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SECURITIES (Securities with Continuous Loss Position) (Details)
$ in Thousands
Jun. 30, 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 $ 425,318 $ 1,462,517
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,978,637 1,222,815
Debt Securities, Available-for-sale, Unrealized Loss Position 2,403,955 2,685,332
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 14,857 137,551
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 396,895 293,658
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 411,752 $ 431,209
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | numberOfSecurities 245 298
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 $ 0 $ 33,407
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 45,207 16,732
Debt Securities, Available-for-sale, Unrealized Loss Position 45,207 50,139
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 882
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,123 362
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 1,123 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 34,744 188,920
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 119,287 33,907
Debt Securities, Available-for-sale, Unrealized Loss Position 154,031 222,827
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 559 25,592
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 33,514 15,178
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 34,073 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 9,599 108,187
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 95,502 13,066
Debt Securities, Available-for-sale, Unrealized Loss Position 105,101 121,253
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 314 9,547
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 16,058 1,934
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 16,372 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 259,765 930,566
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,635,349 1,159,110
Debt Securities, Available-for-sale, Unrealized Loss Position 1,895,114 2,089,676
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 9,381 90,537
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 342,867 276,184
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 352,248 366,721
Asset-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 121,210 201,437
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 83,292 0
Debt Securities, Available-for-sale, Unrealized Loss Position 204,502 201,437
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 4,603 10,993
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 3,333 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 7,936 $ 10,993