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DERIVATIVES AND HEDGING ACTIVITIES - Fair Value of Derivatives (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Notional amount	$ 1,601,281	$ 2,322,816
Derivatives before netting, derivative assets	14,803	35,889
Netting adjustments/cash collateral, derivative assets	(4,348)	(8,250)
Derivative assets	10,455	27,639
Derivatives before netting, derivative Liabilities	(11,550)	(24,232)
Netting adjustments/cash collateral, derivative liabilities	9,909	21,447
Derivative liabilities	(1,641)	(2,785)
Concentration of credit risk, master netting arrangements
Derivatives, Fair Value [Line Items]
Right to reclaim cash in excess of fair value of derivative liability	(5,600)	(13,200)
Forward sale commitments
Derivatives, Fair Value [Line Items]
Notional amount	651,906	977,974
Derivatives before netting, derivative assets	1,419	1,035
Derivatives before netting, derivative Liabilities	(1,017)	(3,714)
Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Notional amount	194,587	493,873
Derivatives before netting, derivative assets	4,612	17,395
Derivatives before netting, derivative Liabilities	(3)	(3)
Interest rate swaps
Derivatives, Fair Value [Line Items]
Notional amount	399,788	536,969
Derivatives before netting, derivative assets	8,772	17,459
Derivatives before netting, derivative Liabilities	(10,521)	(20,511)
Eurodollar futures
Derivatives, Fair Value [Line Items]
Notional amount	355,000	314,000
Derivatives before netting, derivative assets	0	0
Derivatives before netting, derivative Liabilities	$ (9)	$ (4)

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The amount as of the balance sheet date of the fair value of derivative assets that in accordance with the entity's accounting policy was offset against other derivative contracts under a master netting arrangement.

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