Significant Accounting Policies (Business Combinations) (Details) (USD $)			0 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 07, 2012 Independent Bank [Member] Branches	Apr. 30, 2010 OAK [Member]
Business Acquisition [Line Items]
Number of branches acquired (branches)			21
Deposits acquired			$ 404,000,000
Loans acquired			44,000,000
Acquisition purchase price			8,100,000	83,700,000
Premium paid on deposits purchased			11,500,000
Premium paid as a percent of deposits purchased (percent)			2.85%
Discount on loans purchased (percent)			1.75%
Goodwill acquired	120,164,000	113,414,000	6,800,000	43,500,000
Intangibles acquired			5,600,000	9,800,000
Total consideration paid for OAK acquisition				$ 83,700,000