Derivative Financial Instruments (Schedule Of Fair Value Of Derivative Financial Instruments) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Derivative [Line Items]
Derivative Assets, Fair Value, Amount not Offset Against Collateral	$ 41,945	$ 47,546	$ 50,349
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	38,804	53,755	58,008
Other Assets [Member]
Derivative [Line Items]
Derivative Assets, Fair Value, Amount not Offset Against Collateral	57,573	53,906	65,990
Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Fair Value, Amount not Offset Against Collateral	1,820	106	159
Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Fair Value, Amount not Offset Against Collateral	55,753	53,800	65,831
Other Liabilities [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	49,300	57,751	79,977
Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	3,446	7,988	9,491
Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	45,854	49,763	70,486
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	40,125	47,440	50,190
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	35,358	45,767	48,517
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	15,599	6,069	15,614
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	5,097	937	10,392
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	23	277	16
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	5,373	3,057	11,568
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	6	14	11
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	26	2	9
Cash Flow Hedging [Member] | Interest Rate Contract [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Fair Value, Amount not Offset Against Collateral	1,738	2	6
Cash Flow Hedging [Member] | Interest Rate Contract [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	3,444	7,988	9,491
Fair Value Hedging [Member] | Interest Rate Contract [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets, Fair Value, Amount not Offset Against Collateral	82	104	153
Fair Value Hedging [Member] | Interest Rate Contract [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liabilities, Fair Value, Amount Not Offset Against Collateral	$ 2	$ 0	$ 0