INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) $ in Thousands	Jun. 30, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	327	335
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 40,019	$ 215,593
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,221	16,957
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	600,262	457,955
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(98,582)	(84,273)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	640,281	673,548
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 99,803	$ 101,230
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	75	83
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 30,020	$ 42,276
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	316	463
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	8,842	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(182)	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	38,862	42,276
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 498	$ 463
MBS issued or guaranteed by U.S. government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	178	175
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 7,275	$ 118,290
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	26	11,521
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	471,342	381,355
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(82,615)	(73,436)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	478,617	499,645
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 82,641	$ 84,957
CMO issued or guaranteed by U.S. government-sponsored enterprises
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	60	64
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 0	$ 47,340
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	4,589
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	100,701	62,007
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(13,088)	(8,824)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	100,701	109,347
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 13,088	$ 13,413
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	14	13
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 2,724	$ 7,687
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	879	384
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	19,377	14,593
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(2,697)	(2,013)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	22,101	22,280
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 3,576	$ 2,397