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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Components of net periodic benefit cost    
Service cost, included in salaries and employee benefits $ 487 $ 386
Other components of net periodic benefit cost:    
Interest cost 116 135
Expected return on plan assets (440) (374)
Amortization of prior service credit (17) (17)
Recognized net actuarial losses 60 42
Other components of net periodic benefit cost, included in other noninterest income (281) (214)
Net periodic benefit cost $ 206 $ 172