Securities Sold Under Agreements To Repurchase And Other Borrowings (Summary Of Securities Sold Under Agreements To Repurchase And Other Short-Term Borrowings) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Securities Sold Under Agreements to Repurchase and Other Short-term Borrowings [Line Items]
Securities sold under agreements to repurchase	$ 1,009,662	$ 1,076,160
Federal funds purchased	322,000	0
Securities sold under agreements to repurchase and other borrowings	1,331,662	1,076,160
Original maturity of one year or less [Member]
Securities Sold Under Agreements to Repurchase and Other Short-term Borrowings [Line Items]
Securities sold under agreements to repurchase	359,662	326,160
Callable at the option of the counterparty [Member]
Securities Sold Under Agreements to Repurchase and Other Short-term Borrowings [Line Items]
Securities sold under agreements to repurchase	100,000	300,000
Non-callable [Member]
Securities Sold Under Agreements to Repurchase and Other Short-term Borrowings [Line Items]
Securities sold under agreements to repurchase	$ 550,000	$ 450,000