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INVESTMENT SECURITIES (Unrealized Gains and Losses by Category) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Securities Available-for-Sale, Amortized Cost |  |
12 months or more | $ 1,054,981 | $ 171,011
Less than 12 months | 595,458 | 1,323,800
Amortized Cost | 1,650,440 | 1,494,811
Held-to-Maturity, Amortized Cost |  |
12 months or more | 519,145 |
Total | 519,145 | 535,070
Securities Available-for-Sale, Unrealized Loss |  |
12 months or more | 140,078 | 33,027
Less than 12 months | 10,780 | 78,004
Total | 150,859 | 111,031
Held-to-Maturity, Unrealized Loss |  |
12 months or more | 77,386 |
Total | 77,386 | 65,884
Securities Available-for-Sale, Fair Value |  |
12 months or more | 914,903 | 137,984
Less than 12 months | 584,678 | 1,245,796
Total | 1,499,581 | 1,383,780
Held-to-Maturity, Fair Value |  |
12 months or more | 441,759 |
Total | 441,759 | 469,186
FNMA and FHLMC certificates |  |
Securities Available-for-Sale, Amortized Cost |  |
12 months or more | 750,699 | 88,600
Less than 12 months | 510,701 | 745,566
Amortized Cost | 1,261,401 | 834,166
Held-to-Maturity, Amortized Cost |  |
12 months or more | 320,249 | 337,435
Total | 320,249 | 337,435
Securities Available-for-Sale, Unrealized Loss |  |
12 months or more | 91,423 | 18,989
Less than 12 months | 8,257 | 50,657
Total | 99,681 | 69,646
Held-to-Maturity, Unrealized Loss |  |
12 months or more | 74,607 | 62,358
Total | 74,607 | 62,358
Securities Available-for-Sale, Fair Value |  |
12 months or more | 659,276 | 69,611
Less than 12 months | 502,444 | 694,909
Total | 1,161,720 | 764,520
Held-to-Maturity, Fair Value |  |
12 months or more | 245,642 | 275,077
Total | 245,642 | 275,077
GNMA Securities |  |
Securities Available-for-Sale, Amortized Cost |  |
12 months or more | 292,915 | 82,074
Less than 12 months | 84,757 | 251,835
Amortized Cost | 377,672 | 333,909
Securities Available-for-Sale, Unrealized Loss |  |
12 months or more | 48,099 | 14,031
Less than 12 months | 2,523 | 24,838
Total | 50,622 | 38,869
Securities Available-for-Sale, Fair Value |  |
12 months or more | 244,816 | 68,043
Less than 12 months | 82,234 | 226,997
Total | 327,050 | 295,040
CMOs issued by US Government-sponsored agencies |  |
Securities Available-for-Sale, Amortized Cost |  |
12 months or more | 11,228 | 337
Less than 12 months |  | 15,297
Amortized Cost | 11,228 | 15,634
Securities Available-for-Sale, Unrealized Loss |  |
12 months or more | 553 | 7
Less than 12 months |  | 776
Total | 553 | 783
Securities Available-for-Sale, Fair Value |  |
12 months or more | 10,675 | 330
Less than 12 months |  | 14,521
Total | 10,675 | 14,851
Other debt securities |  |
Securities Available-for-Sale, Amortized Cost |  |
12 months or more | 139 |
Less than 12 months |  | 240
Amortized Cost | 139 | 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 | 136 |
Less than 12 months |  | 236
Total | 136 | 236
US Treasury securities |  |
Securities Available-for-Sale, Amortized Cost |  |
Less than 12 months |  | 310,862
Amortized Cost |  | 310,862
Held-to-Maturity, Amortized Cost |  |
12 months or more | 198,896 |
Less than 12 months |  | 197,635
Total | 198,896 | 197,635
Securities Available-for-Sale, Unrealized Loss |  |
Less than 12 months |  | 1,729
Total |  | 1,729
Held-to-Maturity, Unrealized Loss |  |
12 months or more | 2,779 |
Less than 12 months |  | 3,526
Total | 2,779 | 3,526
Securities Available-for-Sale, Fair Value |  |
Less than 12 months |  | 309,133
Total |  | 309,133
Held-to-Maturity, Fair Value |  |
12 months or more | 196,117 |
Less than 12 months |  | 194,109
Total | $ 196,117 | $ 194,109

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