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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 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Approximate Fair Value |  |
Less Than 12 Months | $ 484,602 | $ 216,829
12 Months or Longer | 15,325 | 16,009
Total | 499,927 | 232,838
Unrealized Losses |  |
Less Than 12 Months | (7,917) | (1,428)
12 Months or Longer | (177) | (47)
Total | (8,094) | (1,475)
U.S. Government-Sponsored Agencies [Member] |  |
Approximate Fair Value |  |
Less Than 12 Months | 171,484 | 73,769
12 Months or Longer | 0 | 0
Total | 171,484 | 73,769
Unrealized Losses |  |
Less Than 12 Months | (3,216) | (655)
12 Months or Longer | 0 | 0
Total | (3,216) | (655)
Mortgage-Backed Securities-Residential [Member] |  |
Approximate Fair Value |  |
Less Than 12 Months | 276,658 | 103,340
12 Months or Longer | 15,325 | 13,914
Total | 291,983 | 117,254
Unrealized Losses |  |
Less Than 12 Months | (4,292) | (430)
12 Months or Longer | (177) | (31)
Total | (4,469) | (461)
SBA Pool Securities [Member] |  |
Approximate Fair Value |  |
Less Than 12 Months | 36,460 | 39,720
12 Months or Longer | 0 | 2,095
Total | 36,460 | 41,815
Unrealized Losses |  |
Less Than 12 Months | (409) | (343)
12 Months or Longer | 0 | (16)
Total | $ (409) | $ (359)

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