Derivatives and Hedging Activities (Details 2) (Not Designated as Hedging Instrument, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	$ (3,393)	$ 1,259	$ (2,809)	$ 2,206
Mortgage loan commitments | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	1,950	2,146	(1,672)	2,435
Forward sales contracts | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	(5,538)	(1,023)	(1,019)	(425)
Credit Risk Contract | Other income
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	195	136	(118)	196
Other | Other Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gains and losses recognized in income on derivatives	$ 0	$ 0	$ 0	$ 0