Derivative Financial Instruments (Schedule of Fair Value of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative Assets	$ 49,213	$ 42,779
Derivative liabilities	37,665	42,458
Other Assets
Derivative [Line Items]
Derivative Assets	56,394	51,298
Other Assets | Designated as hedging instrument
Derivative [Line Items]
Derivative Assets	10,239	269
Other Assets | Not designed as hedging instrument
Derivative [Line Items]
Derivative Assets	46,155	51,029
Other Assets | Not designed as hedging instrument | Interest Rate Derivatives
Derivative [Line Items]
Derivative Assets	38,974	42,510
Other Assets | Not designed as hedging instrument | Interest Rate Lock Commitments
Derivative [Line Items]
Derivative Assets	4,265	7,401
Other Assets | Not designed as hedging instrument | Forward commitments to sell mortgage loans
Derivative [Line Items]
Derivative Assets	2,037	745
Other Assets | Not designed as hedging instrument | Foreign Exchange Contract
Derivative [Line Items]
Derivative Assets	879	373
Other Assets | Cash flow hedging | Designated as hedging instrument | Interest Rate Derivatives
Derivative [Line Items]
Derivative Assets	8,011	242
Other Assets | Fair value hedging | Designated as hedging instrument | Interest Rate Derivatives
Derivative [Line Items]
Derivative Assets	2,228	27
Other Liabilities
Derivative [Line Items]
Derivative liabilities	39,839	45,019
Other Liabilities | Designated as hedging instrument
Derivative [Line Items]
Derivative liabilities	0	989
Other Liabilities | Not designed as hedging instrument
Derivative [Line Items]
Derivative liabilities	39,839	44,030
Other Liabilities | Not designed as hedging instrument | Interest Rate Derivatives
Derivative [Line Items]
Derivative liabilities	37,665	41,469
Other Liabilities | Not designed as hedging instrument | Interest Rate Lock Commitments
Derivative [Line Items]
Derivative liabilities	1,325	171
Other Liabilities | Not designed as hedging instrument | Forward commitments to sell mortgage loans
Derivative [Line Items]
Derivative liabilities	0	2,275
Other Liabilities | Not designed as hedging instrument | Foreign Exchange Contract
Derivative [Line Items]
Derivative liabilities	849	115
Other Liabilities | Cash flow hedging | Designated as hedging instrument | Interest Rate Derivatives
Derivative [Line Items]
Derivative liabilities	0	846
Other Liabilities | Fair value hedging | Designated as hedging instrument | Interest Rate Derivatives
Derivative [Line Items]
Derivative liabilities	$ 0	$ 143