Derivative and Hedging Activities (Details Textuals) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Derivative and Hedging Activities (Textuals) [Abstract]
Investment securities and cash equivalents pledged as collateral	$ 81,000,000		$ 94,000,000
Recognized ineffectiveness	100,000	100,000	200,000
Deferred After Tax Loss	1,900,000		3,500,000
Net gain on interest rate lock commitments	1,300,000	6,000,000	(100,000)
Net gain on mortgage derivatives	1,100,000	600,000	5,500,000
Residential Mortgage loan held for sale to individual	151,000,000	265,000,000	129,000,000
Net gain/ loss on forward commitments	(200,000)	(6,600,000)	5,600,000
Residential Mortgage loan held for sale to various investors	203,000,000	437,000,000	281,000,000
Fair Value net gain	200,000	200,000	300,000
Interest rate-related instruments - customer and mirror [Member] | Capital market fees [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) on free standing derivatives	(3,668,000)	(2,572,000)	(1,900,000)
Loan [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Foreign Currency Derivatives	14,000,000	4,000,000	5,000,000
Customer [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Foreign Currency Derivatives	33,000,000	23,000,000	50,000,000
Mirror [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount of Foreign Currency Derivatives	$ 33,000,000	$ 23,000,000	$ 50,000,000
Interest rate swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swap agreements	2