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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
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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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