Short-Term Borrowings - Components and Selected Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Short-term borrowings
Short-term borrowings	$ 500,000	$ 75,000
FHLB
Short-term borrowings
Borrowing capacity	2,500,000	2,500,000
Federal Reserve Bank Advances [Member]
Short-term borrowings
Borrowing capacity	3,300,000	1,200,000
Federal funds purchased:
Short-term borrowings
Short-term borrowings		$ 75,000
Annual interest rate		4.35%
Weighted-average interest rate (as a percent)		4.35%
Highest month-end balance	150,000	$ 75,000
Average outstanding balance	$ 17,247	$ 11,521
Weighted-average interest rate paid (as a percent)	4.45%	4.08%
Short-term FHLB repo advance:
Short-term borrowings
Highest month-end balance	$ 400,000
Average outstanding balance	$ 116,918
Weighted-average interest rate paid (as a percent)	5.25%
FHLB
Short-term borrowings
Short-term borrowings	$ 500,000
Incurred fees related to early termination			$ 9,000
Weighted-average interest rate (as a percent)	4.71%
Highest month-end balance	$ 500,000
Average outstanding balance	$ 144,932
Weighted-average interest rate paid (as a percent)	4.75%