INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands |
Jun. 30, 2025 |
Dec. 31, 2024 |
Investments, Unrealized Loss Position [Line Items] |
|
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months |
$ 474,947
|
$ 620,715
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
5,440
|
11,525
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer |
1,671,821
|
1,911,161
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
283,922
|
320,809
|
Debt Securities, Available-for-Sale, Unrealized Loss Position |
2,146,768
|
2,531,876
|
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |
(289,362)
|
(332,334)
|
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |
2,273
|
3,111
|
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
(9)
|
(33)
|
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |
60,440
|
63,315
|
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
(6,788)
|
(7,980)
|
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value |
62,713
|
66,426
|
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss |
(6,797)
|
(8,013)
|
U.S. Treasuries |
|
|
Investments, Unrealized Loss Position [Line Items] |
|
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months |
0
|
0
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
0
|
0
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer |
94
|
90
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
6
|
9
|
Debt Securities, Available-for-Sale, Unrealized Loss Position |
94
|
90
|
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |
(6)
|
(9)
|
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 |
0
|
0
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
0
|
0
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer |
65,503
|
71,678
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
7,384
|
11,546
|
Debt Securities, Available-for-Sale, Unrealized Loss Position |
65,503
|
71,678
|
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |
(7,384)
|
(11,546)
|
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 |
274,048
|
417,516
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
4,022
|
9,130
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer |
476,547
|
503,321
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
79,271
|
95,078
|
Debt Securities, Available-for-Sale, Unrealized Loss Position |
750,595
|
920,837
|
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |
(83,293)
|
(104,208)
|
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 |
14,186
|
26,516
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
45
|
67
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer |
217,355
|
286,589
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
17,802
|
25,314
|
Debt Securities, Available-for-Sale, Unrealized Loss Position |
231,541
|
313,105
|
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |
(17,847)
|
(25,381)
|
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 |
25,430
|
25,990
|
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
(3,915)
|
(4,454)
|
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value |
25,430
|
25,990
|
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss |
(3,915)
|
(4,454)
|
Collateralized Mortgage Backed Securities [Member] |
|
|
Investments, Unrealized Loss Position [Line Items] |
|
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months |
42,687
|
120,670
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
769
|
1,776
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer |
280,115
|
296,813
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
41,730
|
50,823
|
Debt Securities, Available-for-Sale, Unrealized Loss Position |
322,802
|
417,483
|
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |
(42,499)
|
(52,599)
|
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 |
6,017
|
6,219
|
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
(580)
|
(788)
|
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value |
6,017
|
6,219
|
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss |
(580)
|
(788)
|
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 |
10,699
|
19,636
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
342
|
351
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer |
452,505
|
478,083
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
116,004
|
109,553
|
Debt Securities, Available-for-Sale, Unrealized Loss Position |
463,204
|
497,719
|
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |
(116,346)
|
(109,904)
|
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value |
2,273
|
3,111
|
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
(9)
|
(33)
|
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value |
2,284
|
2,288
|
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
(252)
|
(306)
|
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value |
4,557
|
5,399
|
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss |
(261)
|
(339)
|
Asset-backed Securities [Member] |
|
|
Investments, Unrealized Loss Position [Line Items] |
|
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months |
133,327
|
26,389
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
262
|
189
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer |
65,917
|
159,135
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
13,747
|
22,190
|
Debt Securities, Available-for-Sale, Unrealized Loss Position |
199,244
|
185,524
|
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |
(14,009)
|
(22,379)
|
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 |
0
|
9,988
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |
0
|
12
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer |
113,785
|
115,452
|
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
7,978
|
6,296
|
Debt Securities, Available-for-Sale, Unrealized Loss Position |
113,785
|
125,440
|
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |
(7,978)
|
(6,308)
|
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 |
26,709
|
28,818
|
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |
(2,041)
|
(2,432)
|
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value |
26,709
|
28,818
|
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Accumulated Loss |
$ (2,041)
|
$ (2,432)
|