Acquired Loans - Schedule of Acquired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Acquired Loans (Details) - Acquired Loans [Line Items]
PCD	$ 14,582,491	$ 14,512,215
Acquired loans
Acquired Loans (Details) - Acquired Loans [Line Items]
Non-PCD	787,636	1,198,818
Total	948,790	1,410,839
Receivables acquired with deteriorated credit quality | Acquired loans
Acquired Loans (Details) - Acquired Loans [Line Items]
PCD	$ 161,154	$ 212,021