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INVESTMENT SECURITIES - Continuous Unrealized Loss on Investment (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
AFS
AFS, Less than 12 months, Gross unrealized losses	$ (18,621)	$ (95,493)
AFS, Less than 12 months, Fair value	661,841	1,187,577
AFS, Twelve months or more, Gross unrealized losses	(95,381)	(35,604)
AFS, Twelve months or more, Fair value	680,910	146,230
AFS, Total, Gross unrealized losses	(114,002)	(131,097)
AFS, Total, Fair value	1,342,751	1,333,807
Residential mortgage-backed securities
AFS
AFS, Less than 12 months, Gross unrealized losses	(6,312)	(8,845)
AFS, Less than 12 months, Fair value	168,313	191,398
AFS, Twelve months or more, Gross unrealized losses	(2,865)	(1,338)
AFS, Twelve months or more, Fair value	22,732	5,763
AFS, Total, Gross unrealized losses	(9,177)	(10,183)
AFS, Total, Fair value	191,045	197,161
Commercial mortgage-backed securities
AFS
AFS, Less than 12 months, Gross unrealized losses	(194)	(5,729)
AFS, Less than 12 months, Fair value	3,226	41,416
AFS, Twelve months or more, Gross unrealized losses	(8,143)	(3,633)
AFS, Twelve months or more, Fair value	50,990	14,619
AFS, Total, Gross unrealized losses	(8,337)	(9,362)
AFS, Total, Fair value	54,216	56,035
Residential collateralized mortgage obligations
AFS
AFS, Less than 12 months, Gross unrealized losses	(8,414)	(27,789)
AFS, Less than 12 months, Fair value	342,128	498,333
AFS, Twelve months or more, Gross unrealized losses	(25,863)	(11,633)
AFS, Twelve months or more, Fair value	184,686	45,689
AFS, Total, Gross unrealized losses	(34,277)	(39,422)
AFS, Total, Fair value	526,814	544,022
Commercial collateralized mortgage obligations
AFS
AFS, Less than 12 months, Gross unrealized losses	(146)	(4,787)
AFS, Less than 12 months, Fair value	9,071	56,671
AFS, Twelve months or more, Gross unrealized losses	(5,854)	(2,603)
AFS, Twelve months or more, Fair value	61,707	13,848
AFS, Total, Gross unrealized losses	(6,000)	(7,390)
AFS, Total, Fair value	70,778	70,519
Municipal bonds
AFS
AFS, Less than 12 months, Gross unrealized losses	(1,825)	(44,513)
AFS, Less than 12 months, Fair value	52,931	350,918
AFS, Twelve months or more, Gross unrealized losses	(47,072)	(13,326)
AFS, Twelve months or more, Fair value	326,987	46,377
AFS, Total, Gross unrealized losses	(48,897)	(57,839)
AFS, Total, Fair value	379,918	397,295
HTM
HFM, Less than 12 months, Gross unrealized losses	(36)	(56)
HFM, Less than 12 months, Fair value	2,387	2,385
HFM, 12 months or more, Gross unrealized losses	0	0
HFM, 12 months or more, Fair value	0	0
HFM, Total, Gross unrealized losses	(36)	(56)
HTM, Total, Fair value	2,387	2,385
Corporate debt securities
AFS
AFS, Less than 12 months, Gross unrealized losses	(1,550)	(3,801)
AFS, Less than 12 months, Fair value	27,813	32,871
AFS, Twelve months or more, Gross unrealized losses	(2,983)	0
AFS, Twelve months or more, Fair value	13,489	0
AFS, Total, Gross unrealized losses	(4,533)	(3,801)
AFS, Total, Fair value	41,302	32,871
U.S. Treasury securities
AFS
AFS, Less than 12 months, Gross unrealized losses	0	0
AFS, Less than 12 months, Fair value	0	0
AFS, Twelve months or more, Gross unrealized losses	(2,601)	(3,071)
AFS, Twelve months or more, Fair value	20,319	19,934
AFS, Total, Gross unrealized losses	(2,601)	(3,071)
AFS, Total, Fair value	20,319	19,934
Agency debentures
AFS
AFS, Less than 12 months, Gross unrealized losses	(180)	(29)
AFS, Less than 12 months, Fair value	58,359	15,970
AFS, Twelve months or more, Gross unrealized losses	0	0
AFS, Twelve months or more, Fair value	0	0
AFS, Total, Gross unrealized losses	(180)	(29)
AFS, Total, Fair value	$ 58,359	$ 15,970

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