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INVESTMENT SECURITIES AVAILABLE FOR SALE (Schedule of Available for Sale Securities in Continuous Unrealized Loss Position and Approximate Fair Value of Investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Approximate Fair Value
Less Than 12 Months	$ 538,938	$ 216,829
12 Months or Longer	8,591	16,009
Total	547,529	232,838
Unrealized Losses
Less Than 12 Months	(17,235)	(1,428)
12 Months or Longer	(25)	(47)
Total	(17,260)	(1,475)
U.S. Government-Sponsored Agencies [Member]
Approximate Fair Value
Less Than 12 Months	211,882	73,769
12 Months or Longer	0	0
Total	211,882	73,769
Unrealized Losses
Less Than 12 Months	(7,862)	(655)
12 Months or Longer	0	0
Total	(7,862)	(655)
Mortgage-Backed Securities-Residential [Member]
Approximate Fair Value
Less Than 12 Months	290,133	103,340
12 Months or Longer	6,534	13,914
Total	296,667	117,254
Unrealized Losses
Less Than 12 Months	(8,244)	(430)
12 Months or Longer	(10)	(31)
Total	(8,254)	(461)
SBA Pool Securities [Member]
Approximate Fair Value
Less Than 12 Months	36,923	39,720
12 Months or Longer	2,057	2,095
Total	38,980	41,815
Unrealized Losses
Less Than 12 Months	(1,129)	(343)
12 Months or Longer	(15)	(16)
Total	$ (1,144)	$ (359)

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