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DEBT SECURITIES - Additional Information on Debt Securities In Unrealized or Unrecognized Loss Position (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
security
Available for Sale    
Debt securities with gross unrealized or unrecognized losses, fair value | $ $ 1,674,234 $ 2,062,817
Gross unrealized or unrecognized losses on debt securities | $ $ 248,312 $ 247,245
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses 14.80% 12.00%
Count of debt securities | security 708 835
Count of debt securities in an unrealized or unrecognized loss position | security 654 779
Held to Maturity    
Debt securities with gross unrealized or unrecognized losses, fair value | $ $ 713,031 $ 730,397
Gross unrealized or unrecognized losses on debt securities | $ $ 149,187 $ 142,231
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses 20.90% 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 | $ $ 2,387,265 $ 2,793,214
Gross unrealized or unrecognized losses on debt securities | $ $ 397,499 $ 389,476
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses 16.70% 13.90%
Count of debt securities | security 763 890
Count of debt securities in an unrealized or unrecognized loss position | security 709 834