Derivative Financial Instruments (Net Impact On Interest Expense Related To Cash Flow Hedges) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative [Line Items]
Interest Expense	$ 21,766	$ 27,326	$ 69,085	$ 88,320
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Interest Expense	0	351	498	1,018
Amount Reclassified From AOCI	2,182	1,932	7,090	5,371
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Federal Home Loan Bank Advances [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Interest Expense	0	351	498	1,018
Amount Reclassified From AOCI	1,353	1,139	4,604	3,417
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Subordinated debt [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Interest Expense	0	0	0	0
Amount Reclassified From AOCI	0	(21)	(3)	(70)
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Repurchase agreements [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Interest Expense	0	0	0	0
Amount Reclassified From AOCI	829	830	2,489	2,129
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Pooled trust preferred securities [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Interest Expense	0	0	0	0
Amount Reclassified From AOCI	0	(16)	0	(105)
Fair Value Hedging [Member] | Interest Expense [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Net impact on interest expense on borrowings	(799)	(1,420)	(2,605)	(4,426)
Fair Value Hedging [Member] | Interest Expense [Member] | Designated as Hedging Instrument [Member] | Senior notes [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Net impact on interest expense on borrowings	(799)	(799)	(2,398)	(2,398)
Fair Value Hedging [Member] | Interest Expense [Member] | Designated as Hedging Instrument [Member] | Subordinated debt [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Net impact on interest expense on borrowings	$ 0	$ (621)	$ (207)	$ (2,028)