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Business Combinations - Pro Forma Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Provision for credit losses $ 9,937 $ 18,958 $ 44,228 $ 13,508
Interest Income (Expense), after Provision for Loan Loss, Total 203,905 196,624 598,053 542,215
Total noninterest income 55,961 59,162 168,300 172,809
Total noninterest expenses 171,020 169,558 498,656 465,266
Income Before Income Taxes 88,846 86,228 267,697 249,758
Income tax expense 16,749 15,357 47,680 44,610
Prudential        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Provision for credit losses $ 0 $ 7,954 0 7,954
Prudential | Pro Forma        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Net interest income     642,281 575,996
Provision for credit losses     44,228 19,528
Interest Income (Expense), after Provision for Loan Loss, Total     598,053 556,468
Total noninterest income     168,300 177,733
Total noninterest expenses     498,656 494,671
Income Before Income Taxes     267,697 239,530
Income tax expense     47,680 41,825
Net Income     $ 220,017 $ 197,705