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DEBT SECURITIES - Continuous Unrealized Loss on Investment (Details) $ in Thousands | Mar. 31, 2026 USD ($) position | Dec. 31, 2025 USD ($) position
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Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
AFS, Less than 12 months, Fair value | $ 1,198,975 | $ 352,209
AFS, Less than 12 months, Gross unrealized losses | 8,650 | 1,247
AFS, Twelve months or more, Fair value | 580,071 | 608,420
AFS, Twelve months or more, Gross unrealized losses | 39,568 | 38,123
AFS, Total, Fair value | 1,779,046 | 960,629
AFS, Total, Gross unrealized losses | $ 48,218 | $ 39,370
Number of securities with unrealized losses |  |
AFS, Less than 12 months, Number of positions with unrealized losses | position | 261 | 83
AFS, 12 months or more, Number of positions with unrealized losses | position | 228 | 240
AFS, Total , Number of positions with unrealized losses | position | 489 | 323
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
AFS, Less than 12 months, Fair value | $ 124,671 | $ 27,015
AFS, Less than 12 months, Gross unrealized losses | 1,214 | 151
AFS, Twelve months or more, Fair value | 22,600 | 30,244
AFS, Twelve months or more, Gross unrealized losses | 507 | 498
AFS, Total, Fair value | 147,271 | 57,259
AFS, Total, Gross unrealized losses | 1,721 | 649
Mortgage-backed securities - residential |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
AFS, Less than 12 months, Fair value | 769,984 | 72,234
AFS, Less than 12 months, Gross unrealized losses | 5,785 | 384
AFS, Twelve months or more, Fair value | 375,934 | 393,915
AFS, Twelve months or more, Gross unrealized losses | 25,586 | 23,941
AFS, Total, Fair value | 1,145,918 | 466,149
AFS, Total, Gross unrealized losses | 31,371 | 24,325
Mortgage-backed securities - commercial |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
AFS, Less than 12 months, Fair value | 96,247 | 106,225
AFS, Less than 12 months, Gross unrealized losses | 675 | 405
AFS, Twelve months or more, Fair value | 153,402 | 156,600
AFS, Twelve months or more, Gross unrealized losses | 11,610 | 11,345
AFS, Total, Fair value | 249,649 | 262,825
AFS, Total, Gross unrealized losses | 12,285 | 11,750
Collateralized loan obligations |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
AFS, Less than 12 months, Fair value | 179,708 | 138,315
AFS, Less than 12 months, Gross unrealized losses | 792 | 185
AFS, Twelve months or more, Fair value | 0 | 0
AFS, Twelve months or more, Gross unrealized losses | 0 | 0
AFS, Total, Fair value | 179,708 | 138,315
AFS, Total, Gross unrealized losses | 792 | 185
Corporate bonds |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
AFS, Less than 12 months, Fair value | 1,072 | 3,543
AFS, Less than 12 months, Gross unrealized losses | 13 | 101
AFS, Twelve months or more, Fair value | 28,135 | 27,661
AFS, Twelve months or more, Gross unrealized losses | 1,865 | 2,339
AFS, Total, Fair value | 29,207 | 31,204
AFS, Total, Gross unrealized losses | 1,878 | 2,440
U.S. Treasury securities |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
AFS, Less than 12 months, Fair value | 20,536 |
AFS, Less than 12 months, Gross unrealized losses | 112 |
AFS, Twelve months or more, Fair value | 0 |
AFS, Twelve months or more, Gross unrealized losses | 0 |
AFS, Total, Fair value | 20,536 |
AFS, Total, Gross unrealized losses | 112 |
Agency debentures |  |
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
AFS, Less than 12 months, Fair value | 6,757 | 4,877
AFS, Less than 12 months, Gross unrealized losses | 59 | 21
AFS, Twelve months or more, Fair value | 0 | 0
AFS, Twelve months or more, Gross unrealized losses | 0 | 0
AFS, Total, Fair value | 6,757 | 4,877
AFS, Total, Gross unrealized losses | $ 59 | $ 21

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