INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) $ in Thousands	Mar. 31, 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	302	335
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 31,146	$ 215,593
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	596	16,957
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	620,101	457,955
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(90,857)	(84,273)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	651,247	673,548
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 91,453	$ 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	54	83
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 19,151	$ 42,276
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	48	463
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	10,384	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(84)	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	29,535	42,276
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 132	$ 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	172	175
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 3,310	$ 118,290
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	80	11,521
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	488,861	381,355
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(77,552)	(73,436)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	492,171	499,645
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 77,632	$ 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	62	64
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 2,506	$ 47,340
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	56	4,589
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	103,727	62,007
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(11,263)	(8,824)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	106,233	109,347
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 11,319	$ 13,413
Subordinated 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	$ 6,179	$ 7,687
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	412	384
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	17,129	14,593
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1,958)	(2,013)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	23,308	22,280
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 2,370	$ 2,397