Derivative Financial Instruments (Fair Value Of Derivative Financial Instruments Designated As Cash Flow Hedges) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012 Derivative	Dec. 31, 2011 Derivative
Interest Rate Swaps On FHLB Advances [Member]
Derivative [Line Items]
Interest rate derivatives designated as hedges of cash flow, # of Instruments	1	1
Interest rate derivatives designated as hedges of cash flow, Notional Amount	$ 100,000	$ 100,000
Interest rate derivatives designated as hedges of cash flow, Estimated Fair Value	(861)	(1,521)
Forward Settle Interest Rate Swap On Anticipated Debt [Member]
Derivative [Line Items]
Interest rate derivatives designated as hedges of cash flow, # of Instruments	6	4
Interest rate derivatives designated as hedges of cash flow, Notional Amount	200,000	200,000
Interest rate derivatives designated as hedges of cash flow, Estimated Fair Value	$ (14,524)	$ (15,050)