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SECURITIES (Securities with Continuous Loss Position) (Details)
$ in Thousands
Mar. 31, 2023
USD ($)
numberOfSecurities
Dec. 31, 2022
USD ($)
numberOfSecurities
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 643,639 $ 1,462,517
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,846,823 1,222,815
Debt Securities, Available-for-sale, Unrealized Loss Position 2,490,462 2,685,332
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 27,558 137,551
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 361,201 293,658
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 388,759 $ 431,209
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | numberOfSecurities 259 298
U.S. Government and agency obligations    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 24,785 $ 33,407
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 23,739 16,732
Debt Securities, Available-for-sale, Unrealized Loss Position 48,524 50,139
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 216 882
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 895 362
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 1,111 1,244
Municipal bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 49,555 188,920
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 106,391 33,907
Debt Securities, Available-for-sale, Unrealized Loss Position 155,946 222,827
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,218 25,592
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 30,695 15,178
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 31,913 40,770
Corporate bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 42,252 108,187
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 74,552 13,066
Debt Securities, Available-for-sale, Unrealized Loss Position 116,804 121,253
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 4,953 9,547
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 10,912 1,934
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 15,865 11,481
Mortgage-backed or related securities    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 403,356 930,566
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,558,227 1,159,110
Debt Securities, Available-for-sale, Unrealized Loss Position 1,961,583 2,089,676
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 19,053 90,537
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 315,987 276,184
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 335,040 366,721
Asset-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 123,691 201,437
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 83,914 0
Debt Securities, Available-for-sale, Unrealized Loss Position 207,605 201,437
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2,118 10,993
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2,712 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 4,830 $ 10,993