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INVESTMENT SECURITIES (Unrealized Gains and Losses by Category) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Securities Available-for-Sale, Amortized Cost
12 months or more	$ 1,035,112	$ 1,017,108
Less than 12 months	226,203	114,099
Amortized Cost	1,261,315	1,131,207
Securities Available-for-Sale, Unrealized Loss
12 months or more	103,877	91,590
Less than 12 months	2,874	383
Total	106,751	91,973
Securities Available-for-Sale, Fair Value
12 months or more	931,235	925,518
Less than 12 months	223,329	113,716
Total	1,154,564	1,039,234
FNMA and FHLMC certificates
Securities Available-for-Sale, Amortized Cost
12 months or more	754,641	731,334
Less than 12 months	210,076	106,235
Amortized Cost	964,717	837,569
Securities Available-for-Sale, Unrealized Loss
12 months or more	65,319	56,847
Less than 12 months	2,778	331
Total	68,097	57,178
Securities Available-for-Sale, Fair Value
12 months or more	689,322	674,487
Less than 12 months	207,298	105,904
Total	896,620	780,391
GNMA certificates
Securities Available-for-Sale, Amortized Cost
12 months or more	271,543	275,669
Less than 12 months	16,127	7,864
Amortized Cost	287,670	283,533
Securities Available-for-Sale, Unrealized Loss
12 months or more	38,197	34,364
Less than 12 months	96	52
Total	38,293	34,416
Securities Available-for-Sale, Fair Value
12 months or more	233,346	241,305
Less than 12 months	16,031	7,812
Total	249,377	249,117
CMOs issued by US Government-sponsored agencies
Securities Available-for-Sale, Amortized Cost
12 months or more	8,829	9,986
Amortized Cost	8,829	9,986
Securities Available-for-Sale, Unrealized Loss
12 months or more	359	376
Total	359	376
Securities Available-for-Sale, Fair Value
12 months or more	8,470	9,610
Total	8,470	9,610
Other debt securities
Securities Available-for-Sale, Amortized Cost
12 months or more	99	119
Amortized Cost	99	119
Securities Available-for-Sale, Unrealized Loss
12 months or more	2	3
Total	2	3
Securities Available-for-Sale, Fair Value
12 months or more	97	116
Total	$ 97	$ 116

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