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Securities - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2013
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]            
Available-for-sale securities transferred to held-to-maturity securities         $ 536,000,000.0  
Unrealized net loss on securities transferred from available-for-sale to held-to-maturity, gross         $ 13,300,000  
Realized gain or losses on the sale of available-for-sale securities $ 0 $ 0 $ 0 $ 0    
Corporate debt securities, callable, amortized cost 34,000,000.0   34,000,000.0      
Corporate debt securities, callable, estimated fair value 35,500,000   35,500,000      
Securities pledged for other debt obligations, at fair value 991,300,000   991,300,000     $ 435,900,000
Equity investments, at estimated fair value 90,917,000   90,917,000     107,079,000
CLOs            
Debt Securities, Available-for-sale [Line Items]            
Corporate debt securities, callable, amortized cost 97,900,000   97,900,000      
Reverse Repurchase Agreement            
Debt Securities, Available-for-sale [Line Items]            
Securities pledged for repurchase agreements, at fair value $ 277,400,000   $ 277,400,000     $ 152,700,000