Derivative Financial Instruments (Schedule Of Fair Value Of Derivative Financial Instruments) (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Other Assets [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	$ 52,436,000	$ 53,906,000	$ 39,220,000
Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	94,000	106,000	61,000
Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	52,342,000	53,800,000	39,159,000
Other Liabilities [Member]
Derivative [Line Items]
Derivative liabilities, Fair Value	54,745,000	57,751,000	46,364,000
Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities, Fair Value	6,556,000	7,988,000	10,178,000
Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities, Fair Value	48,189,000	49,763,000	36,186,000
Cash Flow Hedges [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	1,000	2,000	61,000
Cash Flow Hedges [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities, Fair Value	6,556,000	7,988,000	10,178,000
Fair Value Hedges [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	93,000	104,000	0
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] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	46,559,000	47,440,000	34,966,000
Interest Rate Contract [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities, Fair Value	43,706,000	45,767,000	34,706,000
Interest Rate Lock Commitments [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	5,551,000	6,069,000	3,789,000
Interest Rate Lock Commitments [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities, Fair Value	1,315,000	937,000	368,000
Forward Commitments To Sell Mortgage Loans [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	213,000	277,000	404,000
Forward Commitments To Sell Mortgage Loans [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities, Fair Value	3,015,000	3,057,000	1,112,000
Foreign Exchange Contract [Member] | Other Assets [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Net	19,000	14,000	0
Foreign Exchange Contract [Member] | Other Liabilities [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities, Fair Value	$ 153,000	$ 2,000	$ 0