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SECURITIES (Securities with Continuous Loss Position) (Details)
$ in Thousands
Sep. 30, 2022
USD ($)
numberOfSecurities
Dec. 31, 2021
USD ($)
numberOfSecurities
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 1,888,139 $ 1,359,199
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 875,770 811,239
Debt Securities, Available-for-sale, Unrealized Loss Position 2,763,909 2,170,438
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 238,371 38,379
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 199,582 12,715
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 437,953 $ 51,094
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | numberOfSecurities 313 97
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 $ 83,887 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 58,248 71,306
Debt Securities, Available-for-sale, Unrealized Loss Position 142,135 71,306
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,239 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 404 621
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 1,643 621
Municipal bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 229,339 40,397
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 15,853 8,541
Debt Securities, Available-for-sale, Unrealized Loss Position 245,192 48,938
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 42,086 221
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 8,601 99
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 50,687 320
Corporate bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 115,044 8,009
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 7,006 9,938
Debt Securities, Available-for-sale, Unrealized Loss Position 122,050 17,947
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 9,754 121
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 995 62
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 10,749 183
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 1,356,167 1,307,411
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 794,663 721,454
Debt Securities, Available-for-sale, Unrealized Loss Position 2,150,830 2,028,865
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 182,947 38,028
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 189,582 11,933
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 372,529 49,961
Asset-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 103,702 3,382
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0 0
Debt Securities, Available-for-sale, Unrealized Loss Position 103,702 3,382
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2,345 9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 2,345 $ 9