Derivative Financial Instruments (Summary Amounts Included in Consolidated Statement of Income Related to Derivatives) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Interest rate swaps and caps | Trading Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Income related to derivative instruments not designated in hedge relationships	$ 279	$ (454)
Mortgage Banking Derivatives | Mortgage Banking Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Income related to derivative instruments not designated in hedge relationships	(9,537)	(299)
Call Options Written | Fees From Covered Call Options
Derivative Instruments, Gain (Loss) [Line Items]
Income related to derivative instruments not designated in hedge relationships	11,470	15,364
Foreign Exchange Contract | Trading Revenue
Derivative Instruments, Gain (Loss) [Line Items]
Income related to derivative instruments not designated in hedge relationships	$ (234)	$ 186