Borrowings (Summary Of Securities Sold Under Agreements To Repurchase And Other Borrowings) (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2022 USD ($) loan	Dec. 31, 2021 USD ($)
Assets Sold under Agreements to Repurchase [Line Items]
Amount of long-term debt agreements extinguished | loan	2
Amount of debt extinguished	$ 100,000
Proceeds from extinguishment of borrowings	2,500
Securities sold under agreements to repurchase
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 312,089	$ 674,896
Rate	0.11%	0.47%
Federal funds purchased
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 953,325	$ 0
Rate	3.17%	0.00%
Securities sold under agreements to repurchase and other borrowings
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 1,265,414	$ 674,896
Rate	2.41%	0.47%
Original maturity of one year or less | Securities sold under agreements to repurchase
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 312,089	$ 474,896
Rate	0.11%	0.11%
Original maturity of greater than one year, non-callable (2) | Securities sold under agreements to repurchase
Assets Sold under Agreements to Repurchase [Line Items]
Total Outstanding	$ 0	$ 200,000
Rate	0.00%	1.32%