Derivative Financial Instruments (Schedule of Fair Value of Derivative Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Derivative Assets	$ 37,841	$ 37,956
Derivative liabilities	36,921	34,807
Other Assets [Member]
Derivative [Line Items]
Derivative Assets	47,964	48,221
Other Assets [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets	1,442	1,883
Other Assets [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member]
Derivative [Line Items]
Derivative Assets	46,522	46,338
Other Assets [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Interest Rate Derivatives [Member]
Derivative [Line Items]
Derivative Assets	36,399	36,073
Other Assets [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivative Assets	10,028	7,500
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	23	2,761
Other Assets [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	72	4
Other Liabilities [Member]
Derivative [Line Items]
Derivative liabilities	41,180	37,264
Other Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative liabilities	1,994	3,161
Other Liabilities [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member]
Derivative [Line Items]
Derivative liabilities	39,186	34,103
Other Liabilities [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Interest Rate Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	34,927	31,646
Other Liabilities [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Derivative liabilities	20	147
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	4,239	2,310
Other Liabilities [Member] | Derivatives Not Designed as Hedging Instruments Under ASC 815 [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative liabilities	0	0
Cash Flow Hedging [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member] | Interest Rate Derivatives [Member]
Derivative [Line Items]
Derivative Assets	1,390	1,776
Cash Flow Hedging [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member] | Interest Rate Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	1,994	3,160
Fair Value Hedging [Member] | Other Assets [Member] | Designated as Hedging Instrument [Member] | Interest Rate Derivatives [Member]
Derivative [Line Items]
Derivative Assets	52	107
Fair Value Hedging [Member] | Other Liabilities [Member] | Designated as Hedging Instrument [Member] | Interest Rate Derivatives [Member]
Derivative [Line Items]
Derivative liabilities	$ 0	$ 1