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Debt Securities - Additional Information (Details)
$ in Thousands
Sep. 30, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Available for Sale    
Debt securities with gross unrealized losses, fair value | $ $ 2,532,546 $ 2,783,177
Gross unrealized losses on debt securities | $ $ 328,867 $ 54,654
Ratio of gross unrealized losses to debt securities with gross unrealized losses 13.00% 2.00%
Count of debt securities | security 1,145 1,252
Count of debt securities in an unrealized loss position | security 1,109 373
Held to Maturity    
Debt securities with gross unrealized losses, fair value | $ $ 808,885 $ 0
Gross unrealized losses on debt securities | $ $ 127,443 $ 0
Ratio of gross unrealized losses to debt securities with gross unrealized losses 15.80% 0.00%
Count of debt securities | security 55 0
Count of debt securities in an unrealized loss position | security 55 0
Total    
Debt securities with gross unrealized losses, fair value | $ $ 3,341,431 $ 2,783,177
Gross unrealized losses on debt securities | $ $ 456,310 $ 54,654
Ratio of gross unrealized losses to debt securities with gross unrealized losses 13.70% 2.00%
Count of debt securities | security 1,200 1,252
Count of debt securities in an unrealized loss position | security 1,164 373