SECURITIES (Debt securities available for sale) (Details) $ in Thousands |
Sep. 30, 2023
USD ($)
security
|
Dec. 31, 2022
USD ($)
security
|
Debt Securities, Available-for-sale [Line Items] |
|
|
Fair Value, Less than 12 months |
$ 558,364
|
$ 2,259,415
|
Unrealized Losses, Less than 12 months |
$ (43,612)
|
$ (147,396)
|
Count, Less than 12 months | security |
33
|
243
|
Fair Value, 12 months or longer |
$ 4,525,733
|
$ 3,037,801
|
Unrealized Losses, 12 months or longer |
$ (703,049)
|
$ (495,684)
|
Count, 12 months or longer | security |
484
|
284
|
Fair Value, Total |
$ 5,084,097
|
$ 5,297,216
|
Unrealized Losses, Total |
$ (746,661)
|
$ (643,080)
|
Count, Total | security |
517
|
527
|
U.S. treasuries |
|
|
Debt Securities, Available-for-sale [Line Items] |
|
|
Fair Value, Less than 12 months |
$ 5,917
|
$ 28,699
|
Unrealized Losses, Less than 12 months |
$ (72)
|
$ (678)
|
Count, Less than 12 months | security |
2
|
4
|
Fair Value, 12 months or longer |
$ 25,888
|
$ 0
|
Unrealized Losses, 12 months or longer |
$ (559)
|
$ 0
|
Count, 12 months or longer | security |
3
|
0
|
Fair Value, Total |
$ 31,805
|
$ 28,699
|
Unrealized Losses, Total |
$ (631)
|
$ (678)
|
Count, Total | security |
5
|
4
|
U.S. agencies |
|
|
Debt Securities, Available-for-sale [Line Items] |
|
|
Fair Value, Less than 12 months |
$ 0
|
$ 16,487
|
Unrealized Losses, Less than 12 months |
$ 0
|
$ (222)
|
Count, Less than 12 months | security |
0
|
5
|
Fair Value, 12 months or longer |
$ 41,104
|
$ 26,648
|
Unrealized Losses, 12 months or longer |
$ (6,918)
|
$ (6,080)
|
Count, 12 months or longer | security |
6
|
2
|
Fair Value, Total |
$ 41,104
|
$ 43,135
|
Unrealized Losses, Total |
$ (6,918)
|
$ (6,302)
|
Count, Total | security |
6
|
7
|
Obligations of states and political subdivisions |
|
|
Debt Securities, Available-for-sale [Line Items] |
|
|
Fair Value, Less than 12 months |
$ 3,360
|
$ 288,457
|
Unrealized Losses, Less than 12 months |
$ (470)
|
$ (28,378)
|
Count, Less than 12 months | security |
4
|
69
|
Fair Value, 12 months or longer |
$ 771,031
|
$ 589,641
|
Unrealized Losses, 12 months or longer |
$ (207,413)
|
$ (141,777)
|
Count, 12 months or longer | security |
163
|
113
|
Fair Value, Total |
$ 774,391
|
$ 878,098
|
Unrealized Losses, Total |
$ (207,883)
|
$ (170,155)
|
Count, Total | security |
167
|
182
|
Mortgage-backed securities - agency |
|
|
Debt Securities, Available-for-sale [Line Items] |
|
|
Fair Value, Less than 12 months |
$ 1,958
|
$ 241,288
|
Unrealized Losses, Less than 12 months |
$ (62)
|
$ (21,420)
|
Count, Less than 12 months | security |
11
|
99
|
Fair Value, 12 months or longer |
$ 1,591,796
|
$ 1,528,951
|
Unrealized Losses, 12 months or longer |
$ (316,316)
|
$ (248,623)
|
Count, 12 months or longer | security |
215
|
126
|
Fair Value, Total |
$ 1,593,754
|
$ 1,770,239
|
Unrealized Losses, Total |
$ (316,378)
|
$ (270,043)
|
Count, Total | security |
226
|
225
|
Mortgage-backed securities - non-agency |
|
|
Debt Securities, Available-for-sale [Line Items] |
|
|
Fair Value, Less than 12 months |
$ 488,800
|
$ 950,054
|
Unrealized Losses, Less than 12 months |
$ (41,299)
|
$ (70,213)
|
Count, Less than 12 months | security |
14
|
25
|
Fair Value, 12 months or longer |
$ 1,282,494
|
$ 693,531
|
Unrealized Losses, 12 months or longer |
$ (122,063)
|
$ (76,636)
|
Count, 12 months or longer | security |
43
|
25
|
Fair Value, Total |
$ 1,771,294
|
$ 1,643,585
|
Unrealized Losses, Total |
$ (163,362)
|
$ (146,849)
|
Count, Total | security |
57
|
50
|
Commercial mortgage-backed securities - agency |
|
|
Debt Securities, Available-for-sale [Line Items] |
|
|
Fair Value, Less than 12 months |
$ 0
|
$ 27,732
|
Unrealized Losses, Less than 12 months |
$ 0
|
$ (2,291)
|
Count, Less than 12 months | security |
0
|
12
|
Fair Value, 12 months or longer |
$ 81,444
|
$ 57,392
|
Unrealized Losses, 12 months or longer |
$ (17,053)
|
$ (13,104)
|
Count, 12 months or longer | security |
19
|
7
|
Fair Value, Total |
$ 81,444
|
$ 85,124
|
Unrealized Losses, Total |
$ (17,053)
|
$ (15,395)
|
Count, Total | security |
19
|
19
|
Commercial mortgage-backed securities - non-agency |
|
|
Debt Securities, Available-for-sale [Line Items] |
|
|
Fair Value, Less than 12 months |
$ 9,695
|
$ 530,541
|
Unrealized Losses, Less than 12 months |
$ (344)
|
$ (16,830)
|
Count, Less than 12 months | security |
1
|
15
|
Fair Value, 12 months or longer |
$ 584,871
|
$ 84,619
|
Unrealized Losses, 12 months or longer |
$ (18,386)
|
$ (3,222)
|
Count, 12 months or longer | security |
17
|
4
|
Fair Value, Total |
$ 594,566
|
$ 615,160
|
Unrealized Losses, Total |
$ (18,730)
|
$ (20,052)
|
Count, Total | security |
18
|
19
|
Asset-backed securities |
|
|
Debt Securities, Available-for-sale [Line Items] |
|
|
Fair Value, Less than 12 months |
$ 0
|
$ 118,613
|
Unrealized Losses, Less than 12 months |
$ 0
|
$ (6,107)
|
Count, Less than 12 months | security |
0
|
7
|
Fair Value, 12 months or longer |
$ 139,217
|
$ 56,621
|
Unrealized Losses, 12 months or longer |
$ (13,031)
|
$ (6,236)
|
Count, 12 months or longer | security |
11
|
6
|
Fair Value, Total |
$ 139,217
|
$ 175,234
|
Unrealized Losses, Total |
$ (13,031)
|
$ (12,343)
|
Count, Total | security |
11
|
13
|
Corporate bonds |
|
|
Debt Securities, Available-for-sale [Line Items] |
|
|
Fair Value, Less than 12 months |
$ 48,634
|
$ 57,544
|
Unrealized Losses, Less than 12 months |
$ (1,365)
|
$ (1,257)
|
Count, Less than 12 months | security |
1
|
7
|
Fair Value, 12 months or longer |
$ 7,888
|
$ 398
|
Unrealized Losses, 12 months or longer |
$ (1,310)
|
$ (6)
|
Count, 12 months or longer | security |
7
|
1
|
Fair Value, Total |
$ 56,522
|
$ 57,942
|
Unrealized Losses, Total |
$ (2,675)
|
$ (1,263)
|
Count, Total | security |
8
|
8
|