SECURITIES (Available for Sale Securities Unrealized Losses) (Details) $ in Thousands	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Fair Value
Less than 12 months	$ 629,647	$ 2,259,415
12 months or longer	3,770,658	3,037,801
Total	4,400,305	5,297,216
Unrealized Losses
Less than 12 months	(34,481)	(147,396)
12 months or longer	(419,373)	(495,684)
Total	$ (453,854)	$ (643,080)
Less than 12 Months, Count | security	21	243
12 Months or Longer, Count | security	406	284
Total, Count | security	427	527
U.S. treasuries
Fair Value
Less than 12 months	$ 2,985	$ 28,699
12 months or longer	26,138	0
Total	29,123	28,699
Unrealized Losses
Less than 12 months	(12)	(678)
12 months or longer	(329)	0
Total	$ (341)	$ (678)
Less than 12 Months, Count | security	1	4
12 Months or Longer, Count | security	3	0
Total, Count | security	4	4
U.S. agencies
Fair Value
Less than 12 months	$ 0	$ 16,487
12 months or longer	14,530	26,648
Total	14,530	43,135
Unrealized Losses
Less than 12 months	0	(222)
12 months or longer	(194)	(6,080)
Total	$ (194)	$ (6,302)
Less than 12 Months, Count | security	0	5
12 Months or Longer, Count | security	4	2
Total, Count | security	4	7
Obligations of states and political subdivisions
Fair Value
Less than 12 months	$ 1,440	$ 288,457
12 months or longer	736,653	589,641
Total	738,093	878,098
Unrealized Losses
Less than 12 months	(65)	(28,378)
12 months or longer	(98,469)	(141,777)
Total	$ (98,534)	$ (170,155)
Less than 12 Months, Count | security	1	69
12 Months or Longer, Count | security	150	113
Total, Count | security	151	182
Mortgage-backed securities - agency
Fair Value
Less than 12 months	$ 194	$ 241,288
12 months or longer	1,392,769	1,528,951
Total	1,392,963	1,770,239
Unrealized Losses
Less than 12 months	(2)	(21,420)
12 months or longer	(226,791)	(248,623)
Total	$ (226,793)	$ (270,043)
Less than 12 Months, Count | security	2	99
12 Months or Longer, Count | security	166	126
Total, Count | security	168	225
Mortgage-backed securities - non-agency
Fair Value
Less than 12 months	$ 415,934	$ 950,054
12 months or longer	902,291	693,531
Total	1,318,225	1,643,585
Unrealized Losses
Less than 12 months	(24,568)	(70,213)
12 months or longer	(63,081)	(76,636)
Total	$ (87,649)	$ (146,849)
Less than 12 Months, Count | security	12	25
12 Months or Longer, Count | security	35	25
Total, Count | security	47	50
Commercial mortgage-backed securities - agency
Fair Value
Less than 12 months	$ 0	$ 27,732
12 months or longer	64,788	57,392
Total	64,788	85,124
Unrealized Losses
Less than 12 months	0	(2,291)
12 months or longer	(11,288)	(13,104)
Total	$ (11,288)	$ (15,395)
Less than 12 Months, Count | security	0	12
12 Months or Longer, Count | security	17	7
Total, Count | security	17	19
Commercial mortgage-backed securities - non-agency
Fair Value
Less than 12 months	$ 0	$ 530,541
12 months or longer	507,044	84,619
Total	507,044	615,160
Unrealized Losses
Less than 12 months	0	(16,830)
12 months or longer	(12,116)	(3,222)
Total	$ (12,116)	$ (20,052)
Less than 12 Months, Count | security	0	15
12 Months or Longer, Count | security	16	4
Total, Count | security	16	19
Asset-backed securities
Fair Value
Less than 12 months	$ 148,063	$ 118,613
12 months or longer	69,307	56,621
Total	217,370	175,234
Unrealized Losses
Less than 12 months	(9,723)	(6,107)
12 months or longer	(5,047)	(6,236)
Total	$ (14,770)	$ (12,343)
Less than 12 Months, Count | security	4	7
12 Months or Longer, Count | security	7	6
Total, Count | security	11	13
Corporate bonds
Fair Value
Less than 12 months	$ 61,031	$ 57,544
12 months or longer	57,138	398
Total	118,169	57,942
Unrealized Losses
Less than 12 months	(111)	(1,257)
12 months or longer	(2,058)	(6)
Total	$ (2,169)	$ (1,263)
Less than 12 Months, Count | security	1	7
12 Months or Longer, Count | security	8	1
Total, Count | security	9	8