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SECURITIES (Schedule of Carrying Value, Gross Unrealized Gains and Losses and Estimated Fair Value of Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities, Total | $ 555,144 | $ 492,272
Gross Unrealized Gains | 48,359 |
Gross Unrealized Losses | 0 |
Held-to-maturity Securities, Fair Value | 603,503 | 499,501
Obligations of states and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities, Total | 545,148 | 492,272
Gross Unrealized Gains | 48,274 | 7,375
Gross Unrealized Losses | 0 | (146)
Held-to-maturity Securities, Fair Value | 593,422 | $ 499,501
Mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities, Total | 9,996 |
Gross Unrealized Gains | 85 |
Gross Unrealized Losses | 0 |
Held-to-maturity Securities, Fair Value | $ 10,081 |

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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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