Short-Term Borrowings (Short-Term Borrowings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Short-term Debt [Line Items]
Amount outstanding at period end	$ 1,154,829	$ 1,871,271
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Amount outstanding at period end	350	1,850
Average amount outstanding during period	7,525	13,176
Maximum amount at any month end during period	$ 100,350	$ 2,350
Weighted-average interest at period end	4.90%	3.90%
Weighted-average interest rate during period	5.70%	2.82%
Securities Sold Under Agreements to Repurchase [Member]
Short-term Debt [Line Items]
Amount outstanding at period end	$ 454,479	$ 444,421
Average amount outstanding during period	513,306	536,727
Maximum amount at any month end during period	$ 625,773	$ 640,592
Weighted-average interest at period end	1.16%	0.53%
Weighted-average interest rate during period	1.36%	0.21%
FHLB Borrowings [Member]
Short-term Debt [Line Items]
Amount outstanding at period end	$ 700,000	$ 1,425,000
Average amount outstanding during period	1,172,603	808,784
Maximum amount at any month end during period	$ 3,100,000	$ 1,425,000
Weighted-average interest at period end	5.58%	4.70%
Weighted-average interest rate during period	5.05%	1.82%