Short-Term Borrowings (Short-Term Borrowings) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Short-term Debt [Line Items]
Amount outstanding at period end	$ 639,015,000	$ 1,154,829,000
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Amount outstanding at period end	300,000	350,000
Average amount outstanding during period	12,935,000	7,525,000
Maximum amount at any month end during period	$ 200,275,000	$ 100,350,000
Weighted-average interest rate at period end	3.90%	4.90%
Weighted-average interest rate during period	5.61%	5.70%
Securities Sold Under Agreements to Repurchase [Member]
Short-term Debt [Line Items]
Amount outstanding at period end	$ 638,715,000	$ 454,479,000
Average amount outstanding during period	639,912,000	513,306,000
Maximum amount at any month end during period	$ 792,589,000	$ 625,773,000
Weighted-average interest rate at period end	0.95%	1.16%
Weighted-average interest rate during period	1.65%	1.36%
FHLB Borrowings [Member]
Short-term Debt [Line Items]
Amount outstanding at period end	$ 0	$ 700,000,000
Average amount outstanding during period	238,593,000	1,172,603,000
Maximum amount at any month end during period	$ 650,000,000	$ 3,100,000,000
Weighted-average interest rate at period end	0.00%	5.58%
Weighted-average interest rate during period	5.48%	5.05%