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INVESTMENTS (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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AFS Investments (carried at fair value): |  |
Available-for-sale securities, at fair value (book value of $915,099 and $933,399, respectively) | $ 920,083 | $ 910,692
HTM Investments (carried at amortized cost): |  |
Amortized Cost | 1,304 | 1,307
Unrealized Gains | 31 | 8
Unrealized Losses | 0 | (24)
Fair Value | 1,335 | 1,291
Obligations of states and political subdivisions |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 87,223 | 94,430
Unrealized Gains | 1,932 | 216
Unrealized Losses | (26) | (894)
Available-for-sale securities, at fair value (book value of $915,099 and $933,399, respectively) | 89,129 | 93,752
HTM Investments (carried at amortized cost): |  |
Amortized Cost | 1,304 | 1,307
Unrealized Gains | 31 | 8
Unrealized Losses | 0 | (24)
Fair Value | 1,335 | 1,291
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 455,330 | 466,613
Unrealized Gains | 3,250 | 583
Unrealized Losses | (2,203) | (13,524)
Available-for-sale securities, at fair value (book value of $915,099 and $933,399, respectively) | 456,377 | 453,672
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 351,149 | 351,958
Unrealized Gains | 3,940 | 1,007
Unrealized Losses | (3,018) | (10,071)
Available-for-sale securities, at fair value (book value of $915,099 and $933,399, respectively) | 352,071 | 342,894
Subordinated corporate bonds |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 21,397 | 20,398
Unrealized Gains | 1,109 | 23
Unrealized Losses | 0 | (47)
Available-for-sale securities, at fair value (book value of $915,099 and $933,399, respectively) | 22,506 | 20,374
Total AFS investments |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 915,099 | 933,399
Unrealized Gains | 10,231 | 1,829
Unrealized Losses | (5,247) | (24,536)
Available-for-sale securities, at fair value (book value of $915,099 and $933,399, respectively) | $ 920,083 | $ 910,692

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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