Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Stock-based Compensation

Summary of changes in, the Company's stock option awards

	As of and for the Year Ended December 31, 2021
					Weighted-
			Weighted-		Average
			Average		Remaining
			Exercise		Contractual		Intrinsic
	Shares		Price		Life		Value
Outstanding at beginning of year		39,085	$	23.53		5.88	$	—
Exercised		—		—
Forfeited		—		—
Expired		(7,699)		23.53
Outstanding at end of year		31,386	$	23.53		4.88	$	113
Exercisable at end of year		31,386	$	23.53		4.88	$	113

Summary of changes in the Company's RSU, PSU, and DSU awards

	As of and for the Year Ended December 31, 2021
	RSU Awards				PSU Awards				DSU Awards
			Weighted-				Weighted-				Weighted-
			Average				Average				Average
			Grant Date				Grant Date				Grant Date
	Shares		Fair Value		Shares (1)		Fair Value		Shares		Fair Value
Nonvested at beginning of period		1,017,038	$	23.87		15,724	$	16.25		34,263	$	17.18
Granted		260,231		24.26		99,159		23.91		35,664		24.59
Dividend equivalents earned		43,783		23.65		—		—		4,891		23.72
Vested		(143,242)		23.50		—		—		(40,683)		18.24
Forfeited		(29,883)		24.88		(968)		23.48		—		—
Nonvested at end of period		1,147,927	$	23.97		113,915	$	22.86		34,135	$	24.59
Vested and outstanding at end of period										97,297	$	22.02

Schedule of Stock-based compensation expense

The Company recognized compensation expense related to non-vested RSU, PSU, and DSU awards, as well as the 2021 ESPP, as presented in the table below (dollars in thousands):

	Years Ended December 31,
	2021		2020		2019
Stock-based compensation expense
Stock options (1)	$	—	$	—	$	146
RSU awards		5,809		6,493		3,249
PSU awards		979		77		—
DSU awards		962		565		602
2021 ESPP		114		—		—
Total stock-based compensation expense	$	7,864	$	7,135	$	3,997

(1) Stock option compensation expense recorded in 2019 was attributable to converted options related to the 2017 acquisition of First Community.

Schedule of Unamortized stock-based compensation expense

Unamortized stock-based compensation expense is presented in the table below (dollars in thousands):

	As of December 31,
	2021			2020
Unamortized stock-based compensation
RSU awards	$	10,204		$	10,411
PSU awards		1,547			179
DSU awards		209			294
Total unamortized stock-based compensation	$	11,960		$	10,884
Weighted average period over which expense is to be recognized		2.9	yrs		3.0	yrs