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INVESTMENT SECURITIES (Unrealized Gains and Losses by Category) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Securities Available-for-Sale, Amortized Cost |  |
12 months or more | $ 915,624 | $ 1,017,108
Less than 12 months |  | 114,099
Amortized Cost |  | 1,131,207
Securities Available-for-Sale, Unrealized Loss |  |
12 months or more | 70,367 | 91,590
Less than 12 months |  | 383
Total |  | 91,973
Securities Available-for-Sale, Fair Value |  |
12 months or more | 845,257 | 925,518
Less than 12 months |  | 113,716
Total |  | 1,039,234
FNMA and FHLMC certificates |  |
Securities Available-for-Sale, Amortized Cost |  |
12 months or more | 663,730 | 731,334
Less than 12 months |  | 106,235
Amortized Cost |  | 837,569
Securities Available-for-Sale, Unrealized Loss |  |
12 months or more | 40,594 | 56,847
Less than 12 months |  | 331
Total |  | 57,178
Securities Available-for-Sale, Fair Value |  |
12 months or more | 623,136 | 674,487
Less than 12 months |  | 105,904
Total |  | 780,391
GNMA certificates |  |
Securities Available-for-Sale, Amortized Cost |  |
12 months or more | 245,156 | 275,669
Less than 12 months |  | 7,864
Amortized Cost |  | 283,533
Securities Available-for-Sale, Unrealized Loss |  |
12 months or more | 29,616 | 34,364
Less than 12 months |  | 52
Total |  | 34,416
Securities Available-for-Sale, Fair Value |  |
12 months or more | 215,540 | 241,305
Less than 12 months |  | 7,812
Total |  | 249,117
CMOs issued by US Government-sponsored agencies |  |
Securities Available-for-Sale, Amortized Cost |  |
12 months or more | 6,670 | 9,986
Amortized Cost |  | 9,986
Securities Available-for-Sale, Unrealized Loss |  |
12 months or more | 156 | 376
Total |  | 376
Securities Available-for-Sale, Fair Value |  |
12 months or more | 6,514 | 9,610
Total |  | 9,610
Other debt securities |  |
Securities Available-for-Sale, Amortized Cost |  |
12 months or more | 68 | 119
Amortized Cost |  | 119
Securities Available-for-Sale, Unrealized Loss |  |
12 months or more | 1 | 3
Total |  | 3
Securities Available-for-Sale, Fair Value |  |
12 months or more | $ 67 | 116
Total |  | $ 116

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