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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	Sep. 30, 2021	Dec. 31, 2020
Approximate Fair Value
Less Than 12 Months	$ 572,206	$ 216,829
12 Months or Longer	39,824	16,009
Total	612,030	232,838
Unrealized Losses
Less Than 12 Months	(11,554)	(1,428)
12 Months or Longer	(1,148)	(47)
Total	(12,702)	(1,475)
U.S. Government-Sponsored Agencies [Member]
Approximate Fair Value
Less Than 12 Months	259,893	73,769
12 Months or Longer	14,540	0
Total	274,433	73,769
Unrealized Losses
Less Than 12 Months	(5,209)	(655)
12 Months or Longer	(460)	0
Total	(5,669)	(655)
Mortgage-Backed Securities-Residential [Member]
Approximate Fair Value
Less Than 12 Months	288,682	103,340
12 Months or Longer	14,707	13,914
Total	303,389	117,254
Unrealized Losses
Less Than 12 Months	(6,015)	(430)
12 Months or Longer	(168)	(31)
Total	(6,183)	(461)
SBA Pool Securities [Member]
Approximate Fair Value
Less Than 12 Months	23,631	39,720
12 Months or Longer	10,577	2,095
Total	34,208	41,815
Unrealized Losses
Less Than 12 Months	(330)	(343)
12 Months or Longer	(520)	(16)
Total	$ (850)	$ (359)

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