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MORTGAGE BANKING OPERATIONS - Loans Held for Sale (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for sale $ 395,112 $ 361,932
Commercial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for sale 259,170 167,289
Single family    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for sale $ 135,942 $ 194,643