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Borrowings - Schedules of Short-term Borrowings and Long-term Borrowings (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Long-Term Borrowings    
Available capacity $ 1,315,379 $ 752,509
Unamortized Deferred Issuance Costs (175) (206)
Long-term borrowings 69,825 69,794
Total borrowings, gross 2,221,655 1,080,101
Total borrowings 2,221,480 $ 1,079,895
Investment securities pledged with collateral par 1,100,000  
Asset Pledged as Collateral    
Long-Term Borrowings    
Available capacity $ 709,200  
Subordinated notes, 5.75%    
Long-Term Borrowings    
Interest rate (as a percent) 5.75% 5.75%
Long-term borrowings, gross $ 70,000 $ 70,000
Unamortized Deferred Issuance Costs (175) (206)
Long-term borrowings 69,825 69,794
Secured Debt    
Long-Term Borrowings    
Short-term borrowings 2,113,801 975,001
Available capacity 1,315,379 752,509
Customer repurchase agreements    
Long-Term Borrowings    
Short-term borrowings $ 37,854 $ 35,100
Interest rate (as a percent) 3.27% 2.94%
FHLB secured borrowings | Secured Debt    
Long-Term Borrowings    
Short-term borrowings $ 1,313,801 $ 975,001
Available capacity $ 653,946 $ 145,104
Interest rate (as a percent) 5.06% 4.57%
BTFP secured borrowings | Asset Pledged as Collateral    
Long-Term Borrowings    
Available capacity $ 37,200  
BTFP secured borrowings | Secured Debt    
Long-Term Borrowings    
Short-term borrowings 800,000  
Available capacity $ 37,182  
Interest rate (as a percent) 4.38%  
Discount window secured borrowings | Secured Debt    
Long-Term Borrowings    
Available capacity $ 606,201 $ 607,405
Raymond James repurchase agreement | Asset Pledged as Collateral    
Long-Term Borrowings    
Available capacity 18,100  
Raymond James repurchase agreement | Secured Debt    
Long-Term Borrowings    
Available capacity 18,050  
FHLB, BTFP and Raymond James Repurchase Line    
Long-Term Borrowings    
Available capacity $ 1,700,000