ALLOWANCE FOR CREDIT LOSSES (Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	$ 155,937	$ 152,673	$ 155,937
Balance at end of year		161,106	152,673	$ 155,937
Commercial loans:
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	36,770	40,546	36,770
Charge-offs		(14,191)
Balance at end of year		45,154	40,546	36,770
Mortgage loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	34,317	18,930	34,317
Charge-offs		(759)
Balance at end of year		15,349	18,930	34,317
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	19,175	23,278	19,175
Charge-offs		(23,655)
Balance at end of year		27,093	23,278	19,175
Auto loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	65,675	69,919	65,675
Charge-offs		(43,764)
Balance at end of year		73,510	69,919	65,675
Non-PCD
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	132,065	141,841	132,065	161,015
Provision for (recapture of) credit losses		61,765	42,418	(6,877)
Charge-offs		(82,369)	(61,524)	(52,987)
Recoveries		31,373	28,882	30,914
Balance at end of year		152,610	141,841	132,065
Non-PCD \| Commercial loans:
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	32,262	39,158	32,262	45,779
Provision for (recapture of) credit losses		18,200	19,076	(7,130)
Charge-offs		(14,191)	(13,380)	(8,788)
Recoveries		874	1,200	2,401
Balance at end of year		44,041	39,158	32,262
Non-PCD \| Mortgage loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	15,299	9,571	15,299	19,687
Provision for (recapture of) credit losses		(2,031)	(8,758)	(242)
Charge-offs		(759)	(284)	(5,789)
Recoveries		1,217	3,314	1,643
Balance at end of year		7,998	9,571	15,299
Non-PCD \| Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	19,141	23,264	19,141	25,253
Provision for (recapture of) credit losses		23,302	16,084	2,868
Charge-offs		(23,655)	(15,198)	(11,880)
Recoveries		4,175	3,237	2,900
Balance at end of year		27,086	23,264	19,141
Non-PCD \| Auto loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	65,363	69,848	65,363	70,296
Provision for (recapture of) credit losses		22,294	16,016	(2,373)
Charge-offs		(43,764)	(32,662)	(26,530)
Recoveries		25,107	21,131	23,970
Balance at end of year		73,485	69,848	65,363
PCD
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	23,872	10,832	23,872	43,794
Provision for (recapture of) credit losses		(1,488)	(18,010)	7,760
Charge-offs		(3,902)	(2,250)	(33,559)
Recoveries		3,054	7,220	5,877
Balance at end of year		8,496	10,832	23,872
PCD \| Commercial loans:
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	4,508	1,388	4,508	16,405
Provision for (recapture of) credit losses		901	(6,855)	(2,585)
Charge-offs		(2,794)	(69)	(12,241)
Recoveries	1,100	1,618	3,804	2,929
Balance at end of year		1,113	1,388	4,508
PCD \| Mortgage loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	19,018	9,359	19,018	26,389
Provision for (recapture of) credit losses		(2,389)	(10,629)	11,556
Charge-offs		(317)	(1,695)	(20,350)
Recoveries		698	2,665	1,423
Balance at end of year		7,351	9,359	19,018
PCD \| Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	34	14	34	57
Provision for (recapture of) credit losses		518	62	(317)
Charge-offs		(621)	(176)	(22)
Recoveries		96	94	316
Balance at end of year		7	14	34
PCD \| Auto loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	$ 312	71	312	943
Provision for (recapture of) credit losses		(518)	(588)	(894)
Charge-offs		(170)	(310)	(946)
Recoveries		642	657	1,209
Balance at end of year		$ 25	$ 71	$ 312

ALLOWANCE FOR CREDIT LOSSES (Allowance for Credit Losses) (Details) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Mar. 31, 2022

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Financing Receivable, Allowance for Credit Loss [Roll Forward]

Balance at beginning of year

$ 155,937

$ 152,673

$ 155,937