INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Dec. 31, 2025 |
| Investments, Unrealized Loss Position [Line Items] |
|
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months |
$ 2,388,595
|
$ 523,533
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
28,008
|
2,200
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer |
1,400,160
|
1,587,302
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
226,073
|
227,996
|
| Debt Securities, Available-for-Sale, Unrealized Loss Position |
3,788,755
|
2,110,835
|
| Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |
(254,081)
|
(230,196)
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |
3,402
|
2,273
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
(17)
|
(4)
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |
38,336
|
47,336
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
(4,291)
|
(4,267)
|
| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value |
41,738
|
49,609
|
| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss |
(4,308)
|
(4,271)
|
| U.S. Treasuries |
|
|
| Investments, Unrealized Loss Position [Line Items] |
|
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months |
10,033
|
0
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
10
|
0
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer |
95
|
95
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
5
|
4
|
| Debt Securities, Available-for-Sale, Unrealized Loss Position |
10,128
|
95
|
| Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |
(15)
|
(4)
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |
0
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
0
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |
0
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
0
|
0
|
| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value |
0
|
0
|
| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss |
0
|
0
|
| Securities of U.S. government agencies and corporations |
|
|
| Investments, Unrealized Loss Position [Line Items] |
|
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months |
35,470
|
0
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
249
|
0
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer |
0
|
0
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
0
|
0
|
| Debt Securities, Available-for-Sale, Unrealized Loss Position |
35,470
|
0
|
| Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |
(249)
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |
0
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
0
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |
0
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
0
|
0
|
| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value |
0
|
0
|
| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss |
0
|
0
|
| Residential Mortgage Backed Securities [Member] |
|
|
| Investments, Unrealized Loss Position [Line Items] |
|
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months |
1,181,376
|
277,394
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
15,690
|
1,349
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer |
414,361
|
536,694
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
67,267
|
68,418
|
| Debt Securities, Available-for-Sale, Unrealized Loss Position |
1,595,737
|
814,088
|
| Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |
(82,957)
|
(69,767)
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |
0
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
0
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |
0
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
0
|
0
|
| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value |
0
|
0
|
| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss |
0
|
0
|
| Commercial Mortgage Backed Securities [Member] |
|
|
| Investments, Unrealized Loss Position [Line Items] |
|
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months |
189,148
|
39,084
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
2,506
|
108
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer |
151,568
|
166,649
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
13,733
|
13,633
|
| Debt Securities, Available-for-Sale, Unrealized Loss Position |
340,716
|
205,733
|
| Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |
(16,239)
|
(13,741)
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |
0
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
0
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |
23,459
|
23,981
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
(3,468)
|
(3,392)
|
| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value |
23,459
|
23,981
|
| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss |
(3,468)
|
(3,392)
|
| Collateralized Mortgage Backed Securities [Member] |
|
|
| Investments, Unrealized Loss Position [Line Items] |
|
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months |
600,352
|
56,942
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
5,748
|
130
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer |
263,609
|
286,606
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
35,807
|
36,217
|
| Debt Securities, Available-for-Sale, Unrealized Loss Position |
863,961
|
343,548
|
| Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |
(41,555)
|
(36,347)
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |
0
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
0
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |
5,333
|
5,589
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
(513)
|
(499)
|
| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value |
5,333
|
5,589
|
| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss |
(513)
|
(499)
|
| Obligations of state and other political subdivisions |
|
|
| Investments, Unrealized Loss Position [Line Items] |
|
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months |
114,099
|
71,825
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
2,566
|
511
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer |
453,419
|
466,766
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
92,109
|
88,998
|
| Debt Securities, Available-for-Sale, Unrealized Loss Position |
567,518
|
538,591
|
| Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |
(94,675)
|
(89,509)
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |
3,402
|
2,273
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
(17)
|
(4)
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |
1,167
|
1,217
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
(187)
|
(175)
|
| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value |
4,569
|
3,490
|
| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss |
(204)
|
(179)
|
| Asset-backed Securities [Member] |
|
|
| Investments, Unrealized Loss Position [Line Items] |
|
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months |
230,177
|
70,967
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
1,068
|
48
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer |
47,549
|
54,351
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
14,418
|
13,591
|
| Debt Securities, Available-for-Sale, Unrealized Loss Position |
277,726
|
125,318
|
| Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |
(15,486)
|
(13,639)
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |
0
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
0
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |
0
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
0
|
0
|
| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value |
0
|
0
|
| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss |
0
|
0
|
| Other securities |
|
|
| Investments, Unrealized Loss Position [Line Items] |
|
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months |
27,940
|
7,321
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
171
|
54
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer |
69,559
|
76,141
|
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
2,734
|
7,135
|
| Debt Securities, Available-for-Sale, Unrealized Loss Position |
97,499
|
83,462
|
| Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |
(2,905)
|
(7,189)
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |
0
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
0
|
0
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |
8,377
|
16,549
|
| Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
(123)
|
(201)
|
| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value |
8,377
|
16,549
|
| Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss |
$ (123)
|
$ (201)
|