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INVESTMENTS (Summary of Amortized Costs and Estimated Fair Values of Available-For-Sale Securities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost, Total $ 705,019 $ 796,960
Available-for-sale securities, at fair value (amortized cost of $705,019 and $796,960, respectively) 589,003 695,875
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost, Total 42,652 49,678
Unrealized Gains 0 11
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1,983 463
Available-for-sale securities, at fair value (amortized cost of $705,019 and $796,960, respectively) 40,669 49,226
MBS issued or guaranteed by U.S. government-sponsored enterprises    
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost, Total 521,794 598,845
Unrealized Gains 19 131
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 96,837 84,957
Available-for-sale securities, at fair value (amortized cost of $705,019 and $796,960, respectively) 424,976 514,019
CMO issued or guaranteed by U.S. government-sponsored enterprises    
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost, Total 118,890 122,760
Unrealized Gains 25 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 14,099 13,413
Available-for-sale securities, at fair value (amortized cost of $705,019 and $796,960, respectively) 104,816 109,347
Corporate bonds    
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost, Total 21,683 25,677
Unrealized Gains 0 3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 3,141 2,397
Available-for-sale securities, at fair value (amortized cost of $705,019 and $796,960, respectively) 18,542 23,283
Total AFS debt securities    
Debt Securities, Available-for-sale [Abstract]    
Amortized Cost, Total 705,019 796,960
Unrealized Gains 44 145
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 116,060 101,230
Available-for-sale securities, at fair value (amortized cost of $705,019 and $796,960, respectively) $ 589,003 $ 695,875