Debt Securities Held-to-maturity - Credit quality indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt securities held to maturity credit quality indicator [Line Items]
Held to maturity securities	$ 9,356,739	$ 79,461
Obligations of Puerto Rico, States and political subdivisions
Debt securities held to maturity credit quality indicator [Line Items]
Held to maturity securities	65,921	73,476
Obligations of Puerto Rico, States and political subdivisions | Munis Payable From Real and Personal Property Taxes
Debt securities held to maturity credit quality indicator [Line Items]
Held to maturity securities	24,660	30,145
Watch | Obligations of Puerto Rico, States and political subdivisions | Munis Payable From Real and Personal Property Taxes
Debt securities held to maturity credit quality indicator [Line Items]
Held to maturity securities	13,735	16,345
Pass | Obligations of Puerto Rico, States and political subdivisions | Munis Payable From Real and Personal Property Taxes
Debt securities held to maturity credit quality indicator [Line Items]
Held to maturity securities	$ 10,925	$ 13,800