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INVESTMENTS (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	$ 935,635	$ 673,003
Available-for-sale securities, at fair value (amortized cost of $935,635 and $673,003, respectively)	889,765	593,749
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	5,418	5,423
Unrealized Gains	1	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	22	134
Available-for-sale securities, at fair value (amortized cost of $935,635 and $673,003, respectively)	5,397	5,289
MBS issued or guaranteed by U.S. government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	688,685	493,766
Unrealized Gains	6,838	353
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	46,244	69,163
Available-for-sale securities, at fair value (amortized cost of $935,635 and $673,003, respectively)	649,279	424,956
CMO issued or guaranteed by U.S. government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	223,820	156,131
Unrealized Gains	1,076	502
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	6,892	9,154
Available-for-sale securities, at fair value (amortized cost of $935,635 and $673,003, respectively)	218,004	147,479
Subordinated corporate bonds
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	17,712	17,683
Unrealized Gains	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	627	1,658
Available-for-sale securities, at fair value (amortized cost of $935,635 and $673,003, respectively)	17,085	16,025
Total AFS debt securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	935,635	673,003
Unrealized Gains	7,915	855
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	53,785	80,109
Available-for-sale securities, at fair value (amortized cost of $935,635 and $673,003, respectively)	$ 889,765	$ 593,749

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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).

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