Short-Term Borrowings - Components and Selected Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Short-term borrowings
Short-term borrowings		$ 75,000
Long-term borrowings	$ 500,000	0
Federal Home Loan Bank
Short-term borrowings
Borrowing capacity	2,900,000	2,500,000
Federal Reserve Bank Advances [Member]
Short-term borrowings
Borrowing capacity	3,800,000	1,200,000
Federal Funds Purchased [Member]
Short-term borrowings
Short-term borrowings		$ 75,000
Annual interest rate		4.35%
Highest month-end balance	150,000
Average outstanding balance	$ 34,779
Weighted-average interest rate paid (as a percent)	4.45%
Federal Home Loan Bank
Short-term borrowings
Short-term borrowings	$ 0
Highest month-end balance	400,000
Average outstanding balance	$ 208,702
Weighted-average interest rate paid (as a percent)	5.14%