Derivative Financial Instruments (Schedule of Fair Value of Derivative Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Other Assets [Member]
Derivative [Line Items]
Derivative Assets	$ 53,906	$ 38,607
Other Assets [Member] | Derivatives Designated as Hedging Instruments Under ASC 815 [Member]
Derivative [Line Items]
Derivative Assets	106	119
Other Assets [Member] | Derivatives Designated as Hedging Instruments Under ASC 815 [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Derivative Assets	2	119
Other Assets [Member] | Derivatives Designated as Hedging Instruments Under ASC 815 [Member] | Fair Value Hedges [Member]
Derivative [Line Items]
Derivative Assets	104	0
Other Assets [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member]
Derivative [Line Items]
Derivative Assets	53,800	38,488
Other Assets [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Interest Rate Derivatives [Member]
Derivative [Line Items]
Derivative Assets	47,440	34,002
Other Assets [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivative Assets	6,069	4,307
Other Assets [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Forward Commitments to Sell Mortgage Loans [Member]
Derivative [Line Items]
Derivative Assets	277	179
Other Assets [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	14	0
Other Liabilities [Member]
Derivative [Line Items]
Derivative Liabilities	57,751	50,081
Other Liabilities [Member] | Derivatives Designated as Hedging Instruments Under ASC 815 [Member]
Derivative [Line Items]
Derivative Liabilities	7,988	11,032
Other Liabilities [Member] | Derivatives Designated as Hedging Instruments Under ASC 815 [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Derivative Liabilities	7,988	11,032
Other Liabilities [Member] | Derivatives Designated as Hedging Instruments Under ASC 815 [Member] | Fair Value Hedges [Member]
Derivative [Line Items]
Derivative Liabilities	0	0
Other Liabilities [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member]
Derivative [Line Items]
Derivative Liabilities	49,763	39,049
Other Liabilities [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Interest Rate Derivatives [Member]
Derivative [Line Items]
Derivative Liabilities	45,767	33,892
Other Liabilities [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivative Liabilities	937	127
Other Liabilities [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Forward Commitments to Sell Mortgage Loans [Member]
Derivative [Line Items]
Derivative Liabilities	3,057	5,030
Other Liabilities [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Liabilities	$ 2	$ 0