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INVESTMENT SECURITIES (Unrealized Gains and Losses by Category) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Securities Available-for-Sale, Amortized Cost
12 months or more	$ 1,017,108	$ 171,011
Less than 12 months	114,099	1,323,800
Amortized Cost	1,131,207	1,494,811
Securities Available-for-Sale, Unrealized Loss
12 months or more	91,590	33,027
Less than 12 months	383	78,004
Total	91,973	111,031
Securities Available-for-Sale, Fair Value
12 months or more	925,518	137,984
Less than 12 months	113,716	1,245,796
Total	1,039,234	1,383,780
FNMA and FHLMC certificates
Securities Available-for-Sale, Amortized Cost
12 months or more	731,334	88,600
Less than 12 months	106,235	745,566
Amortized Cost	837,569	834,166
Securities Available-for-Sale, Unrealized Loss
12 months or more	56,847	18,989
Less than 12 months	331	50,657
Total	57,178	69,646
Securities Available-for-Sale, Fair Value
12 months or more	674,487	69,611
Less than 12 months	105,904	694,909
Total	780,391	764,520
GNMA certificates
Securities Available-for-Sale, Amortized Cost
12 months or more	275,669	82,074
Less than 12 months	7,864	251,835
Amortized Cost	283,533	333,909
Securities Available-for-Sale, Unrealized Loss
12 months or more	34,364	14,031
Less than 12 months	52	24,838
Total	34,416	38,869
Securities Available-for-Sale, Fair Value
12 months or more	241,305	68,043
Less than 12 months	7,812	226,997
Total	249,117	295,040
CMOs issued by US Government-sponsored agencies
Securities Available-for-Sale, Amortized Cost
12 months or more	9,986	337
Less than 12 months		15,297
Amortized Cost	9,986	15,634
Securities Available-for-Sale, Unrealized Loss
12 months or more	376	7
Less than 12 months		776
Total	376	783
Securities Available-for-Sale, Fair Value
12 months or more	9,610	330
Less than 12 months		14,521
Total	9,610	14,851
Other debt securities
Securities Available-for-Sale, Amortized Cost
12 months or more	119
Less than 12 months		240
Amortized Cost	119	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	116
Less than 12 months		236
Total	$ 116	236
US Treasury securities
Securities Available-for-Sale, Amortized Cost
Less than 12 months		310,862
Amortized Cost		310,862
Securities Available-for-Sale, Unrealized Loss
Less than 12 months		1,729
Total		1,729
Securities Available-for-Sale, Fair Value
Less than 12 months		309,133
Total		$ 309,133

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