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SECURITIES (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Investments [Line Items] |  |
Available-for-sale, Amortized Cost | $ 833,307 | $ 789,229
Available-for-sale, Unrealized Gains | 3,028 | 3,174
Available-for-sale, Unrealized Losses | (13,094) | (12,536)
Available-for-sale securities, at fair value | 823,241 | 779,867
Held-to-maturity securities, at amortized cost | 94,474 | 94,609
Held-to-maturity securities, Unrealized Gains | 583 | 618
Held-to-maturity securities, Unrealized Losses | (713) | (631)
Held-to-maturity Securities, Fair Value | 94,344 | 94,596
Obligations of states and political subdivisions |  |
Schedule of Investments [Line Items] |  |
Available-for-sale, Amortized Cost | 8,156 | 8,848
Available-for-sale, Unrealized Gains | 130 | 153
Available-for-sale, Unrealized Losses | 0 | 0
Available-for-sale securities, at fair value | 8,286 | 9,001
Held-to-maturity securities, at amortized cost | 94,474 | 94,609
Held-to-maturity securities, Unrealized Gains | 583 | 618
Held-to-maturity securities, Unrealized Losses | (713) | (631)
Held-to-maturity Securities, Fair Value | 94,344 | 94,596
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
Schedule of Investments [Line Items] |  |
Available-for-sale, Amortized Cost | 526,135 | 485,222
Available-for-sale, Unrealized Gains | 2,392 | 2,515
Available-for-sale, Unrealized Losses | (7,030) | (7,115)
Available-for-sale securities, at fair value | 521,497 | 480,622
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
Schedule of Investments [Line Items] |  |
Available-for-sale, Amortized Cost | 292,901 | 289,046
Available-for-sale, Unrealized Gains | 172 | 265
Available-for-sale, Unrealized Losses | (6,064) | (5,421)
Available-for-sale securities, at fair value | 287,009 | 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 | 190 | 132
Available-for-sale, Unrealized Losses | 0 | 0
Available-for-sale securities, at fair value | 5,673 | 5,613
Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale, Amortized Cost | 832,675 | 788,597
Available-for-sale, Unrealized Gains | 2,884 | 3,065
Available-for-sale, Unrealized Losses | (13,094) | (12,536)
Available-for-sale securities, at fair value | 822,465 | 779,126
Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available-for-sale, Amortized Cost | 632 | 632
Available-for-sale, Unrealized Gains | 144 | 109
Available-for-sale, Unrealized Losses | 0 | 0
Available-for-sale securities, at fair value | $ 776 | $ 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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