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INVESTMENT SECURITIES (Schedule of Amortized Cost and Approximate Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Securities Available for Sale: |  |
Amortized Cost | $ 654,287 | $ 809,687
Gross Unrealized Gains | 383 | 3,927
Gross Unrealized Losses | (53,507) | (16,861)
Fair Value | 601,163 | 796,753
Securities Held to Maturity: |  |
Amortized Cost | 106,816 | 108,680
Gross Unrealized Gains |  | 74
Gross Unrealized Losses | (6,502) | (294)
Fair Value | 100,314 | 108,460
U.S. Government-Sponsored Agencies [Member] |  |
Securities Available for Sale: |  |
Amortized Cost | 244,761 | 280,045
Gross Unrealized Losses | (26,498) | (7,824)
Fair Value | 218,263 | 272,221
Securities Held to Maturity: |  |
Amortized Cost | 40,000 | 40,000
Gross Unrealized Gains |  | 7
Gross Unrealized Losses | (1,982) | (25)
Fair Value | 38,018 | 39,982
Mortgage-Backed Securities-Residential [Member] |  |
Securities Available for Sale: |  |
Amortized Cost | 364,177 | 481,062
Gross Unrealized Gains | 378 | 3,849
Gross Unrealized Losses | (24,042) | (7,937)
Fair Value | 340,513 | 476,974
Securities Held to Maturity: |  |
Amortized Cost | 66,816 | 68,680
Gross Unrealized Gains |  | 67
Gross Unrealized Losses | (4,520) | (269)
Fair Value | 62,296 | 68,478
SBA Pool Securities [Member] |  |
Securities Available for Sale: |  |
Amortized Cost | 38,326 | 40,649
Gross Unrealized Gains | 2 | 12
Gross Unrealized Losses | (2,853) | (1,100)
Fair Value | 35,475 | 39,561
State and Political Subdivisions [Member] |  |
Securities Available for Sale: |  |
Amortized Cost | 4,523 | 5,431
Gross Unrealized Gains | 3 | 45
Gross Unrealized Losses | (6) |
Fair Value | 4,520 | 5,476
Corporate Bond [Member] |  |
Securities Available for Sale: |  |
Amortized Cost | 2,500 | 2,500
Gross Unrealized Gains |  | 21
Gross Unrealized Losses | (108) |
Fair Value | $ 2,392 | $ 2,521

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