Derivatives and Hedging Activities (Details 2) (Not Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Gains and losses recognized in income on non-designated hedging instruments
Gains and losses recognized in income on derivatives	$ 1,246	$ 349	$ 584	$ 947
Mortgage loan commitments [Member] | Other income [Member]
Gains and losses recognized in income on non-designated hedging instruments
Gains and losses recognized in income on derivatives	(3,374)	1,980	(3,622)	289
Forward sales contracts [Member] | Other income [Member]
Gains and losses recognized in income on non-designated hedging instruments
Gains and losses recognized in income on derivatives	4,742	(1,646)	4,519	598
Credit Risk Contract [Member] | Other income [Member]
Gains and losses recognized in income on non-designated hedging instruments
Gains and losses recognized in income on derivatives	(122)	15	(313)	60
Other [Member] | Other Expenses [Member]
Gains and losses recognized in income on non-designated hedging instruments
Gains and losses recognized in income on derivatives	$ 0	$ 0	$ 0	$ 0