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Securities - Narrative (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
security
Mar. 31, 2023
USD ($)
security
Mar. 31, 2022
USD ($)
security
Dec. 31, 2022
USD ($)
security
Investments, Debt and Equity Securities [Abstract]        
Number of securities | security 793   793  
Aggregate fair value of securities $ 120,900,000   $ 120,900,000  
Loss from net unrealized holdings, net of tax $ 814,000 $ (14,608,000) $ 64,286,000  
Number of securities in unrealized loss positions | security   2,647   2,828
Unrealized loss positions   $ 2,537,466,000   $ 2,599,464,000
Percentage of portfolio   95.70%   97.00%
Allowance for credit losses for available for sale debt securities   $ 0   $ 0
Accrued interest receivable on available for sale debt securities   $ 17,000,000   $ 17,800,000