Short-Term Borrowings (Short-Term Borrowings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Short-term Debt [Line Items]
Amount outstanding at period end	$ 1,871,271	$ 1,665,061
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Amount outstanding at period end	1,850	1,850
Average amount outstanding during period	13,176	3,762
Maximum amount at any month end during period	$ 2,350	$ 4,400
Weighted-average interest at period end	3.90%	0.15%
Weighted-average interest rate during period	2.82%	0.43%
Securities Sold Under Agreements to Repurchase [Member]
Short-term Debt [Line Items]
Amount outstanding at period end	$ 444,421	$ 563,211
Average amount outstanding during period	536,727	559,410
Maximum amount at any month end during period	$ 640,592	$ 643,403
Weighted-average interest at period end	0.53%	0.05%
Weighted-average interest rate during period	0.21%	0.10%
FHLB Borrowings [Member]
Short-term Debt [Line Items]
Amount outstanding at period end	$ 1,425,000	$ 1,100,000
Average amount outstanding during period	808,784	1,100,000
Maximum amount at any month end during period	$ 1,425,000	$ 1,100,000
Weighted-average interest at period end	4.70%	0.49%
Weighted-average interest rate during period	1.82%	0.49%