Short-Term Borrowings - Components and Selected Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Short-term borrowings
Short-term borrowings	$ 250,000		$ 500,000
Federal Reserve Bank Advances
Short-term borrowings
Borrowing capacity	3,100,000		3,300,000
Federal funds purchased:
Short-term borrowings
Highest month-end balance		$ 150,000
Average outstanding balance		$ 23,059
Weighted-average interest rate paid (as a percent)		4.45%
Short-term FHLB repo advance:
Short-term borrowings
Highest month-end balance		$ 400,000
Average outstanding balance		$ 156,319
Weighted-average interest rate paid (as a percent)		5.25%
FHLB
Short-term borrowings
Short-term borrowings	250,000		500,000
Borrowing capacity	$ 2,900,000		$ 2,500,000
Weighted-average interest rate (as a percent)	4.16%	4.71%	4.71%
Highest month-end balance	$ 500,000	$ 500,000
Average outstanding balance	$ 483,577	$ 20,147
Weighted-average interest rate paid (as a percent)	4.78%	4.34%