Investment Securities - Gross Gains and Losses on Sales and Redemptions of Available for Sale Securities and Other Than Temporary Impairment Losses Recognized (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Sales and Redemptions of Available for Sale Securities:
Gross gains	$ 909	$ 0	$ 2,335	$ 487
Gross losses
Other-than-temporary impairment losses