Stock and Incentive Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Plan Activity

The following table summarizes Trustmark’s performance award activity for the periods presented:

	Years Ended December 31,
	2018					2017					2016
				Weighted-					Weighted-					Weighted-
				Average					Average					Average
				Grant-Date					Grant-Date					Grant-Date
	Shares			Fair Value		Shares			Fair Value		Shares			Fair Value
Nonvested shares, beginning of year		213,516		$	25.37		237,136		$	26.27		212,309		$	24.14
Granted		51,174			31.88		58,406			33.31		99,116			20.18
Released from restriction		(55,351	)		25.32		(67,279	)		34.78		(40,888	)		32.84
Forfeited		(31,644	)		26.26		(14,747	)		28.42		(33,401	)		30.01
Nonvested shares, end of year		177,695		$	27.10		213,516		$	25.37		237,136		$	26.27

The following table summarizes Trustmark’s time-vested award activity for the periods presented:

	Years Ended December 31,
	2018					2017					2016
				Weighted-					Weighted-					Weighted-
				Average					Average					Average
				Grant-Date					Grant-Date					Grant-Date
	Shares			Fair Value		Shares			Fair Value		Shares			Fair Value
Nonvested shares, beginning of year		320,357		$	25.40		322,056		$	22.65		306,657		$	24.56
Granted		118,325			31.96		105,524			33.79		139,791			20.66
Released from restriction		(107,180	)		23.02		(101,289	)		25.35		(108,241	)		23.74
Forfeited		(9,632	)		29.30		(5,934	)		26.52		(16,151	)		22.24
Nonvested shares, end of year		321,870		$	28.48		320,357		$	25.40		322,056		$	22.65

Compensation Expense for Awards Under Stock Plan

The following table presents information regarding compensation expense for awards under the Stock Plan for the periods presented ($ in thousands):

							At December 31, 2018
	Recognized Compensation Expense						Unrecognized		Weighted Average
	for Years Ended December 31,						Compensation		Life ofUnrecognized
	2018		2017		2016		Expense		Compensation Expense
Performance awards	$	861	$	1,387	$	1,171	$	1,624		1.64
Time-vested awards		3,009		2,922		2,513		3,548		1.79
Total	$	3,870	$	4,309	$	3,684	$	5,172