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INVESTMENTS (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	$ 664,768	$ 702,937
Available-for-sale securities, at fair value (amortized cost of $664,768 and $702,937, respectively)	603,211	625,808
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	5,424	6,429
Unrealized Gains	1	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	50	44
Available-for-sale securities, at fair value (amortized cost of $664,768 and $702,937, respectively)	5,375	6,386
MBS issued or guaranteed by U.S. government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	497,174	525,439
Unrealized Gains	1,011	630
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	54,476	65,978
Available-for-sale securities, at fair value (amortized cost of $664,768 and $702,937, respectively)	443,709	460,091
CMO issued or guaranteed by U.S. government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	140,490	149,387
Unrealized Gains	917	1,161
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	7,523	9,537
Available-for-sale securities, at fair value (amortized cost of $664,768 and $702,937, respectively)	133,884	141,011
Corporate bonds
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	21,680	21,682
Unrealized Gains	8	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,445	3,363
Available-for-sale securities, at fair value (amortized cost of $664,768 and $702,937, respectively)	20,243	18,320
Total AFS debt securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	664,768	702,937
Unrealized Gains	1,937	1,793
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	63,494	78,922
Available-for-sale securities, at fair value (amortized cost of $664,768 and $702,937, respectively)	$ 603,211	$ 625,808

X

- 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

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
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Amortized cost of 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 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Topic 942
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-Name Accounting Standards Codification
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