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Business Combinations - Merger-Related Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]      
Salaries and employee benefits $ 356,884 $ 329,138 $ 324,395
Data processing and software 60,255 56,440 48,073
Net occupancy 56,195 53,799 53,013
Other outside services 37,152 34,194 31,432
Professional fees 9,123 9,647 12,835
Marketing 6,885 5,275 5,127
Other 53,482 52,234 65,795
Total Merger-related expenses 10,328 $ 0 $ 0
Acquisition-related Costs | Prudential      
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]      
Salaries and employee benefits 938    
Data processing and software 1,412    
Net occupancy 1,658    
Other outside services 225    
Professional fees 3,053    
Marketing 95    
Charitable donation 2,000    
Other 947    
Total Merger-related expenses $ 10,328