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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Components of net periodic benefit cost        
Service cost, included in salaries and employee benefits $ 498 $ 415 $ 985 $ 801
Other components of net periodic benefit cost:        
Interest cost 113 140 229 275
Expected return on plan assets (427) (371) (867) (745)
Amortization of prior service credit (17) (17) (34) (34)
Recognized net actuarial losses 61 57 121 99
Other components of net periodic benefit cost, included in other noninterest income (270) (191) (551) (405)
Net periodic benefit cost $ 228 $ 224 $ 434 $ 396