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Business Combinations - Pro Forma Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Provision for credit losses $ 18,958 $ (600) $ 13,508 $ (9,600)
Net Interest Income After Provision for Credit Losses 196,624 171,870 542,215 507,718
Total noninterest income 59,162 62,577 172,809 209,864
Total noninterest expense 169,558 144,596 465,266 463,811
Income Before Income Taxes 86,228 89,851 249,758 253,771
Income taxes 15,357 14,268 44,610 40,160
Net Income 70,871 75,583 205,148 213,611
Prudential        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Provision for credit losses 7,954 0 7,954 0
Net Interest Income After Provision for Credit Losses 567      
Total noninterest income 197      
Total noninterest expense 3,583      
Income taxes (753)      
Prudential | Pro Forma        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Net interest income 215,582 177,328 575,996 515,674
Provision for credit losses 18,958 (400) 19,528 (9,400)
Net Interest Income After Provision for Credit Losses 196,624 177,728 556,468 525,074
Total noninterest income 59,162 63,709 177,733 212,966
Total noninterest expense 169,558 149,234 494,671 477,342
Income Before Income Taxes 86,228 92,203 239,530 260,698
Income taxes 15,357 14,629 41,825 41,143
Net Income $ 70,871 $ 77,574 $ 197,705 $ 219,555