Loans and Allowance - Additional Information (Details) (USD $)					3 Months Ended
	Feb. 10, 2012 SCB Bank	Nov. 12, 2013 Merger with CFS Bancorp, Inc. (Citizens)	Mar. 31, 2014 Real estate loans - Residential	Dec. 31, 2013 Real estate loans - Residential	Mar. 31, 2014 Real estate loans - Commercial and farm land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential real estate loans held for sale			$ 6,586,000	$ 5,331,000
Loan Acquired during acquisition	113,000,000	639,600,000
Fair Value Discount	$ 19,200,000	$ 36,500,000
Percentage of troubled debt restructured loans					90.00%