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DEBT SECURITIES - Schedule of Additional Information About Debt Securities Unrealized Loss Position (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Available for Sale    
Debt securities with gross unrealized or unrecognized losses, fair value | $ $ 2,062,817 $ 2,439,533
Gross unrealized or unrecognized losses on debt securities | $ $ 247,245 $ 311,204
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses 12.00% 12.80%
Count of debt securities | security 835 1,091
Count of debt securities in an unrealized or unrecognized loss position | security 779 1,032
Held to Maturity    
Debt securities with gross unrealized or unrecognized losses, fair value | $ $ 730,397 $ 785,295
Gross unrealized or unrecognized losses on debt securities | $ $ 142,231 $ 133,017
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses 19.50% 16.90%
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 | $ $ 2,793,214 $ 3,224,828
Gross unrealized or unrecognized losses on debt securities | $ $ 389,476 $ 444,221
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses 13.90% 13.80%
Count of debt securities | security 890 1,146
Count of debt securities in an unrealized or unrecognized loss position | security 834 1,087