Derivative Financial Instruments (Summary Amounts Included in Consolidated Statement of Income Related to Derivatives) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Interest Rate Swaps And Caps [Member] | Trading Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Income related to derivative instruments not designated in hedge relationships	$ (1,675)	$ 853
Mortgage Banking Derivatives [Member] | Mortgage Banking Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Income related to derivative instruments not designated in hedge relationships	(2,012)	6,026
Call Options Written [Member] | Fees From Covered Call Options [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Income related to derivative instruments not designated in hedge relationships	7,859	4,773
Foreign Exchange Contract [Member] | Trading Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Income related to derivative instruments not designated in hedge relationships	$ 68	$ (11)