SECURITIES (Securities with Continuous Loss Position) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	$ 1,359,199	$ 189,078
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(38,379)	(1,135)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	811,239	58,616
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(12,715)	(1,004)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	2,170,438	247,694
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	51,094	2,139
U.S. Government and agency obligations
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	0	3,126
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	(8)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	71,306	50,603
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(621)	(927)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	71,306	53,729
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	621	935
Municipal bonds
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	40,397	495
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(221)	(2)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	8,541	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(99)	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	48,938	495
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	320	2
Corporate bonds
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	8,009	3,586
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(121)	(79)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	9,938	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(62)	0
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	17,947	3,586
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	183	79
Mortgage-backed or related securities
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	1,307,411	181,871
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(38,028)	(1,046)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	721,454	2,337
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(11,933)	(14)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	2,028,865	184,208
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	49,961	1,060
Asset-backed securities
Debt Securities, Available-for-sale [Abstract]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months	3,382	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(9)	0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer	0	5,676
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	(63)
Debt Securities, Available-for-sale, Unrealized Loss Position, Total	3,382	5,676
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss, Total	$ 9	$ 63

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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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Amount of accumulated unrealized loss on 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 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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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 less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on 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 less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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