Loans and Allowance - Additional Information (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended	9 Months Ended
	Sep. 30, 2013 Real estate loans - Residential	Dec. 31, 2012 Real estate loans - Residential	Sep. 30, 2013 Real estate loans - Commercial and farm land loan	Sep. 30, 2013 Real estate loans - Commercial and farm land loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential real estate loans held for sale	$ 5,312	$ 22,300
Percentage of troubled debt restructured loans			67.00%	40.00%
Number of troubled debt restructured loans			5	12