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SECURITIES (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) $ in Thousands | Mar. 31, 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 | 232 | 209
Fair Value - Less Than 12 Months | $ 586,429 | $ 511,991
Unrealized Losses - Less Than 12 Months | (8,859) | (8,686)
Fair Value - 12 Months of More | 98,729 | 103,708
Unrealized Losses - 12 Months or More | (4,235) | (3,850)
Fair Value | 685,158 | 615,699
Unrealized losses | (13,094) | (12,536)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 45,174 | 42,805
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (713) | (631)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 45,174 | 42,805
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss | (713) | (631)
AFS and HTM securities in Continues Unrealized Loss Position | 730,300 | $ 658,500
Unrealized Loss as a Percent of Fair Value |  | 2.00%
AFS and HTM Securities Unrealized Loss Accumulated in Investments | 13,800 | $ 13,200
Mortgage Backed Securities and Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value - 12 Months of More | 98,700 | 103,700
AFS and HTM Securities Unrealized Loss Accumulated in Investments | 4,200 | 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 | 393,109 | 348,579
Unrealized Losses - Less Than 12 Months | (5,745) | (5,780)
Fair Value - 12 Months of More | 28,177 | 29,496
Unrealized Losses - 12 Months or More | (1,285) | (1,335)
Fair Value | 421,286 | 378,075
Unrealized losses | (7,030) | (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 | 193,320 | 163,412
Unrealized Losses - Less Than 12 Months | (3,114) | (2,906)
Fair Value - 12 Months of More | 70,552 | 74,212
Unrealized Losses - 12 Months or More | (2,950) | (2,515)
Fair Value | 263,872 | 237,624
Unrealized losses | (6,064) | (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 | 45,174 | 42,805
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (713) | (631)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value | 45,174 | 42,805
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (713) | $ (631)

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