SECURITIES (Securities with Continuous Loss Position) (Details) $ in Thousands	Sep. 30, 2023 USD ($) numberOfSecurities	Dec. 31, 2022 USD ($) numberOfSecurities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 322,961	$ 1,462,517
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,948,668	1,222,815
Debt Securities, Available-for-sale, Unrealized Loss Position	2,271,629	2,685,332
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	9,038	137,551
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	477,398	293,658
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 486,436	$ 431,209
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | numberOfSecurities	233	298
U.S. Government and agency obligations
Schedule of Held-to-maturity Securities [Line Items]
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, 12 Months or Longer	34,327	16,732
Debt Securities, Available-for-sale, Unrealized Loss Position	34,327	50,139
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, Accumulated Loss	1,015	362
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	1,015	1,244
Municipal bonds
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	24,409	188,920
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	99,189	33,907
Debt Securities, Available-for-sale, Unrealized Loss Position	123,598	222,827
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2,095	25,592
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	41,209	15,178
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	43,304	40,770
Corporate bonds
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	5,715	108,187
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	88,682	13,066
Debt Securities, Available-for-sale, Unrealized Loss Position	94,397	121,253
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	264	9,547
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	13,983	1,934
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	14,247	11,481
Mortgage-backed or related securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	178,325	930,566
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,641,125	1,159,110
Debt Securities, Available-for-sale, Unrealized Loss Position	1,819,450	2,089,676
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	4,816	90,537
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	419,911	276,184
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	424,727	366,721
Asset-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	114,512	201,437
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	85,345	0
Debt Securities, Available-for-sale, Unrealized Loss Position	199,857	201,437
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,863	10,993
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,280	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 3,143	$ 10,993