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Securities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2021
Dec. 31, 2013
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]              
Available-for-sale securities transferred to held-to-maturity securities         $ 12,700 $ 536,000  
Unrealized net loss         $ 209 $ 13,300  
Realized gains (losses) $ 0 $ 131 $ (697) $ 23      
Equity investments 97,908   97,908       $ 102,037
Corporate debt securities              
Debt Securities, Available-for-sale [Line Items]              
Amortized cost 80,400   80,400        
Fair value 73,600   73,600        
State, municipal, and sovereign debt obligations              
Debt Securities, Available-for-sale [Line Items]              
Amortized cost 63,900   63,900        
Fair value 59,600   59,600        
Asset-backed securities              
Debt Securities, Available-for-sale [Line Items]              
Amortized cost 296,200   296,200        
Fair value $ 290,400   $ 290,400