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MORTGAGE BANKING OPERATIONS - Gain on Sale (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Gain on mortgage loan origination and sale activities [Line Items]
Gain on loan origination and sale activities	$ 21,271	$ 30,027	$ 54,730	$ 52,568
Commercial loans
Gain on mortgage loan origination and sale activities [Line Items]
Gain on loan origination and sale activities	5,435	1,739	12,707	6,449
Single family
Gain on mortgage loan origination and sale activities [Line Items]
Gain on loan origination and sale activities	$ 15,836	$ 28,288	$ 42,023	$ 46,119

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Gain on mortgage loan origination and sale activities [Line Items]

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Net Gains Losses On Mortgage Loan Origination And Sales Activities, Including Discontinued Operations

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