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INVESTMENTS (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
AFS Investments (carried at fair value): |  |
Available-for-sale securities, at fair value | $ 780,343 | $ 789,899
HTM Investments (carried at amortized cost): |  |
Amortized Cost | 92,933 | 94,073
Unrealized Gains | 58 | 1,077
Unrealized Losses | (2,441) | (237)
Fair Value | 90,550 | 94,913
Obligations of states and political subdivisions |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 4,778 | 7,232
Unrealized Gains | 44 | 103
Unrealized Losses | (4) | 0
Available-for-sale securities, at fair value | 4,818 | 7,335
HTM Investments (carried at amortized cost): |  |
Amortized Cost | 92,933 | 94,073
Unrealized Gains | 58 | 1,077
Unrealized Losses | (2,441) | (237)
Fair Value | 90,550 | 94,913
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 479,836 | 510,176
Unrealized Gains | 350 | 597
Unrealized Losses | (19,888) | (7,471)
Available-for-sale securities, at fair value | 460,298 | 503,302
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 320,543 | 279,575
Unrealized Gains | 0 | 14
Unrealized Losses | (13,932) | (6,790)
Available-for-sale securities, at fair value | 306,611 | 272,799
Subordinated corporate bonds |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 8,589 | 5,484
Unrealized Gains | 65 | 173
Unrealized Losses | (38) | 0
Available-for-sale securities, at fair value | 8,616 | 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 | 813,746 | 803,021
Unrealized Gains | 459 | 1,139
Unrealized Losses | (33,862) | (14,261)
Available-for-sale securities, at fair value | $ 780,343 | $ 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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