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INVESTMENT SECURITIES (Schedule of Available for Sale and Held to Maturity Securities with Continuous Unrealized Losses and Approximate Fair Value of Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Available for Sale Securities, Fair Value |  |
Less Than 12 Months | $ 530,647 | $ 216,829
12 Months or Longer | 73,051 | 16,009
Total | 603,698 | 232,838
Available for Sale Securities, Unrealized Losses |  |
Less Than 12 Months | (14,478) | (1,428)
12 Months or Longer | (2,383) | (47)
Total | (16,861) | (1,475)
Held to Maturity Securities, Fair Value |  |
Less Than 12 Months | 73,282 |
12 Months or Longer | 0 |
Total | 73,282 |
Held to Maturity Securities, Unrealized Losses |  |
Less Than 12 Months | (294) |
12 Months or Longer | 0 |
Total | (294) |
Approximate Fair Value |  |
Fair Value, Less than 12 months | 603,929 |
Fair Value, 12 months or longer | 73,051 |
Fair Value | 676,980 |
Unrealized Losses |  |
Unrealized Losses, Less than 12 months | (14,772) |
Unrealized Losses, 12 months or longer | (2,383) |
Unrealized Losses | (17,155) |
12 Months or Longer | 73,051 | 16,009
Total | 603,698 | 232,838
U.S. Government-Sponsored Agencies [Member] |  |
Available for Sale Securities, Fair Value |  |
Less Than 12 Months | 243,187 | 73,769
12 Months or Longer | 29,034 | 0
Total | 272,221 | 73,769
Available for Sale Securities, Unrealized Losses |  |
Less Than 12 Months | (6,858) | (655)
12 Months or Longer | (966) | 0
Total | (7,824) | (655)
Held to Maturity Securities, Fair Value |  |
Less Than 12 Months | 24,975 |
12 Months or Longer | 0 |
Total | 24,975 |
Held to Maturity Securities, Unrealized Losses |  |
Less Than 12 Months | (25) |
12 Months or Longer | 0 |
Total | (25) |
Unrealized Losses |  |
12 Months or Longer | 29,034 | 0
Total | 272,221 | 73,769
Mortgage-Backed Securities-Residential [Member] |  |
Available for Sale Securities, Fair Value |  |
Less Than 12 Months | 265,403 | 103,340
12 Months or Longer | 33,455 | 13,914
Total | 298,858 | 117,254
Available for Sale Securities, Unrealized Losses |  |
Less Than 12 Months | (7,053) | (430)
12 Months or Longer | (884) | (31)
Total | (7,937) | (461)
Held to Maturity Securities, Fair Value |  |
Less Than 12 Months | 48,307 |
12 Months or Longer | 0 |
Total | 48,307 |
Held to Maturity Securities, Unrealized Losses |  |
Less Than 12 Months | (269) |
12 Months or Longer | 0 |
Total | (269) |
Unrealized Losses |  |
12 Months or Longer | 33,455 | 13,914
Total | 298,858 | 117,254
SBA Pool Securities [Member] |  |
Available for Sale Securities, Fair Value |  |
Less Than 12 Months | 22,057 | 39,720
12 Months or Longer | 10,562 | 2,095
Total | 32,619 | 41,815
Available for Sale Securities, Unrealized Losses |  |
Less Than 12 Months | (567) | (343)
12 Months or Longer | (533) | (16)
Total | (1,100) | (359)
Unrealized Losses |  |
12 Months or Longer | 10,562 | 2,095
Total | $ 32,619 | $ 41,815

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