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Securities Securities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Mar. 31, 2022
Mar. 31, 2020
Sep. 30, 2018
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]                
Available-for-sale securities transferred to Held-to-Maturity     $ 1,100,000 $ 873,600 $ 179,800      
Unrealized after tax gain (loss) on available for sale securities transferred to the held to maturity portfolio     $ 1,500 $ 69,000 $ (2,200)      
Secured borrowing under agreement to repurchase $ 220,900         $ 220,900    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 213,796         213,796   $ 258,224
Debt Securities, Available-for-sale, Unrealized Loss Position 3,851,579         3,851,579   $ 3,265,473
Sales           822,741 $ 173,477  
Debt Securities, Available-for-Sale, Realized Gain 86 $ 13            
Debt Securities, Available-for-sale, Realized Loss           72,200 $ 10,000  
Securities pledged as collateral                
Debt Securities, Available-for-sale [Line Items]                
Financial Instruments, Owned, at Fair Value 2,500,000         2,500,000    
Securities pledged as collateral                
Debt Securities, Available-for-sale [Line Items]                
Secured borrowing under agreement to repurchase $ 220,900         $ 220,900