Derivative Financial Instruments (Schedule of Fair Value of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Derivative Assets	$ 42,779	$ 37,841
Derivative liabilities	42,458	36,921
Other Assets
Derivative [Line Items]
Derivative Assets	51,298	47,964
Other Assets | Designated as hedging instrument
Derivative [Line Items]
Derivative Assets	269	1,442
Other Assets | Not designed as hedging instrument
Derivative [Line Items]
Derivative Assets	51,029	46,522
Other Assets | Not designed as hedging instrument | Interest Rate Derivatives
Derivative [Line Items]
Derivative Assets	42,510	36,399
Other Assets | Not designed as hedging instrument | Interest Rate Lock Commitments
Derivative [Line Items]
Derivative Assets	7,401	10,028
Other Assets | Not designed as hedging instrument | Forward commitments to sell mortgage loans
Derivative [Line Items]
Derivative Assets	745	23
Other Assets | Not designed as hedging instrument | Foreign Exchange Contract
Derivative [Line Items]
Derivative Assets	373	72
Other Liabilities
Derivative [Line Items]
Derivative liabilities	45,019	41,180
Other Liabilities | Designated as hedging instrument
Derivative [Line Items]
Derivative liabilities	989	1,994
Other Liabilities | Not designed as hedging instrument
Derivative [Line Items]
Derivative liabilities	44,030	39,186
Other Liabilities | Not designed as hedging instrument | Interest Rate Derivatives
Derivative [Line Items]
Derivative liabilities	41,469	34,927
Other Liabilities | Not designed as hedging instrument | Interest Rate Lock Commitments
Derivative [Line Items]
Derivative liabilities	171	20
Other Liabilities | Not designed as hedging instrument | Forward commitments to sell mortgage loans
Derivative [Line Items]
Derivative liabilities	2,275	4,239
Other Liabilities | Not designed as hedging instrument | Foreign Exchange Contract
Derivative [Line Items]
Derivative liabilities	115	0
Cash flow hedging | Other Assets | Designated as hedging instrument | Interest Rate Derivatives
Derivative [Line Items]
Derivative Assets	242	1,390
Cash flow hedging | Other Liabilities | Designated as hedging instrument | Interest Rate Derivatives
Derivative [Line Items]
Derivative liabilities	846	1,994
Fair value hedging | Other Assets | Designated as hedging instrument | Interest Rate Derivatives
Derivative [Line Items]
Derivative Assets	27	52
Fair value hedging | Other Liabilities | Designated as hedging instrument | Interest Rate Derivatives
Derivative [Line Items]
Derivative liabilities	$ 143	$ 0