Derivative Financial Instruments (Fair Value Of Derivative Financial Instruments Designated As Cash Flow Hedges) (Detail) (USD $)	Sep. 30, 2013	Sep. 26, 2013 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Forward-settle interest rate swap on anticipated debt [Member]	Sep. 10, 2013 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Forward-settle interest rate swap on anticipated debt [Member] Derivative	Sep. 30, 2013 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Federal Home Loan Bank Advances [Member] Interest rate cap on FHLB advances [Member] Derivative	Sep. 30, 2013 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Other Liabilities 2 [Member] Forward-settle interest rate swap on anticipated debt [Member] Derivative		Dec. 31, 2012 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Other Liabilities 2 [Member] Forward-settle interest rate swap on anticipated debt [Member] Derivative		Sep. 30, 2013 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Other Liabilities [Member] Forward-settle interest rate swap on anticipated debt [Member] Derivative	Dec. 31, 2012 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Other Liabilities [Member] Forward-settle interest rate swap on anticipated debt [Member] Derivative	Sep. 30, 2013 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Other Liabilities [Member] Federal Home Loan Bank Advances [Member] Interest Rate Swap on FHLB advances [Member] Derivative	Dec. 31, 2012 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Other Liabilities [Member] Federal Home Loan Bank Advances [Member] Interest Rate Swap on FHLB advances [Member] Derivative	Sep. 30, 2013 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Other Assets [Member] Federal Home Loan Bank Advances [Member] Interest rate cap on FHLB advances [Member] Derivative	Dec. 31, 2012 Designated as Hedging Instrument [Member] Cash Flow Hedging [Member] Other Assets [Member] Federal Home Loan Bank Advances [Member] Interest rate cap on FHLB advances [Member] Derivative
Derivative [Line Items]
Inter-affiliate swaps	$ 100,000,000
Number of Instruments		2	4	2	2	[1]	0	[1]	4	4	0	1	2	0
Derivative Asset, Notional Amount				25,000,000									50,000,000	0
Derivative Liability, Notional Amount		25,000,000	25,000,000		50,000,000	[1]	0	[1]	100,000,000	100,000,000	0	100,000,000
Derivative Asset, Estimated Fair Value													3,048,000	0
Derivative Liability, Estimated Fair Value					$ (901,000)	[1]	$ 0	[1]	$ (1,293,000)	$ (1,130,000)	$ 0	$ (497,000)

[1] Inter-affiliate swaps between the Bank and holding company total an additional $100 million in aggregate notional value with gains and losses that offset.