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MORTGAGE BANKING OPERATIONS - Loans Sold (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Proceeds from sale of loans originated as held for sale $ 538,900 $ 857,260 $ 2,135,360 $ 1,895,342
Commercial loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Proceeds from sale of loans originated as held for sale 69,810 170,980 465,948 502,059
Single family        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Proceeds from sale of loans originated as held for sale $ 469,090 $ 686,280 $ 1,669,412 $ 1,393,283