Derivative Financial Instruments (Schedule Of Fair Value Of Derivative Financial Instruments) (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Derivative [Line Items]
Derivative, Notional Amount	$ 315,000,000
Derivative Asset, Fair Value, Net	38,118,000	47,546,000	45,430,000
Derivative liabilities, Fair Value	33,788,000	53,755,000	53,455,000
Other Assets [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	60,554,000	53,906,000	53,666,000
Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	2,240,000	106,000	409,000
Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	58,314,000	53,800,000	53,257,000
Other Liabilities [Member]
Derivative [Line Items]
Derivative liabilities, Fair Value	37,654,000	57,751,000	61,380,000
Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities, Fair Value	4,416,000	7,988,000	9,918,000
Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities, Fair Value	33,238,000	49,763,000	51,462,000
Cash Flow Hedges [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	2,146,000	2,000	17,000
Cash Flow Hedges [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities, Fair Value	4,416,000	7,988,000	9,918,000
Fair Value Hedges [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	94,000	104,000	392,000
Fair Value Hedges [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities, Fair Value	0	0	0
Interest Rate Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	2,500,000,000
Interest Rate Contract [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	35,878,000	47,440,000	45,021,000
Interest Rate Contract [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities, Fair Value	29,372,000	45,767,000	43,537,000
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivative, Notional Amount	496,200,000
Interest Rate Lock Commitments [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	14,579,000	6,069,000	8,062,000
Interest Rate Lock Commitments [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities, Fair Value	3,208,000	937,000	3,847,000
Forward Commitments To Sell Mortgage Loans [Member]
Derivative [Line Items]
Derivative, Notional Amount	1,000,000,000
Forward Commitments To Sell Mortgage Loans [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	7,835,000	277,000	111,000
Forward Commitments To Sell Mortgage Loans [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities, Fair Value	583,000	3,057,000	4,072,000
Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	4,800,000
Foreign Exchange Contract [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	22,000	14,000	63,000
Foreign Exchange Contract [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities, Fair Value	75,000	2,000	6,000
Interest Rate Caps 3 [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Derivative, Notional Amount	50,000,000
Interest Rate Derivatives, at Fair Value, Net	1,175,000
Interest Rate Caps 4 [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Derivative, Notional Amount	40,000,000
Interest Rate Derivatives, at Fair Value, Net	$ 969,000