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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