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INVESTMENT SECURITIES (Unrealized Gains and Losses by Category) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Securities Available-for-Sale, Amortized Cost |  |
12 months or more | $ 171,011 |
Less than 12 months | 1,323,800 | $ 98,962
Total | 1,494,811 |
Held-to-Maturity, Amortized Cost |  |
Less than 12 months | 197,635 |
Total | 535,070 |
Securities Available-for-Sale, Unrealized Loss |  |
12 months or more | 33,027 |
Less than 12 months | 78,004 | 3,400
Total | 111,031 |
Held-to-Maturity, Unrealized Loss |  |
Less than 12 months | 3,526 |
Total | 65,884 |
Securities Available-for-Sale, Fair Value |  |
12 months or more | 137,984 | 0
Less than 12 months | 1,245,796 | 95,562
Total | 1,383,780 |
Held-to-Maturity, Fair Value |  |
Less than 12 months | 194,109 |
Total | 469,186 |
CMOs issued by US Government-sponsored agencies |  |
Securities Available-for-Sale, Amortized Cost |  |
12 months or more | 337 |
Less than 12 months | 15,297 | 500
Total | 15,634 |
Securities Available-for-Sale, Unrealized Loss |  |
12 months or more | 7 |
Less than 12 months | 776 | 1
Total | 783 |
Securities Available-for-Sale, Fair Value |  |
12 months or more | 330 |
Less than 12 months | 14,521 | 499
Total | 14,851 |
FNMA and FHLMC certificates |  |
Securities Available-for-Sale, Amortized Cost |  |
12 months or more | 88,600 |
Less than 12 months | 745,566 | 93,440
Total | 834,166 |
Held-to-Maturity, Amortized Cost |  |
12 months or more | 337,435 |
Less than 12 months | 0 | 367,507
Total | 337,435 |
Securities Available-for-Sale, Unrealized Loss |  |
12 months or more | 18,989 |
Less than 12 months | 50,657 | 3,200
Total | 69,646 |
Held-to-Maturity, Unrealized Loss |  |
12 months or more | 62,358 |
Less than 12 months | 0 | 3,854
Total | 62,358 |
Securities Available-for-Sale, Fair Value |  |
12 months or more | 69,611 |
Less than 12 months | 694,909 | 90,240
Total | 764,520 |
Held-to-Maturity, Fair Value |  |
12 months or more | 275,077 |
Less than 12 months | 0 | 363,653
Total | 275,077 |
GNMA Securities |  |
Securities Available-for-Sale, Amortized Cost |  |
12 months or more | 82,074 |
Less than 12 months | 251,835 | 5,022
Total | 333,909 |
Securities Available-for-Sale, Unrealized Loss |  |
12 months or more | 14,031 |
Less than 12 months | 24,838 | 199
Total | 38,869 |
Securities Available-for-Sale, Fair Value |  |
12 months or more | 68,043 |
Less than 12 months | 226,997 | $ 4,823
Total | 295,040 |
US Treasury securities |  |
Securities Available-for-Sale, Amortized Cost |  |
Less than 12 months | 310,862 |
Total | 310,862 |
Held-to-Maturity, Amortized Cost |  |
Less than 12 months | 197,635 |
Total | 197,635 |
Securities Available-for-Sale, Unrealized Loss |  |
Less than 12 months | 1,729 |
Total | 1,729 |
Held-to-Maturity, Unrealized Loss |  |
Less than 12 months | 3,526 |
Total | 3,526 |
Securities Available-for-Sale, Fair Value |  |
Less than 12 months | 309,133 |
Total | 309,133 |
Held-to-Maturity, Fair Value |  |
Less than 12 months | 194,109 |
Total | 194,109 |
Other debt securities |  |
Securities Available-for-Sale, Amortized Cost |  |
Less than 12 months | 240 |
Total | 240 |
Securities Available-for-Sale, Unrealized Loss |  |
Less than 12 months | 4 |
Total | 4 |
Securities Available-for-Sale, Fair Value |  |
Less than 12 months | 236 |
Total | $ 236 |

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