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INVESTMENTS (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
AFS Investments (carried at fair value): |  |
Available-for-sale securities, at fair value (book value of $933,135 and $933,399, respectively) | $ 924,311 | $ 910,692
HTM Investments (carried at amortized cost): |  |
Amortized Cost | 1,306 | 1,307
Unrealized Gains | 21 | 8
Unrealized Losses | (3) | (24)
Fair Value | 1,324 | 1,291
Obligations of states and political subdivisions |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 92,030 | 94,430
Unrealized Gains | 1,095 | 216
Unrealized Losses | (105) | (894)
Available-for-sale securities, at fair value (book value of $933,135 and $933,399, respectively) | 93,020 | 93,752
HTM Investments (carried at amortized cost): |  |
Amortized Cost | 1,306 | 1,307
Unrealized Gains | 21 | 8
Unrealized Losses | (3) | (24)
Fair Value | 1,324 | 1,291
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 453,980 | 466,613
Unrealized Gains | 1,290 | 583
Unrealized Losses | (6,449) | (13,524)
Available-for-sale securities, at fair value (book value of $933,135 and $933,399, respectively) | 448,821 | 453,672
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 366,727 | 351,958
Unrealized Gains | 1,888 | 1,007
Unrealized Losses | (7,215) | (10,071)
Available-for-sale securities, at fair value (book value of $933,135 and $933,399, respectively) | 361,400 | 342,894
Subordinated corporate bonds |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 20,398 | 20,398
Unrealized Gains | 672 | 23
Unrealized Losses | 0 | (47)
Available-for-sale securities, at fair value (book value of $933,135 and $933,399, respectively) | 21,070 | 20,374
Total AFS investments |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 933,135 | 933,399
Unrealized Gains | 4,945 | 1,829
Unrealized Losses | (13,769) | (24,536)
Available-for-sale securities, at fair value (book value of $933,135 and $933,399, respectively) | $ 924,311 | $ 910,692

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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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