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INVESTMENTS (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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AFS Investments (carried at fair value): |  |
Available-for-sale securities, at fair value (book value of $931,876 and $913,978, respectively) | $ 960,131 | $ 918,118
HTM Investments (carried at amortized cost): |  |
Amortized Cost | 1,300 | 1,302
Unrealized Gains | 58 | 57
Unrealized Losses | 0 | 0
Fair Value | 1,358 | 1,359
Obligations of states and political subdivisions |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 123,893 | 115,632
Unrealized Gains | 3,324 | 2,779
Unrealized Losses | (337) | (328)
Available-for-sale securities, at fair value (book value of $931,876 and $913,978, respectively) | 126,880 | 118,083
HTM Investments (carried at amortized cost): |  |
Amortized Cost | 1,300 | 1,302
Unrealized Gains | 58 | 57
Unrealized Losses | 0 | 0
Fair Value | 1,358 | 1,359
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 472,508 | 462,593
Unrealized Gains | 15,618 | 3,398
Unrealized Losses | (77) | (2,605)
Available-for-sale securities, at fair value (book value of $931,876 and $913,978, respectively) | 488,049 | 463,386
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 324,929 | 325,200
Unrealized Gains | 9,698 | 3,183
Unrealized Losses | (12) | (2,478)
Available-for-sale securities, at fair value (book value of $931,876 and $913,978, respectively) | 334,615 | 325,905
Subordinated corporate bonds |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 10,546 | 10,553
Unrealized Gains | 116 | 191
Unrealized Losses | (75) | 0
Available-for-sale securities, at fair value (book value of $931,876 and $913,978, respectively) | 10,587 | 10,744
Total AFS investments |  |
AFS Investments (carried at fair value): |  |
Amortized Cost | 931,876 | 913,978
Unrealized Gains | 28,756 | 9,551
Unrealized Losses | (501) | (5,411)
Available-for-sale securities, at fair value (book value of $931,876 and $913,978, respectively) | $ 960,131 | $ 918,118

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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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