LOAN SERVICING RIGHTS - Schedule of Activity of Servicing Rights (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning carrying value, net	$ 136,542
Amortization	(2,142)
Ending carrying value, net	212,500	$ 136,542
Residential mortgage
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning carrying value, net	130,630	94,902	$ 11,814
Additions	93,229	98,182	12,559
Addition due to acquisition	0	0	78,855
Amortization	(30,540)	(23,151)	(8,222)
(Impairment)/recoveries	13,625	(39,303)	(104)
Ending carrying value, net	206,944	130,630	94,902
Residential mortgage servicing impairment
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning carrying value, net	39,407	104	0
Additions	1,398	39,303	1,564
(Impairment)/recoveries	15,023	0	1,460
Ending carrying value, net	25,782	39,407	104
SBA
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning carrying value, net	5,839	7,886	3,012
Additions	954	1,571	1,004
Addition due to acquisition	0	0	5,242
Purchase accounting adjustment	0	(1,214)	0
Amortization		(1,640)	(1,231)
(Impairment)/recoveries	905	(764)	(141)
Ending carrying value, net	5,556	5,839	7,886
SBA servicing impairment
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning carrying value, net	905	141	0
Additions	0	1,645	141
(Impairment)/recoveries	905	881	0
Ending carrying value, net	0	905	141
Indirect automobile
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning carrying value, net	73	247	0
Addition due to acquisition	0	0	777
Amortization	(73)	(174)	(268)
(Impairment)/recoveries	0	0	(262)
Ending carrying value, net	$ 0	$ 73	$ 247