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SECURITIES (Gross Realized Gains and Losses on the Sale of Securities) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Securities [Abstract] |  |  |  |
Gross realized gains | $ 18 | $ 7,104 | $ 12,522 | $ 9,161
Gross realized losses | 0 | 0 | (229) | (1,855)
Gains on securities transactions, net | 18 | 7,104 | 12,293 | 7,306
Proceeds from sales of securities | $ 4,675 | $ 98,975 | $ 232,946 | $ 486,925

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