Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Reconciliation of Numerator and Denominator of Basic Earnings Per Share with that of Diluted Earnings Per Share

The reconciliation of the numerator and denominator of basic earnings per share with that of diluted earnings per share is presented as follows:

	Year Ended December 31
(Dollars in thousands, except per share)	2013		2012		2011
Distributed earnings allocated to common stock	$	62,982	$	62,286	$	56,827
Undistributed earnings allocated to common stock		22,512		20,245		18,783
Net earnings allocated to common shareholders	$	85,494	$	82,531	$	75,610
Average common shares outstanding		50,353,452		50,265,620		46,803,432
Equivalents from stock options		72,626		32,399		33,931
Average diluted shares outstanding		50,426,078		50,298,019		46,837,363
Earnings per basic common share	$	1.70	$	1.64	$	1.62
Earnings per diluted common share	$	1.70	$	1.64	$	1.61