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SECURITIES (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Investments [Line Items] |  |
Available-for-sale, Amortized Cost | $ 805,198 | $ 789,229
Available-for-sale, Unrealized Gains | 1,510 | 3,174
Available-for-sale, Unrealized Losses | (9,457) | (12,536)
Available-for-sale securities, at fair value | 797,251 | 779,867
Held-to-maturity securities, at amortized cost | 94,207 | 94,609
Held-to-maturity securities, Unrealized Gains | 1,169 | 618
Held-to-maturity securities, Unrealized Losses | (282) | (631)
Held-to-maturity Securities, Fair Value | 95,094 | 94,596
Obligations of states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Available-for-sale, Amortized Cost | 7,233 | 8,848
Available-for-sale, Unrealized Gains | 132 | 153
Available-for-sale, Unrealized Losses | 0 | 0
Available-for-sale securities, at fair value | 7,365 | 9,001
Held-to-maturity securities, at amortized cost | 94,207 | 94,609
Held-to-maturity securities, Unrealized Gains | 1,169 | 618
Held-to-maturity securities, Unrealized Losses | (282) | (631)
Held-to-maturity Securities, Fair Value | 95,094 | 94,596
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
Schedule of Investments [Line Items] |  |
Available-for-sale, Amortized Cost | 524,763 | 485,222
Available-for-sale, Unrealized Gains | 961 | 2,515
Available-for-sale, Unrealized Losses | (4,620) | (7,115)
Available-for-sale securities, at fair value | 521,104 | 480,622
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
Schedule of Investments [Line Items] |  |
Available-for-sale, Amortized Cost | 267,096 | 289,046
Available-for-sale, Unrealized Gains | 131 | 265
Available-for-sale, Unrealized Losses | (4,837) | (5,421)
Available-for-sale securities, at fair value | 262,390 | 283,890
Corporate Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale, Amortized Cost | 5,483 | 5,481
Available-for-sale, Unrealized Gains | 168 | 132
Available-for-sale, Unrealized Losses | 0 | 0
Available-for-sale securities, at fair value | 5,651 | 5,613
Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale, Amortized Cost | 804,575 | 788,597
Available-for-sale, Unrealized Gains | 1,392 | 3,065
Available-for-sale, Unrealized Losses | (9,457) | (12,536)
Available-for-sale securities, at fair value | 796,510 | 779,126
Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale, Amortized Cost | 623 | 632
Available-for-sale, Unrealized Gains | 118 | 109
Available-for-sale, Unrealized Losses | 0 | 0
Available-for-sale securities, at fair value | $ 741 | $ 741

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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