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DEBT SECURITIES - Schedule of Additional Information on Debt Securities In Unrealized or Unrecognized Loss Position (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Available for Sale    
Debt securities with gross unrealized or unrecognized losses, fair value | $ $ 1,373,425 $ 2,062,817
Gross unrealized or unrecognized losses on debt securities | $ $ 192,315 $ 247,245
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses 14.00% 12.00%
Count of debt securities | security 704 835
Count of debt securities in an unrealized or unrecognized loss position | security 572 779
Held to Maturity    
Debt securities with gross unrealized or unrecognized losses, fair value | $ $ 712,369 $ 730,397
Gross unrealized or unrecognized losses on debt securities | $ $ 126,514 $ 142,231
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses 17.80% 19.50%
Count of debt securities | security 55 55
Count of debt securities in an unrealized or unrecognized loss position | security 55 55
Total    
Debt securities with gross unrealized or unrecognized losses, fair value | $ $ 2,085,794 $ 2,793,214
Gross unrealized or unrecognized losses on debt securities | $ $ 318,829 $ 389,476
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses 15.30% 13.90%
Count of debt securities | security 759 890
Count of debt securities in an unrealized or unrecognized loss position | security 627 834