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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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