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INVESTMENTS (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	$ 833,888	$ 1,508,981
Available-for-sale securities, at fair value (amortized cost of $833,888 and $1,508,981, respectively)	723,618	1,507,486
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total		8,585
Unrealized Gains		0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		241
Available-for-sale securities, at fair value (amortized cost of $833,888 and $1,508,981, respectively)		8,344
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	53,247	112,086
Unrealized Gains	1	5,392
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,774	0
Available-for-sale securities, at fair value (amortized cost of $833,888 and $1,508,981, respectively)	51,474	117,478
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	622,660	1,003,869
Unrealized Gains	65	7,856
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	92,937	11,468
Available-for-sale securities, at fair value (amortized cost of $833,888 and $1,508,981, respectively)	529,788	1,000,257
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	134,872	361,781
Unrealized Gains	0	2,835
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	13,061	5,767
Available-for-sale securities, at fair value (amortized cost of $833,888 and $1,508,981, respectively)	121,811	358,849
Subordinated corporate bonds
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	23,109	22,660
Unrealized Gains	0	152
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2,564	254
Available-for-sale securities, at fair value (amortized cost of $833,888 and $1,508,981, respectively)	20,545	22,558
Total AFS debt securities
Debt Securities, Available-for-sale [Abstract]
Amortized Cost, Total	833,888	1,508,981
Unrealized Gains	66	16,235
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	110,336	17,730
Available-for-sale securities, at fair value (amortized cost of $833,888 and $1,508,981, respectively)	$ 723,618	$ 1,507,486

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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).

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