DERIVATIVES - Derivatives Recorded at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Derivative assets	$ 522,862	$ 138,173
Derivative liabilities	87,150	34,583
Interest rate swaps
Derivative [Line Items]
Derivative asset, variation margin accounts	506,200	60,700
Interest rate swaps | Other assets
Derivative [Line Items]
Derivative assets	72	52
Interest rate lock commitments | Other assets
Derivative [Line Items]
Derivative assets	44,333	114,871
Interest rate lock commitments | Accrued expenses and other liabilities
Derivative [Line Items]
Derivative liabilities	60,241	3,093
TBAs | Other assets
Derivative [Line Items]
Derivative assets	478,457	15,472
TBAs | Accrued expenses and other liabilities
Derivative [Line Items]
Derivative liabilities	26,909	31,490
Options on treasury futures | Other assets
Derivative [Line Items]
Derivative assets	$ 0	$ 7,778