Derivative Financial Instruments Derivative Financial Instruments (Schedule Of Fair Value Of Derivative Financial Instruments) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Derivative [Line Items]
Derivative Assets, Fair Value, Amount not Offset Against Collateral	$ 37,239	$ 37,956	$ 46,653
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	34,990	34,807	50,262
Other Assets [Member]
Derivative [Line Items]
Derivative Assets, Fair Value, Amount not Offset Against Collateral	51,529	48,221	52,436
Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Fair Value, Amount not Offset Against Collateral	2,668	1,883	94
Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Fair Value, Amount not Offset Against Collateral	48,861	46,338	52,342
Other Liabilities [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	37,797	37,264	54,745
Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	2,893	3,161	6,556
Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	34,904	34,103	48,189
Interest Rate Contract [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Fair Value, Amount not Offset Against Collateral	34,571	36,073	46,559
Interest Rate Contract [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	32,097	31,646	43,706
Interest Rate Contract [Member] | Cash Flow Hedging [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Fair Value, Amount not Offset Against Collateral	2,578	1,776	1
Interest Rate Contract [Member] | Cash Flow Hedging [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	2,892	3,160	6,556
Interest Rate Contract [Member] | Fair Value Hedging [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Fair Value, Amount not Offset Against Collateral	90	107	93
Interest Rate Contract [Member] | Fair Value Hedging [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	1	1	0
Interest Rate Lock Commitments [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Fair Value, Amount not Offset Against Collateral	13,658	7,500	5,551
Interest Rate Lock Commitments [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	115	147	1,315
Forward Commitments to Sell Mortgage Loans [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Fair Value, Amount not Offset Against Collateral	625	2,761	213
Forward Commitments to Sell Mortgage Loans [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	2,688	2,310	3,015
Foreign Exchange Contract [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Fair Value, Amount not Offset Against Collateral	7	4	19
Foreign Exchange Contract [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	$ 4	$ 0	$ 153