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INVESTMENT SECURITIES (Investment Securities by Contractual Maturity - HTM) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 525,413	$ 535,070
Gross Unrealized Gains	0	0
Gross Unrealized Losses	64,035	65,884
Fair Value	$ 461,378	$ 469,186
Weighted Average Yield	2.34%	2.30%
Due less than 1 year | Investment securities | US Treasury securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 198,478
Gross Unrealized Gains	0
Gross Unrealized Losses	3,697
Fair Value	$ 194,781
Weighted Average Yield	3.34%
Due from 1 to 5 years | Investment securities | US Treasury securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		$ 197,635
Gross Unrealized Gains		0
Gross Unrealized Losses		3,526
Fair Value		$ 194,109
Weighted Average Yield		3.36%
Due after 10 years | Mortgage-backed securities | FNMA and FHLMC certificates
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 326,935	$ 337,435
Gross Unrealized Gains	0	0
Gross Unrealized Losses	60,338	62,358
Fair Value	$ 266,597	$ 275,077
Weighted Average Yield	1.72%	1.71%

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