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INVESTMENTS (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost, Total | $ 685,263 | $ 702,937
Available-for-sale securities, at fair value (amortized cost of $685,263 and $702,937, respectively) | 601,576 | 625,808
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost, Total | 5,426 | 6,429
Unrealized Gains | 2 | 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 58 | 44
Available-for-sale securities, at fair value (amortized cost of $685,263 and $702,937, respectively) | 5,370 | 6,386
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost, Total | 514,054 | 525,439
Unrealized Gains | 333 | 630
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 72,381 | 65,978
Available-for-sale securities, at fair value (amortized cost of $685,263 and $702,937, respectively) | 442,006 | 460,091
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost, Total | 144,102 | 149,387
Unrealized Gains | 490 | 1,161
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 9,795 | 9,537
Available-for-sale securities, at fair value (amortized cost of $685,263 and $702,937, respectively) | 134,797 | 141,011
Corporate bonds |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost, Total | 21,681 | 21,682
Unrealized Gains | 0 | 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2,278 | 3,363
Available-for-sale securities, at fair value (amortized cost of $685,263 and $702,937, respectively) | 19,403 | 18,320
Total AFS debt securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost, Total | 685,263 | 702,937
Unrealized Gains | 825 | 1,793
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 84,512 | 78,922
Available-for-sale securities, at fair value (amortized cost of $685,263 and $702,937, respectively) | $ 601,576 | $ 625,808

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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