Proceeds from the Sales of Securities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Investments [Line Items]
Proceeds from Sales of Securities Available-for-Sale	$ 92,344	$ 20,061	$ 0
Net Gains on Securities	1,667	3,024	0
Available-For-Sale Securities [Member]
Schedule of Investments [Line Items]
Proceeds from Sales of Securities Available-for-Sale	92,344	20,061	0
Net Gains on Securities	1,667	2,089	0
Income Tax Gross Gains	$ 583	$ 721	$ 0