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Employee Benefit Plans 15 (Details) - SERP - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Components of Net Periodic Benefits Cost:      
Service cost $ 1,392 $ 1,029 $ 1,193
Interest cost 915 988 1,069
Amortization of prior service cost (credit) 0 0 0
Amortization of net loss 1,678 843 471
Net periodic pension cost under accounting standards $ 3,985 $ 2,860 $ 2,733
Weighted-average assumptions used to determine net periodic cost:      
Discount rate 2.52% 3.36% 4.40%
Rate of compensation increase   4.00% 4.00%
Rate of compensation increase   4.00%  
Minimum      
Weighted-average assumptions used to determine net periodic cost:      
Rate of compensation increase 4.00%    
Maximum      
Weighted-average assumptions used to determine net periodic cost:      
Rate of compensation increase 4.50%