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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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