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Borrowings - Schedules of Short-term Borrowings and Long-term Borrowings (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Aug. 05, 2014
Long-Term Borrowings      
Available capacity $ 2,182,631 $ 752,509  
Unamortized Deferred Issuance Costs (144) (206)  
Long-term borrowings 69,856 69,794  
Total borrowings, gross 1,943,776 1,080,101  
Total borrowings 1,943,632 $ 1,079,895  
Investment securities pledged with collateral par 428,200    
Asset Pledged as Collateral      
Long-Term Borrowings      
Available capacity $ 1,600,000    
Subordinated notes, 5.75%      
Long-Term Borrowings      
Interest rate (as a percent) 5.75% 5.75% 5.75%
Long-term borrowings, gross $ 70,000 $ 70,000  
Unamortized Deferred Issuance Costs (144) (206)  
Long-term borrowings 69,856 69,794  
Secured Debt      
Long-Term Borrowings      
Short-term borrowings 1,836,759 975,001  
Available capacity 2,182,631 752,509  
Customer repurchase agreements      
Long-Term Borrowings      
Short-term borrowings $ 37,017 $ 35,100  
Interest rate (as a percent) 3.27% 2.94%  
FHLB secured borrowings | Secured Debt      
Long-Term Borrowings      
Short-term borrowings $ 536,759 $ 975,001  
Available capacity $ 1,287,028 $ 145,104  
Interest rate (as a percent) 5.34% 4.57%  
BTFP secured borrowings | Asset Pledged as Collateral      
Long-Term Borrowings      
Available capacity $ 286,500    
BTFP secured borrowings | Secured Debt      
Long-Term Borrowings      
Short-term borrowings 1,300,000    
Available capacity $ 286,464    
Interest rate (as a percent) 4.53%    
Discount window secured borrowings | Secured Debt      
Long-Term Borrowings      
Available capacity $ 591,548 $ 607,405  
Raymond James repurchase agreement | Asset Pledged as Collateral      
Long-Term Borrowings      
Available capacity 17,600    
Raymond James repurchase agreement | Secured Debt      
Long-Term Borrowings      
Available capacity 17,591    
FHLB, BTFP and Raymond James Repurchase Line      
Long-Term Borrowings      
Available capacity $ 2,000,000