SECURITIES (Securities with Continuous Loss Position) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 208,081	$ 1,462,517
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,477)	(137,551)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	2,042,517	1,222,815
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(356,794)	(293,658)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	2,250,598	2,685,332
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	358,271	431,209
U.S. Government and agency obligations
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	33,407
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(882)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	34,189	16,732
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(740)	(362)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	34,189	50,139
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	740	1,244
Municipal bonds
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	6,049	188,920
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(7)	(25,592)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	103,511	33,907
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(29,184)	(15,178)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	109,560	222,827
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	29,191	40,770
Corporate bonds
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	15,720	108,187
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(46)	(9,547)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	106,852	13,066
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(12,122)	(1,934)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	122,572	121,253
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	12,168	11,481
Mortgage-backed or related securities
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	71,150	930,566
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(212)	(90,537)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,712,125	1,159,110
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(313,963)	(276,184)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	1,783,275	2,089,676
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	314,175	366,721
Asset-backed securities
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	115,162	201,437
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1,212)	(10,993)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	85,840	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(785)	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	201,002	201,437
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	$ 1,997	$ 10,993