Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Components of net periodic benefit cost
Service cost, included in salaries and employee benefits	$ 293	$ 306
Other components of net periodic benefit cost:
Interest cost	153	133
Expected return on plan assets	(330)	(318)
Amortization of prior service credit	(17)	(15)
Recognized net actuarial losses	42	29
Other components of net periodic benefit cost, included in other noninterest income	(152)	(171)
Net periodic benefit cost	$ 141	$ 135