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INVESTMENT SECURITIES (Unrealized Gains and Losses by Category) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Securities Available-for-Sale, Amortized Cost |  |
12 months or more | $ 1,017,108 | $ 171,011
Less than 12 months | 114,099 | 1,323,800
Amortized Cost | 1,131,207 | 1,494,811
Securities Available-for-Sale, Unrealized Loss |  |
12 months or more | 91,590 | 33,027
Less than 12 months | 383 | 78,004
Total | 91,973 | 111,031
Securities Available-for-Sale, Fair Value |  |
12 months or more | 925,518 | 137,984
Less than 12 months | 113,716 | 1,245,796
Total | 1,039,234 | 1,383,780
FNMA and FHLMC certificates |  |
Securities Available-for-Sale, Amortized Cost |  |
12 months or more | 731,334 | 88,600
Less than 12 months | 106,235 | 745,566
Amortized Cost | 837,569 | 834,166
Securities Available-for-Sale, Unrealized Loss |  |
12 months or more | 56,847 | 18,989
Less than 12 months | 331 | 50,657
Total | 57,178 | 69,646
Securities Available-for-Sale, Fair Value |  |
12 months or more | 674,487 | 69,611
Less than 12 months | 105,904 | 694,909
Total | 780,391 | 764,520
GNMA certificates |  |
Securities Available-for-Sale, Amortized Cost |  |
12 months or more | 275,669 | 82,074
Less than 12 months | 7,864 | 251,835
Amortized Cost | 283,533 | 333,909
Securities Available-for-Sale, Unrealized Loss |  |
12 months or more | 34,364 | 14,031
Less than 12 months | 52 | 24,838
Total | 34,416 | 38,869
Securities Available-for-Sale, Fair Value |  |
12 months or more | 241,305 | 68,043
Less than 12 months | 7,812 | 226,997
Total | 249,117 | 295,040
CMOs issued by US Government-sponsored agencies |  |
Securities Available-for-Sale, Amortized Cost |  |
12 months or more | 9,986 | 337
Less than 12 months |  | 15,297
Amortized Cost | 9,986 | 15,634
Securities Available-for-Sale, Unrealized Loss |  |
12 months or more | 376 | 7
Less than 12 months |  | 776
Total | 376 | 783
Securities Available-for-Sale, Fair Value |  |
12 months or more | 9,610 | 330
Less than 12 months |  | 14,521
Total | 9,610 | 14,851
Other debt securities |  |
Securities Available-for-Sale, Amortized Cost |  |
12 months or more | 119 |
Less than 12 months |  | 240
Amortized Cost | 119 | 240
Securities Available-for-Sale, Unrealized Loss |  |
12 months or more | 3 |
Less than 12 months |  | 4
Total | 3 | 4
Securities Available-for-Sale, Fair Value |  |
12 months or more | 116 |
Less than 12 months |  | 236
Total | $ 116 | 236
US Treasury securities |  |
Securities Available-for-Sale, Amortized Cost |  |
Less than 12 months |  | 310,862
Amortized Cost |  | 310,862
Securities Available-for-Sale, Unrealized Loss |  |
Less than 12 months |  | 1,729
Total |  | 1,729
Securities Available-for-Sale, Fair Value |  |
Less than 12 months |  | 309,133
Total |  | $ 309,133

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