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DEBT SECURITIES - Schedule of Additional Information on Debt Securities In Unrealized or Unrecognized Loss Position (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
security
Dec. 31, 2024
USD ($)
security
Available for Sale    
Debt securities with gross unrealized or unrecognized losses, fair value | $ $ 1,163,233 $ 1,466,743
Gross unrealized or unrecognized losses on debt securities | $ $ 162,225 $ 230,325
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses 13.90% 15.70%
Count of debt securities | security 632 677
Count of debt securities in an unrealized or unrecognized loss position | security 428 586
Held to Maturity    
Debt securities with gross unrealized or unrecognized losses, fair value | $ $ 659,471 $ 675,053
Gross unrealized or unrecognized losses on debt securities | $ $ 125,350 $ 151,577
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses 19.00% 22.50%
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 | $ $ 1,822,704 $ 2,141,796
Gross unrealized or unrecognized losses on debt securities | $ $ 287,575 $ 381,902
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses 15.80% 17.80%
Count of debt securities | security 687 732
Count of debt securities in an unrealized or unrecognized loss position | security 483 641