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SECURITIES (Schedule of Gross Unrealized Losses and Fair Value of Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Schedule of gross unrealized losses and fair value of investments |  |
Less than 12 months, Fair value | $ 475,029 | $ 335,205
Less than 12 Months, Unrealized Losses | (5,361) | (3,498)
More than 12 Months, Fair value | 385,433 | 197,640
More than 12 Months, Unrealized Losses | (10,184) | (4,188)
Fair value, Total | 860,462 | 532,845
Unrealized Losses, Total | (15,545) | (7,686)
Obligations of states and political subdivisions |  |
Schedule of gross unrealized losses and fair value of investments |  |
Less than 12 months, Fair value | 133,513 | 25,790
Less than 12 Months, Unrealized Losses | (1,566) | (132)
More than 12 Months, Fair value | 10,145 | 16,934
More than 12 Months, Unrealized Losses | (375) | (432)
Fair value, Total | 143,658 | 42,724
Unrealized Losses, Total | (1,941) | (564)
Mortgage-backed securities |  |
Schedule of gross unrealized losses and fair value of investments |  |
Less than 12 months, Fair value | 306,038 | 298,439
Less than 12 Months, Unrealized Losses | (3,480) | (3,267)
More than 12 Months, Fair value | 341,400 | 136,298
More than 12 Months, Unrealized Losses | (9,141) | (2,902)
Fair value, Total | 647,438 | 434,737
Unrealized Losses, Total | (12,621) | (6,169)
Corporate bonds and other securities |  |
Schedule of gross unrealized losses and fair value of investments |  |
Less than 12 months, Fair value | 35,478 | 10,976
Less than 12 Months, Unrealized Losses | (315) | (99)
More than 12 Months, Fair value | 33,888 | 44,408
More than 12 Months, Unrealized Losses | (668) | (854)
Fair value, Total | 69,366 | 55,384
Unrealized Losses, Total | $ (983) | $ (953)

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