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MORTGAGE BANKING OPERATIONS - Loans Serviced for Others (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans serviced for others | $ 7,732,928 | $ 7,758,833
Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans serviced for others | 2,033,126 | 1,844,241
Single family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans serviced for others | $ 5,699,802 | $ 5,914,592

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