Disclosures About Fair Value of Assets and Liabilities - Estimated fair values (Details 2) (Nonrecurring, Significant Unobservable Inputs (Level 3), Market comparable properties, USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Collateral-dependent impaired loans	$ 4,275	$ 527
Weighted Average
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Marketability discount, range (weighted average)	10.00%	10.00%