Investment Securities (Sale of Securities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of investment securities	$ 177,826	$ 212,609	$ 290,491
Gains on sales of investments securities available-for-sale	2,953	4,501	7,400
Losses on sales of investment securities available-for-sale	(181)	(380)	(102)
Total securities gains	$ 2,772	$ 4,121	$ 7,298