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INVESTMENT SECURITIES (Unrealized Gains and Losses by Category) (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Securities Available-for-Sale, Fair Value    
Less than 12 months $ 471,516 $ 875,760
12 months or more 777,051 786,686
Total 1,248,567 1,662,446
Securities Available-for-Sale, Unrealized Loss    
Less than 12 months 5,077 15,008
12 months or more 83,315 100,536
Total 88,392 115,544
FNMA and FHLMC certificates    
Securities Available-for-Sale, Fair Value    
Less than 12 months 406,272 791,987
12 months or more 571,505 579,727
Total 977,777 1,371,714
Securities Available-for-Sale, Unrealized Loss    
Less than 12 months 3,984 12,989
12 months or more 48,588 61,462
Total 52,572 74,451
GNMA certificates    
Securities Available-for-Sale, Fair Value    
Less than 12 months 65,244 83,773
12 months or more 200,797 201,320
Total 266,041 285,093
Securities Available-for-Sale, Unrealized Loss    
Less than 12 months 1,093 2,019
12 months or more 34,633 38,945
Total 35,726 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 4,749 5,639
Total 4,749 5,639
Securities Available-for-Sale, Unrealized Loss    
Less than 12 months 0 0
12 months or more 94 129
Total $ 94 $ 129