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Business Combinations - Pro Forma Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Provision for credit losses   $ 28,021 $ (14,600) $ 76,920
Net Interest Income After Provision for Credit Losses   753,613 678,330 552,287
Total noninterest income   227,130 273,745 229,388
Total noninterest expense   633,728 617,830 579,440
Income Before Income Taxes   347,015 334,245 202,235
Income tax benefit   60,034 58,748 24,195
Net Income   286,981 275,497 178,040
Prudential        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Provision for credit losses   7,954 0 $ 0
Net Interest Income After Provision for Credit Losses $ 567      
Total noninterest income   197    
Total noninterest expense 3,583      
Income tax benefit $ (753)      
Prudential | Pro Forma        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Net interest income   801,907 687,216  
Provision for credit losses   34,041 (14,400)  
Net Interest Income After Provision for Credit Losses   767,866 701,616  
Total noninterest income   232,054 277,217  
Total noninterest expense   663,133 635,568  
Income Before Income Taxes   336,787 343,265  
Income tax benefit   57,249 59,985  
Net Income   $ 279,538 $ 283,280