Retirement and Share-based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-based Compensation Expense By Plan

The following table summarizes compensation expense recognized for employees, directors and consultants as a result of share-based compensation:

	Year Ended December 31,
	2015		2014		2013
	(Dollars in thousands)
ESOP	$	2,604	$	2,486	$	3,464
2009 Employee Incentive Plan	1,911		1,306		1,294
2013 Director Equity and Incentive Plan	564		603		380
2011 Director Stock Option Plan	49		186		304
	$	5,128	$	4,581	$	5,442

Valuation Assumptions of Stock Options Granted

The fair value for each stock option granted to agents during the year ended December 31, 2013 was estimated using a Black-Scholes option valuation model until the grant date, at which time the options are included as permanent equity, with the following assumptions:

	Year Ended December 31,
	2013
Average risk-free interest rate	1.21	%
Dividend yield	0.7	%
Average expected life (years)	3.75
Volatility	31.2	%

Schedule of Stock Options Outstanding

Changes in the number of stock options outstanding during the years ended December 31, 2015, 2014 and 2013 are as follows:

	Number of Shares		Weighted-Average Exercise Price per Share		Total Exercise Price
	(Dollars in thousands, except per share data)
Outstanding at January 1, 2013	5,732,450		$	10.35	$	59,321
Granted	1,210,950		13.13		15,899
Canceled	(29,400	)	9.96		(293		)
Exercised	(2,937,275	)	10.81		(31,756		)
Outstanding at December 31, 2013	3,976,725		10.86		43,171
Granted	1,277,650		24.79		31,673
Canceled	(35,400	)	11.64		(412		)
Exercised	(1,174,800	)	11.64		(13,672		)
Outstanding at December 31, 2014	4,044,175		15.02		60,760
Granted	—		—		—
Canceled	(47,300	)	10.54		(499		)
Exercised	(552,884	)	14.51		(8,021		)
Outstanding at December 31, 2015	3,443,991		15.17		$	52,240

Schedule of Stock Options Outstanding, By Exercise Price Range

The following table summarizes information about stock options outstanding at December 31, 2015:

	Stock Options Outstanding				Stock Options Vested
Range of Exercise Prices	Number of Awards	Remaining Life (yrs)	Weighted-Average Exercise Price Per Share		Number of Awards	Remaining Life (yrs)	Weighted-Average Exercise Price Per Share
$5.07 - $8.02	383,500	2.19	$	7.33	383,500	2.19	$	7.33
$9.27 - $11.35	1,051,525	3.06	10.23		1,051,525	3.06	10.23
$11.87 - $24.79	2,008,966	4.25	19.25		2,008,966	4.25	19.25
$5.07 - $24.79	3,443,991	3.66	15.17		3,443,991	3.66	15.17