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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Components of net periodic benefit cost        
Service cost, included in salaries and employee benefits $ 493 $ 401 $ 1,478 $ 1,202
Other components of net periodic benefit cost:        
Interest cost 114 138 343 413
Expected return on plan assets (433) (374) (1,300) (1,119)
Amortization of prior service credit (17) (17) (51) (51)
Recognized net actuarial losses 61 49 182 148
Other components of net periodic benefit cost, included in other noninterest income (275) (204) (826) (609)
Net periodic benefit cost $ 218 $ 197 $ 652 $ 593