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SECURITIES (Schedule of Carrying Value, Gross Unrealized Gains and Losses and Estimated Fair Value of Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Total HTM Securities | $ 552,176 | $ 555,144
Gross Unrealized Gains | 52,815 | 48,359
Gross Unrealized Losses | (211) | 0
Held-to-maturity Securities, Fair Value | 604,780 | 603,503
U.S. government and agency securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total HTM Securities | 2,797 | 2,813
Gross Unrealized Gains | 0 | 26
Gross Unrealized Losses | (69) | 0
Held-to-maturity Securities, Fair Value | 2,728 | 2,839
Obligations of states and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total HTM Securities | 543,517 | 545,148
Gross Unrealized Gains | 52,815 | 48,274
Gross Unrealized Losses | 0 | 0
Held-to-maturity Securities, Fair Value | 596,332 | 593,422
Total mortgage-back securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total HTM Securities | 5,862 | 7,183
Gross Unrealized Gains | 0 | 59
Gross Unrealized Losses | (142) | 0
Held-to-maturity Securities, Fair Value | 5,720 | 7,242
Commercial |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total HTM Securities | 5,862 | 7,183
Gross Unrealized Gains | 0 | 59
Gross Unrealized Losses | (142) | 0
Held-to-maturity Securities, Fair Value | 5,720 | 7,242
Residential |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Total HTM Securities | 0 | 0
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Held-to-maturity Securities, Fair Value | $ 0 | $ 0

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