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SECURITIES (Securities with Continuous Loss Position) (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
numberOfSecurities
Dec. 31, 2023
USD ($)
numberOfSecurities
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 177,489 $ 208,081
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,467 1,477
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,920,713 2,042,517
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 372,653 356,794
Debt Securities, Available-for-sale, Unrealized Loss Position 2,098,202 2,250,598
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 374,120 $ 358,271
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | numberOfSecurities 221 224
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 $ 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 8,893 34,189
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 676 740
Debt Securities, Available-for-sale, Unrealized Loss Position 8,893 34,189
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 676 740
Municipal bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 2,913 6,049
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 62 7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 102,683 103,511
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 29,379 29,184
Debt Securities, Available-for-sale, Unrealized Loss Position 105,596 109,560
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 29,441 29,191
Corporate bonds    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 12,186 15,720
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 160 46
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 107,135 106,852
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 11,830 12,122
Debt Securities, Available-for-sale, Unrealized Loss Position 119,321 122,572
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 11,990 12,168
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 110,003 71,150
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,132 212
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,630,030 1,712,125
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 330,740 313,963
Debt Securities, Available-for-sale, Unrealized Loss Position 1,740,033 1,783,275
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 331,872 314,175
Asset-backed securities    
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 52,387 115,162
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 113 1,212
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 71,972 85,840
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 28 785
Debt Securities, Available-for-sale, Unrealized Loss Position 124,359 201,002
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 141 $ 1,997