MORTGAGE BANKING OPERATIONS - Loans Held for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	$ 421,737	$ 208,177
Loans held for sale, discontinued operations	0	(26,122)
Commercial loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	261,903	128,841
Single family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	$ 159,834	$ 105,458