INVESTMENTS (Schedule of Unrealized Gross Losses and Estimated Fair values of Investment Securities) (Details) $ in Thousands	Jun. 30, 2022 USD ($) security	Dec. 31, 2021 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| security	335	180
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 654,758	$ 871,583
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	61,494	14,074
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	106,551	101,074
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(15,174)	(3,656)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	761,309	972,657
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 76,668	$ 17,730
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	78
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 39,703
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	320
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	39,703
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 320
Mortgage-backed securities 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	170	113
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 500,257	$ 659,851
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	53,944	8,999
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	70,192	61,978
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(11,700)	(2,469)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	570,449	721,829
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 65,644	$ 11,468
Collateralized mortgage obligations 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	76	56
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 99,345	$ 191,456
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	5,562	4,602
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	34,506	38,117
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(3,328)	(1,165)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	133,851	229,573
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 8,890	$ 5,767
Subordinated corporate bonds
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| security	11	7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 15,453	$ 11,932
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,668	232
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	1,853	979
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(146)	(22)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	17,306	12,911
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss	$ 1,814	$ 254
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions \| security		4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months		$ 8,344
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss		241
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer		0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss		0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total		8,344
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss		$ 241

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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