit)	$ 84	$ (46)
Expected employer contribution to pension plan	250
Pension Plan [Member] | Salary and Employee Benefits [Member]
Components of net periodic benefit cost [Abstract]
Service cost	89	89
Pension Plan [Member] | Other Expenses [Member]
Components of net periodic benefit cost [Abstract]
Interest cost	139	163
Expected return on plan assets	(205)	(344)
Net amortization and deferral	$ 61	$ 46