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
	Mar. 31, 2014	Mar. 31, 2013
Sales and Redemptions of Available for Sale Securities:
Gross gains	$ 581	$ 248
Gross losses
Other-than-temporary impairment losses