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INVESTMENTS (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
AFS Investments (carried at fair value): |  |
Available-for-sale securities, at fair value | $ 799,000 | $ 789,899
HTM Investments (carried at amortized cost): |  |
Amortized Cost | 93,062 | 94,073
Unrealized Gains | 133 | 1,077
Unrealized Losses | (1,594) | (237)
Fair Value | 91,601 | 94,913
Obligations of states and political subdivisions |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 4,779 | 7,232
Unrealized Gains | 56 | 103
Unrealized Losses | (3) | 0
Available-for-sale securities, at fair value | 4,832 | 7,335
HTM Investments (carried at amortized cost): |  |
Amortized Cost | 93,062 | 94,073
Unrealized Gains | 133 | 1,077
Unrealized Losses | (1,594) | (237)
Fair Value | 91,601 | 94,913
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 512,595 | 510,176
Unrealized Gains | 386 | 597
Unrealized Losses | (17,713) | (7,471)
Available-for-sale securities, at fair value | 495,268 | 503,302
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 305,690 | 279,575
Unrealized Gains | 47 | 14
Unrealized Losses | (12,383) | (6,790)
Available-for-sale securities, at fair value | 293,354 | 272,799
Subordinated corporate bonds |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 5,485 | 5,484
Unrealized Gains | 82 | 173
Unrealized Losses | (21) | 0
Available-for-sale securities, at fair value | 5,546 | 5,657
Equity investments |  |
AFS Investments (carried at fair value): |  |
Amortized Cost |  | 554
Unrealized Gains |  | 252
Unrealized Losses |  | 0
Available-for-sale securities, at fair value |  | 806
Total AFS investments |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 828,549 | 803,021
Unrealized Gains | 571 | 1,139
Unrealized Losses | (30,120) | (14,261)
Available-for-sale securities, at fair value | $ 799,000 | $ 789,899

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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=82897076&loc=d3e27161-111563 + Details
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