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Equity Incentive Plan (Tables)
3 Months Ended
Mar. 31, 2015
Employee Stock Ownership Plan (ESOP), Shares in ESOP [Abstract]  
Summary of the Company's Service Condition Nonvested Shares
A summary of the Company’s nonvested share awards with service conditions as of March 31, 2015 is as follows:
 
Number of
Shares
 
Weighted -
Average Grant
Date Fair Value
Nonvested at January 1, 2015
256,379

 
$
31.00

Granted
62,742

 
38.84

Vested
(73,234
)
 
28.74

Forfeited
(12,736
)
 
27.31

Nonvested at March 31, 2015 (1)
233,151

 
$
34.02

(1) 
Amount excludes 84,401 share awards with market conditions which were earned but nonvested due to a service condition as of March 31, 2015.
Summary of the Company's Long-Term Performance-Based Share Awards
A summary of the Company’s nonvested share awards with either market or performance conditions as of March 31, 2015 is as follows:
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair Value
Nonvested at January 1, 2015
311,625

 
$
33.62

Granted (1)(2)
90,616

 
37.80

Vested
(53,654
)
 
35.99

Forfeited
0

 
0.00

Nonvested at March 31, 2015
348,587

 
$
34.35

(1) 
Amount includes 30,831 shares awarded on March 19, 2015 for which fair value has been estimated, but amortization into expense has not yet commenced. Amortization of fair value into expense will commence at the beginning of the performance measurement period on July 1, 2015.
(2) 
Amount includes an additional 28,956 shares issued on January 1, 2015 from the January 26, 2012 grant, which were earned in excess of the target amount.