Investment Securities (Visa Class B Restricted Shares Narrative) (Details 8) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) shares	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) shares	Sep. 30, 2014 USD ($)
Net Investment Income [Line Items]
Net Gain on Sale of Investment Securities | $	$ 24	$ 1,858	$ 10,341	$ 6,097
Visa Class B Restricted Securities
Net Investment Income [Line Items]
Conversion Ratio to Class A shares	1.6483		1.6483
Net Gain on Sale of Investment Securities | $			$ 10,100
Sale of investment securities, shares			95,000
Equity securities remaining, shares	288,714		288,714
Donation of Investment Securities, Shares			13,800
Visa Class A Unrestricted Securities
Net Investment Income [Line Items]
Equity securities remaining, shares	475,887		475,887