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INVESTMENT SECURITIES (Unrealized Gains and Losses by Category) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Securities Available-for-Sale, Fair Value    
Less than 12 months $ 109,570 $ 875,760
12 months or more 782,657 786,686
Total 892,227 1,662,446
Securities Available-for-Sale, Unrealized Loss    
Less than 12 months 713 15,008
12 months or more 68,574 100,536
Total 69,287 115,544
FNMA and FHLMC certificates    
Securities Available-for-Sale, Fair Value    
Less than 12 months 99,560 791,987
12 months or more 553,694 579,727
Total 653,254 1,371,714
Securities Available-for-Sale, Unrealized Loss    
Less than 12 months 412 12,989
12 months or more 36,865 61,462
Total 37,277 74,451
GNMA certificates    
Securities Available-for-Sale, Fair Value    
Less than 12 months 10,010 83,773
12 months or more 225,797 201,320
Total 235,807 285,093
Securities Available-for-Sale, Unrealized Loss    
Less than 12 months 301 2,019
12 months or more 31,666 38,945
Total 31,967 40,964
CMOs issued by US Government-sponsored agencies    
Securities Available-for-Sale, Fair Value    
Less than 12 months 0 0
12 months or more 3,166 5,639
Total 3,166 5,639
Securities Available-for-Sale, Unrealized Loss    
Less than 12 months 0 0
12 months or more 43 129
Total $ 43 $ 129