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MORTGAGE BANKING OPERATIONS - Loans Serviced for Others (Details) - Commercial loans - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans serviced for others | $ 7,580,946 | $ 7,570,267
Single family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans serviced for others | 5,545,145 | 5,539,180
CRE, multifamily and SBA |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans serviced for others | $ 2,035,801 | $ 2,031,087

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