DEBT SECURITIES - Schedule of Amortized Cost, Unrealized Gains and Losses, and Fair Values of Securities Classified as AFS and HTM (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt securities available for sale
Amortized Cost	$ 2,772,453	$ 4,013,523
Gross unrealized gains	144	22,382
Gross unrealized losses	(311,204)	(54,654)
Fair Value	2,461,393	3,981,251
Debt securities held to maturity
Amortized Cost	918,312	0
Gross unrealized gains	0
Gross unrealized losses	(133,017)
Fair Value	785,295
U.S. Treasury securities
Debt securities available for sale
Amortized Cost	117,805	166,768
Gross unrealized gains	0	41
Gross unrealized losses	(3,744)	(1,047)
Fair Value	114,061	165,762
Obligations of U.S. government corporations and agencies
Debt securities available for sale
Amortized Cost	20,097	37,579
Gross unrealized gains	3	891
Gross unrealized losses	(321)	0
Fair Value	19,779	38,470
Obligations of states and political subdivisions
Debt securities available for sale
Amortized Cost	283,481	300,602
Gross unrealized gains	106	7,760
Gross unrealized losses	(26,075)	(1,493)
Fair Value	257,512	306,869
Asset-backed securities
Debt securities available for sale
Amortized Cost	489,558	492,055
Gross unrealized gains	0	295
Gross unrealized losses	(19,683)	(164)
Fair Value	469,875	492,186
Commercial mortgage-backed securities
Debt securities available for sale
Amortized Cost	124,423	625,339
Gross unrealized gains	0	3,425
Gross unrealized losses	(16,029)	(13,766)
Fair Value	108,394	614,998
Debt securities held to maturity
Amortized Cost	474,820
Gross unrealized gains	0
Gross unrealized losses	(63,738)
Fair Value	411,082
Residential mortgage-backed securities
Debt securities available for sale
Amortized Cost	1,463,971	2,095,104
Gross unrealized gains	2	8,889
Gross unrealized losses	(220,717)	(34,680)
Fair Value	1,243,256	2,069,313
Debt securities held to maturity
Amortized Cost	443,492
Gross unrealized gains	0
Gross unrealized losses	(69,279)
Fair Value	374,213
Corporate debt securities
Debt securities available for sale
Amortized Cost	273,118	296,076
Gross unrealized gains	33	1,081
Gross unrealized losses	(24,635)	(3,504)
Fair Value	$ 248,516	$ 293,653

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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