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INVESTMENTS (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	$ 898,145	$ 673,003
Available-for-sale securities, at fair value (amortized cost of $898,145 and $673,003, respectively)	836,130	593,749
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	5,421	5,423
Unrealized Gains	1	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	108	134
Available-for-sale securities, at fair value (amortized cost of $898,145 and $673,003, respectively)	5,314	5,289
MBS issued or guaranteed by U.S. government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	686,698	493,766
Unrealized Gains	4,303	353
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	57,809	69,163
Available-for-sale securities, at fair value (amortized cost of $898,145 and $673,003, respectively)	633,192	424,956
CMO issued or guaranteed by U.S. government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	188,333	156,131
Unrealized Gains	1,026	502
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	7,976	9,154
Available-for-sale securities, at fair value (amortized cost of $898,145 and $673,003, respectively)	181,383	147,479
Subordinated corporate bonds
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	17,693	17,683
Unrealized Gains	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,452	1,658
Available-for-sale securities, at fair value (amortized cost of $898,145 and $673,003, respectively)	16,241	16,025
Total AFS debt securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	898,145	673,003
Unrealized Gains	5,330	855
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	67,345	80,109
Available-for-sale securities, at fair value (amortized cost of $898,145 and $673,003, respectively)	$ 836,130	$ 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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