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Investments (Narrative) (Details) - USD ($)
Feb. 01, 2022
Mar. 31, 2023
Investments [Abstract]    
Transfer to Held-to-maturity $ 139,000,000.0  
Net unrealized (losses)/gains on all other AFS securities (8,400,000)  
Gain (loss) on transfer to Held-to-maturity $ 0  
Available-for-sale securities pledged as collateral   $ 67,300,000