SECURITIES (Available for Sale Securities Unrealized Losses) (Details) $ in Thousands	Dec. 31, 2022 USD ($) bankLocation	Dec. 31, 2021 USD ($) bankLocation
Fair Value
Less than 12 months	$ 2,259,415	$ 3,226,422
12 months or longer	3,037,801	815,822
Total	5,297,216	4,042,244
Unrealized Losses
Less than 12 months	(147,396)	(57,123)
12 months or longer	(495,684)	(27,110)
Total	$ (643,080)	$ (84,233)
Less than 12 Months, Count | bankLocation	243	242
12 Months or Longer, Count | bankLocation	284	86
Total, Count | bankLocation	527	328
U.S. treasuries
Fair Value
Less than 12 months	$ 28,699
12 months or longer	0
Total	28,699
Unrealized Losses
Less than 12 months	(678)
12 months or longer	0
Total	$ (678)
Less than 12 Months, Count | bankLocation	4
12 Months or Longer, Count | bankLocation	0
Total, Count | bankLocation	4
U.S. agencies
Fair Value
Less than 12 months	$ 16,487	$ 100,839
12 months or longer	26,648	0
Total	43,135	100,839
Unrealized Losses
Less than 12 months	(222)	(812)
12 months or longer	(6,080)	0
Total	$ (6,302)	$ (812)
Less than 12 Months, Count | bankLocation	5	2
12 Months or Longer, Count | bankLocation	2	0
Total, Count | bankLocation	7	2
Obligations of states and political subdivisions
Fair Value
Less than 12 months	$ 288,457	$ 596,866
12 months or longer	589,641	236,329
Total	878,098	833,195
Unrealized Losses
Less than 12 months	(28,378)	(10,115)
12 months or longer	(141,777)	(6,501)
Total	$ (170,155)	$ (16,616)
Less than 12 Months, Count | bankLocation	69	113
12 Months or Longer, Count | bankLocation	113	49
Total, Count | bankLocation	182	162
Mortgage-backed securities - agency
Fair Value
Less than 12 months	$ 241,288	$ 1,383,808
12 months or longer	1,528,951	474,724
Total	1,770,239	1,858,532
Unrealized Losses
Less than 12 months	(21,420)	(33,291)
12 months or longer	(248,623)	(17,891)
Total	$ (270,043)	$ (51,182)
Less than 12 Months, Count | bankLocation	99	83
12 Months or Longer, Count | bankLocation	126	19
Total, Count | bankLocation	225	102
Mortgage-backed securities - non-agency
Fair Value
Less than 12 months	$ 950,054	$ 929,515
12 months or longer	693,531	23,821
Total	1,643,585	953,336
Unrealized Losses
Less than 12 months	(70,213)	(10,870)
12 months or longer	(76,636)	(159)
Total	$ (146,849)	$ (11,029)
Less than 12 Months, Count | bankLocation	25	27
12 Months or Longer, Count | bankLocation	25	5
Total, Count | bankLocation	50	32
Commercial mortgage-backed securities - agency
Fair Value
Less than 12 months	$ 27,732	$ 26,999
12 months or longer	57,392	53,025
Total	85,124	80,024
Unrealized Losses
Less than 12 months	(2,291)	(689)
12 months or longer	(13,104)	(2,225)
Total	$ (15,395)	$ (2,914)
Less than 12 Months, Count | bankLocation	12	8
12 Months or Longer, Count | bankLocation	7	5
Total, Count | bankLocation	19	13
Commercial mortgage-backed securities - non-agency
Fair Value
Less than 12 months	$ 530,541	$ 74,450
12 months or longer	84,619	14,124
Total	615,160	88,574
Unrealized Losses
Less than 12 months	(16,830)	(145)
12 months or longer	(3,222)	(218)
Total	$ (20,052)	$ (363)
Less than 12 Months, Count | bankLocation	15	3
12 Months or Longer, Count | bankLocation	4	2
Total, Count | bankLocation	19	5
Asset-backed securities
Fair Value
Less than 12 months	$ 118,613	$ 113,945
12 months or longer	56,621	13,799
Total	175,234	127,744
Unrealized Losses
Less than 12 months	(6,107)	(1,201)
12 months or longer	(6,236)	(116)
Total	$ (12,343)	$ (1,317)
Less than 12 Months, Count | bankLocation	7	6
12 Months or Longer, Count | bankLocation	6	6
Total, Count | bankLocation	13	12
Corporate bonds
Fair Value
Less than 12 months	$ 57,544
12 months or longer	398
Total	57,942
Unrealized Losses
Less than 12 months	(1,257)
12 months or longer	(6)
Total	$ (1,263)
Less than 12 Months, Count | bankLocation	7
12 Months or Longer, Count | bankLocation	1
Total, Count | bankLocation	8