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SECURITIES (Schedule of Gross Unrealized Losses and Fair Value of Investments) (Details) - USD ($) $ in Thousands | Jun. 30, 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 | $ 38,119 | $ 475,029
Less than 12 months, Unrealized Losses | (201) | (5,361)
More than 12 Months, Fair Value | 183,952 | 385,433
More than 12 months, Unrealized Losses | (1,748) | (10,184)
Total, Fair Value | 222,071 | 860,462
Total, Unrealized Losses | (1,949) | (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 | 775 | 133,513
Less than 12 months, Unrealized Losses | 0 | (1,566)
More than 12 Months, Fair Value | 731 | 10,145
More than 12 months, Unrealized Losses | (11) | (375)
Total, Fair Value | 1,506 | 143,658
Total, Unrealized Losses | (11) | (1,941)
Corporate and other bonds |  |
Schedule of gross unrealized losses and fair value of investments [Line Items] |  |
Less than 12 months, Fair Value | 10,518 | 35,478
Less than 12 months, Unrealized Losses | (85) | (315)
More than 12 Months, Fair Value | 33,592 | 33,888
More than 12 months, Unrealized Losses | (424) | (668)
Total, Fair Value | 44,110 | 69,366
Total, Unrealized Losses | (509) | (983)
Mortgage-backed securities |  |
Schedule of gross unrealized losses and fair value of investments [Line Items] |  |
Less than 12 months, Fair Value | 26,826 | 306,038
Less than 12 months, Unrealized Losses | (116) | (3,480)
More than 12 Months, Fair Value | 149,629 | 341,400
More than 12 months, Unrealized Losses | (1,313) | (9,141)
Total, Fair Value | 176,455 | 647,438
Total, Unrealized Losses | $ (1,429) | $ (12,621)

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