Derivative Financial Instruments Derivative Financial Instruments (Narrative) (Detail) (USD $)	3 Months Ended												3 Months Ended					3 Months Ended					3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Interest Rate Cap [Member] De-designated Hedge [Member]	Mar. 31, 2014 Interest Rate Cap [Member] Not Designated as Hedging Instrument [Member] contracts	Mar. 31, 2014 Interest Rate Contract [Member] Not Designated as Hedging Instrument [Member]	Mar. 31, 2014 Forward Commitments to Sell Mortgage Loans [Member]	Mar. 31, 2014 Interest Rate Lock Commitments [Member]	Mar. 31, 2014 Foreign Exchange Contract [Member]	Mar. 31, 2014 Call Options Written [Member] derivative_instruments	Dec. 31, 2013 Call Options Written [Member] derivative_instruments	Mar. 31, 2013 Call Options Written [Member] derivative_instruments	Mar. 31, 2014 Minimum [Member]	Mar. 31, 2014 Maximum [Member]	Mar. 31, 2014 Cash Flow Hedging [Member] Interest Rate Contract [Member] Designated as Hedging Instrument [Member]	Mar. 31, 2013 Cash Flow Hedging [Member] Interest Rate Contract [Member] Designated as Hedging Instrument [Member]	Mar. 31, 2014 Fair Value Hedging [Member] Interest Rate Swap [Member] Designated as Hedging Instrument [Member] derivative_instruments	Mar. 31, 2014 Fair Value Hedging [Member] Interest Rate Contract [Member] Designated as Hedging Instrument [Member]	Mar. 31, 2013 Fair Value Hedging [Member] Interest Rate Contract [Member] Designated as Hedging Instrument [Member]	Mar. 31, 2014 Cash flow hedge of variable rate deposits [Member] Cash Flow Hedging [Member] Interest Rate Cap [Member] Designated as Hedging Instrument [Member] derivative_instruments	Mar. 31, 2014 Interest Rate Cap Two Hundred Sixteen Million Five Hundred Thousand Notional August Two Thousand Sixteen Maturity [Member] Cash Flow Hedging [Member] Designated as Hedging Instrument [Member]	Mar. 31, 2014 Interest Rate Cap Forty Three Million Five Hundred Thousand Notional August Two Thousand Sixteen Maturity [Member] [Member] Cash Flow Hedging [Member] Designated as Hedging Instrument [Member]	Jun. 30, 2013 cash flow hedge of junior subordinated debentures [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Designated as Hedging Instrument [Member]	Mar. 31, 2014 cash flow hedge of junior subordinated debentures [Member] Cash Flow Hedging [Member] Interest Rate Swap [Member] Designated as Hedging Instrument [Member] derivative_instruments	Mar. 31, 2014 cash flow hedge of junior subordinated debentures [Member] Cash Flow Hedging [Member] Interest Rate Cap [Member] Designated as Hedging Instrument [Member] derivative_instruments	Jun. 30, 2013 cash flow hedge of junior subordinated debentures [Member] Cash Flow Hedging [Member] Interest Rate Cap [Member] Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Number of Interest Rate Derivatives Held					6												3			2				2	4
Notional Amount				$ 96,500,000	$ 620,000,000	$ 2,900,000,000	$ 445,000,000	$ 306,600,000	$ 1,800,000								$ 5,800,000				$ 216,500,000	$ 43,500,000				$ 90,000,000
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net															0	0
Amount reclassified from accumulated other comprehensive income to interest expense	1,900,000
Income Statement Gain/(Loss) due to Hedge Ineffectiveness																		(2,000)	(1,000)
Fair value hedges recognized interest income	10,000	2,000
Basis Amortization of Hedged item no longer in a Hedging Relationship	43,000
Derivative, Maturity Date													Apr. 30, 2014	Jan. 31, 2033									Sep. 30, 2013
Loans Held-for-sale, Fair Value Disclosure	215,231,000	380,922,000	334,327,000
Derivative, Number of Instruments Held										0	0	0
Derivative, Net Liability Position, Aggregate Fair Value	26,200,000
Security Owned and Pledged as Collateral, Fair Value	$ 37,100,000		$ 34,600,000