Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016, 2015 and 2014, are shown in the table below:

(Dollars and number of shares in thousands, except per share data)	2016			2015			2014
Net income attributable to Heartland	$	80,349		$	60,042		$	41,900
Preferred dividends	(292		)	(817		)	(817		)
Interest expense on convertible preferred debt	51			—			—
Net income available to common stockholders	$	80,108		$	59,225		$	41,083
Weighted average common shares outstanding for basic earnings per share	24,573			20,672			18,462
Assumed incremental common shares issued upon exercise of stock options and non-vested restricted stock units	300			257			280
Weighted average common shares for diluted earnings per share	24,873			20,929			18,742
Earnings per common share — basic	$	3.26		$	2.87		$	2.23
Earnings per common share — diluted	$	3.22		$	2.83		$	2.19
Number of antidilutive stock options excluded from diluted earnings per share computation	—			—			88