Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

Amounts used in the determination of basic and diluted earnings per share for the years ended December 31, 2012, 2011 and 2010, are shown in the table below:

(Dollars and number of shares in thousands, except per share data)	2012			2011			2010
Net income attributable to Heartland	$	49,792		$	28,044		$	23,903
Preferred dividends and discount	(3,400		)	(7,640		)	(5,344		)
Net income available to common stockholders	$	46,392		$	20,404		$	18,559
Weighted average common shares outstanding for basic earnings per share	16,518			16,437			16,372
Assumed incremental common shares issued upon exercise of stock options	251			139			90
Weighted average common shares for diluted earnings per share	16,769			16,576			16,462
Earnings per common share — basic	$	2.81		$	1.24		$	1.13
Earnings per common share — diluted	$	2.77		$	1.23		$	1.13
Number of antidilutive stock options excluded from diluted earnings per share computation	106			514			562