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MORTGAGE BANKING OPERATIONS - Gain on Sale (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Gain on mortgage loan origination and sale activities [Line Items]
Gain on loan origination and sale activities	$ 17,509	$ 33,130	$ 72,239	$ 85,698
Commercial loans
Gain on mortgage loan origination and sale activities [Line Items]
Gain on loan origination and sale activities	3,260	5,498	15,967	11,947
Single family
Gain on mortgage loan origination and sale activities [Line Items]
Gain on loan origination and sale activities	$ 14,249	$ 27,632	$ 56,272	$ 73,751

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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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