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Borrowings - Other (Details)
$ in Thousands
 12 Months Ended
Mar. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
period
D
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jul. 20, 2023
USD ($)
Borrowings          
Amount outstanding   $ 964,127 $ 930,392    
Proceeds from borrowings   $ 95,570,319 65,777,538 $ 31,471,236  
Federal Reserve discount window borrowings          
Borrowings          
Maturity period, minimum (in hours) | period   24      
Maturity period, maximum (in days) | D   90      
Outstanding balance   $ 0 20,000    
Amount outstanding     20,000    
Short-Term Subordinated Debt          
Borrowings          
Amount outstanding   64,922 21,000    
Short-Term Subordinated Debt | Customer          
Borrowings          
Maximum investment by counterparty in Company's subordinated debt   60,000      
Amount outstanding   $ 39,000 21,000    
Additional interest as a percentage of earnings   50.00%      
Agreement renewal term   2 years      
Notice period of Non-renewal   180 days      
Short-Term Subordinated Debt | Customer | SOFR          
Borrowings          
Basis spread on variable rate (as a percent)   3.00%      
Additional Warehousing Financing Agreement, Subordinated Debt | Customer          
Borrowings          
Maximum investment by counterparty in Company's subordinated debt         $ 30,000
Amount outstanding   $ 25,900 0    
Additional interest as a percentage of earnings   50.00%      
Agreement renewal term   2 years      
Notice period of Non-renewal   180 days      
Additional Warehousing Financing Agreement, Subordinated Debt | Customer | SOFR          
Borrowings          
Basis spread on variable rate (as a percent)   3.00%      
FHLB Advances          
Borrowings          
Outstanding balance   $ 771,400 859,400    
Amount outstanding   771,392 859,392    
Mortgage loans pledged as collateral   3,400,000 2,800,000    
Available for sale securities and securities purchased under agreements to resell pledged as collateral   $ 971,300 $ 298,600    
FHLB Advances | Minimum          
Borrowings          
FHLB advances interest rate   2.18% 1.62%    
FHLB Advances | Maximum          
Borrowings          
FHLB advances interest rate   5.52% 4.90%    
Credit linked notes          
Borrowings          
Amount outstanding   $ 119,879      
Notes issued $ 158,100        
Proceeds from borrowings 153,500        
Repayment of principal $ 1,100,000        
Credit risk percentage 1.00%        
Effective interest rate (as a percent)   20.90%      
Credit linked notes | Restricted Cash          
Borrowings          
Debt instrument, collateral amount   $ 36,400      
Credit linked notes | Short term Treasury Securities          
Borrowings          
Debt instrument, collateral amount   $ 89,000      
Credit linked notes | SOFR          
Borrowings          
Basis spread on variable rate (as a percent)   15.50%      
Other Borrowings          
Borrowings          
Fixed rate (as a percent)   1.00%      
Amount outstanding   $ 7,934 $ 0    
Commercial, agricultural and construction loans | Federal Reserve discount window borrowings          
Borrowings          
Amount of borrowings secured   3,100,000 2,400,000    
American Financial Exchange, Extensions of Credit          
Borrowings          
Maximum borrowing capacity   390,000 500,000    
Outstanding balance   $ 0 $ 30,000    
Fixed rate (as a percent)     4.60%