Derivative Instruments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Designated as hedging instruments [Member]
Derivative financial instruments
Derivative assets	$ 10	$ 0
Derivative liabilities	232	2,164
Not designated as hedging instruments [Member]
Derivative financial instruments
Derivative assets	6,499	4,654
Derivative liabilities	2,432	3,350
Other Assets [Member] | Designated as hedging instruments [Member] | Interest rate swaps [Member]
Derivative financial instruments
Derivative assets	10	0
Other Assets [Member] | Not designated as hedging instruments [Member] | Interest rate contracts [Member]
Derivative financial instruments
Derivative assets	1,824	3,083
Other Assets [Member] | Not designated as hedging instruments [Member] | Interest rate lock commitments [Member]
Derivative financial instruments
Derivative assets	76	1,571
Other Assets [Member] | Not designated as hedging instruments [Member] | Forward commitments [Member]
Derivative financial instruments
Derivative assets	4,599	0
Other Liabilities [Member] | Designated as hedging instruments [Member] | Interest rate swaps [Member]
Derivative financial instruments
Derivative liabilities	232	2,164
Other Liabilities [Member] | Not designated as hedging instruments [Member] | Interest rate contracts [Member]
Derivative financial instruments
Derivative liabilities	1,826	3,152
Other Liabilities [Member] | Not designated as hedging instruments [Member] | Interest rate lock commitments [Member]
Derivative financial instruments
Derivative liabilities	606	0
Other Liabilities [Member] | Not designated as hedging instruments [Member] | Forward commitments [Member]
Derivative financial instruments
Derivative liabilities	$ 0	$ 198