GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Subsequent fair value adjustments	$ 0	$ (3,632)
Carrying value of intangible assets	125,938	72,000
Amortization of intangible assets	14,965	19,612	$ 17,713
Finite-Lived Intangible Assets, Gross	196,111	131,565
Balboa Capital Corporation
Goodwill [Line Items]
Goodwill net additions recorded	84,600
Fidelity Southern Corporation
Goodwill [Line Items]
Subsequent fair value adjustments	(3,600)
Core deposit premiums
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	103,574	107,958
Core deposit premiums | Fidelity Southern Corporation
Goodwill [Line Items]
Acquired finite-lived intangible assets			$ 68,900
Referral relationships
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	88,651	22,351
Trade names
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	2,734	1,094
Non-compete agreements
Goodwill [Line Items]
Finite-Lived Intangible Assets, Gross	$ 732	$ 162