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Debt Securities - Additional Information (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Available for Sale    
Debt securities with gross unrealized or unrecognized losses, fair value | $ $ 2,171,839 $ 2,439,533
Gross unrealized or unrecognized losses on debt securities | $ $ 334,552 $ 311,204
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses 15.40% 12.80%
Count of debt securities | security 1,001 1,091
Count of debt securities in an unrealized or unrecognized loss position | security 982 1,032
Held to Maturity    
Debt securities with gross unrealized or unrecognized losses, fair value | $ $ 701,676 $ 785,295
Gross unrealized or unrecognized losses on debt securities | $ $ 180,938 $ 133,017
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses 25.80% 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 | $ $ 2,873,515 $ 3,224,828
Gross unrealized or unrecognized losses on debt securities | $ $ 515,490 $ 444,221
Ratio of gross unrealized or unrecognized losses to debt securities with gross unrealized or unrecognized losses 17.90% 13.80%
Count of debt securities | security 1,056 1,146
Count of debt securities in an unrealized or unrecognized loss position | security 1,037 1,087