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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