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Borrowings - Narrative (Details) $ in Millions	12 Months Ended
Borrowings - Narrative (Details) $ in Millions	Dec. 31, 2021 USD ($) trustSubsidiary	Dec. 31, 2020	Oct. 28, 2020 USD ($)
Federal Home Loan Bank, Advances
Number of trust subsidiaries \| trustSubsidiary	9
Payment of interest on trust preferred securities	$ 0
Notes, matures 2030
Federal Home Loan Bank, Advances
Senior notes interest rate	4.125%	4.125%
Senior notes
Federal Home Loan Bank, Advances
Outstanding debt	$ 0
Subordinated notes \| Notes, matures 2030
Federal Home Loan Bank, Advances
Debt instrument face amount			$ 150
Senior notes interest rate			4.125%

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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