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SECURITIES (Schedule of Gross Unrealized Losses and Fair Value of Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Schedule of gross unrealized losses and fair value of investments [Line Items] |  |
Less than 12 months, Fair Value | $ 105,040 | $ 475,029
Less than 12 months, Unrealized Losses | (417) | (5,361)
More than 12 Months, Fair Value | 503,030 | 385,433
More than 12 months, Unrealized Losses | (6,599) | (10,184)
Total, Fair Value | 608,070 | 860,462
Total, Unrealized Losses | (7,016) | (15,545)
Obligations of states and political subdivisions |  |
Schedule of gross unrealized losses and fair value of investments [Line Items] |  |
Less than 12 months, Fair Value | 777 | 133,513
Less than 12 months, Unrealized Losses | (4) | (1,566)
More than 12 Months, Fair Value | 4,823 | 10,145
More than 12 months, Unrealized Losses | (77) | (375)
Total, Fair Value | 5,600 | 143,658
Total, Unrealized Losses | (81) | (1,941)
Corporate and other bonds |  |
Schedule of gross unrealized losses and fair value of investments [Line Items] |  |
Less than 12 months, Fair Value | 34,413 | 35,478
Less than 12 months, Unrealized Losses | (206) | (315)
More than 12 Months, Fair Value | 39,561 | 33,888
More than 12 months, Unrealized Losses | (601) | (668)
Total, Fair Value | 73,974 | 69,366
Total, Unrealized Losses | (807) | (983)
Mortgage-backed securities |  |
Schedule of gross unrealized losses and fair value of investments [Line Items] |  |
Less than 12 months, Fair Value | 69,850 | 306,038
Less than 12 months, Unrealized Losses | (207) | (3,480)
More than 12 Months, Fair Value | 458,646 | 341,400
More than 12 months, Unrealized Losses | (5,921) | (9,141)
Total, Fair Value | 528,496 | 647,438
Total, Unrealized Losses | $ (6,128) | $ (12,621)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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