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SECURITIES (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) $ in Thousands | Sep. 30, 2017 USD ($) security | Dec. 31, 2016 USD ($) security
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Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 177 | 209
Fair Value - Less Than 12 Months | $ 480,390 | $ 511,991
Unrealized Losses - Less Than 12 Months | (4,706) | (8,686)
Fair Value - 12 Months of More | 135,730 | 103,708
Unrealized Losses - 12 Months or More | (4,751) | (3,850)
Fair Value | 616,120 | 615,699
Unrealized losses | (9,457) | (12,536)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 15,234 | 42,805
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (193) | (631)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 2,361 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (89) | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 17,595 | 42,805
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss | (282) | (631)
AFS and HTM securities in Continuous Unrealized Loss Position | $ 633,700 | $ 658,500
Unrealized Loss as a Percent of Fair Value | 1.50% | 2.00%
AFS and HTM Securities Unrealized Loss Accumulated in Investments | $ 9,700 | $ 13,200
Mortgage Backed Securities and Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
AFS and HTM Securities Unrealized Loss Accumulated in Investments | 4,800 | 3,900
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less Than 12 Months | 345,629 | 348,579
Unrealized Losses - Less Than 12 Months | (3,127) | (5,780)
Fair Value - 12 Months of More | 47,553 | 29,496
Unrealized Losses - 12 Months or More | (1,493) | (1,335)
Fair Value | 393,182 | 378,075
Unrealized losses | (4,620) | (7,115)
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - Less Than 12 Months | 134,761 | 163,412
Unrealized Losses - Less Than 12 Months | (1,579) | (2,906)
Fair Value - 12 Months of More | 88,177 | 74,212
Unrealized Losses - 12 Months or More | (3,258) | (2,515)
Fair Value | 222,938 | 237,624
Unrealized losses | (4,837) | (5,421)
Obligations of states and political subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 15,234 | 42,805
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (193) | (631)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 2,361 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (89) | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 17,595 | 42,805
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (282) | $ (631)

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