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MORTGAGE BANKING OPERATIONS - Loans Sold (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Proceeds from sale of loans originated as held for sale $ 765,703 $ 445,772 $ 1,596,460 $ 1,038,082
Commercial loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Proceeds from sale of loans originated as held for sale 138,421 48,622 396,138 331,079
Single family        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Proceeds from sale of loans originated as held for sale $ 627,282 $ 397,150 $ 1,200,322 $ 707,003