Derivative Instruments And Hedging Activities (Narrative) (Details) (USD $)	3 Months Ended									3 Months Ended							3 Months Ended			3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Not Designated As Hedging Instrument [Member]	Mar. 31, 2011 Not Designated As Hedging Instrument [Member]	Mar. 31, 2012 Designated As Hedging Instrument [Member]	Mar. 31, 2011 Designated As Hedging Instrument [Member]	Mar. 31, 2012 Interest Rate Swaps [Member]	Dec. 31, 2011 Interest Rate Swaps [Member]	Mar. 31, 2012 Interest Rate Swaps [Member] Not Designated As Hedging Instrument [Member]	Mar. 31, 2012 Interest Rate Swaps [Member] Designated As Hedging Instrument [Member]	Mar. 31, 2011 Interest Rate Swaps [Member] Designated As Hedging Instrument [Member]	Mar. 31, 2012 Interest Rate Caps [Member]	Mar. 31, 2011 Interest Rate Caps [Member]	Mar. 31, 2012 Consumer And Commercial Money Market Deposit Accounts [Member] Interest Rate Swaps [Member] Designated As Hedging Instrument [Member]	Mar. 31, 2012 Consumer And Commercial Money Market Deposit Accounts [Member] Interest Rate Swaps [Member] Minimum [Member] Designated As Hedging Instrument [Member]	Mar. 31, 2012 Consumer And Commercial Money Market Deposit Accounts [Member] Interest Rate Swaps [Member] Maximum [Member] Designated As Hedging Instrument [Member]	Mar. 31, 2012 Consumer And Commercial Money Market Deposit Accounts [Member] Interest Rate Caps [Member] Designated As Hedging Instrument [Member]	Mar. 31, 2012 Consumer And Commercial Money Market Deposit Accounts [Member] Interest Rate Caps [Member] Minimum [Member] Designated As Hedging Instrument [Member]	Mar. 31, 2012 Consumer And Commercial Money Market Deposit Accounts [Member] Interest Rate Caps [Member] Maximum [Member] Designated As Hedging Instrument [Member]	Mar. 31, 2012 Consumer Repurchase Agreements And Money Market Deposit Accounts [Member] Interest Rate Caps [Member] Designated As Hedging Instrument [Member]	Mar. 31, 2012 Consumer Repurchase Agreements And Money Market Deposit Accounts [Member] Interest Rate Caps [Member] Minimum [Member] Designated As Hedging Instrument [Member]	Mar. 31, 2012 Consumer Repurchase Agreements And Money Market Deposit Accounts [Member] Interest Rate Caps [Member] Maximum [Member] Designated As Hedging Instrument [Member]	Mar. 31, 2012 Commercial Lending [Member] Interest Rate Swaps [Member] Designated As Hedging Instrument [Member]	Mar. 31, 2012 Certificates Of Deposit [Member] Interest Rate Swaps [Member] Designated As Hedging Instrument [Member]	Mar. 31, 2012 Fixed Rate At Approximately 5.11% [Member] Designated As Hedging Instrument [Member]	Mar. 31, 2012 Fixed Rate At Approximately 5.11% [Member] Certificates Of Deposit [Member] Consumer And Commercial Money Market Deposit Accounts [Member] Interest Rate Swaps [Member] Designated As Hedging Instrument [Member]	Mar. 31, 2012 Fixed Rate At Approximately 4.73% [Member] Designated As Hedging Instrument [Member]	Mar. 31, 2012 Fixed Rate At Approximately 4.73% [Member] Certificates Of Deposit [Member] Consumer And Commercial Money Market Deposit Accounts [Member] Interest Rate Swaps [Member] Designated As Hedging Instrument [Member]	Mar. 31, 2012 State Bancorp Inc [Member] Interest Rate Swaps [Member] Not Designated As Hedging Instrument [Member]
Derivative [Line Items]
Derivative instruments held									24																				14
Aggregate notional amount of interest rate derivatives														$ 300,000,000			$ 100,000,000			$ 100,000,000
Strike rate																		6.00%	6.25%		2.50%	2.75%
Maturity date, derivative instrument																	July 15, 2015			May 1, 2013
Interest rate of swaps																5.11%
Derivative instruments, gain (loss) not designated as hedges	216,000	21,000	(130,000)	(160,000)	130,000	160,000
Notional amount of interest rate derivatives									98,800,000														8,900,000	51,000,000	100,000,000		200,000,000		18,000,000
Gain (loss) on cash flow hedge ineffectiveness												73,000	50,000
Accumulated net after-tax loss related to effective cash flow hedges							11,400,000	13,100,000
Estimated amount of interest rate derivatives to be reclassified to interest expense							7,200,000
Aggregate fair value of net liability position	19,900,000
Reduction to interest expense, net										136,000	44,000
Fixed interest rate															4.73%
Collateral posted with counterparties	$ 18,300,000
Interest rate swap, starting date																										July 2012
Interest rate swap, expiration date																										July 2017		October 2016