Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2015
Multiemployer Plans [Line Items]  
Schedule of Employee Stock Ownership Plan (ESOP) Disclosures
A summary of key transactions for the ESOP for the periods indicated follows:
 
Year Ended December 31,
 
2015
 
2014
 
2013
 
(In thousands)
ESOP contribution expense
$
1,400

 
$
1,216

 
$
1,087

Dividends on unallocated ESOP shares used to reduce ESOP contribution
210

 
197

 
132


Shares held by the ESOP at December 31, 2015, and 2014, are as follows: 
 
December 31,
 
2015
 
2014
 
(Dollars in thousands, except share data)
Allocated shares
931,040

 
818,187

Unallocated shares
761,760

 
874,613

Total ESOP shares
1,692,800

 
1,692,800

Fair value of unallocated shares
$
10,634

 
$
10,530

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The fair value of options granted was determined using the following weighted-average assumptions as of the grant date for the periods indicated. 
 
Year Ended December 31,
 
2015
 
2014
 
2013
Annual dividend yield
1.77
%
 
1.86
%
 
1.35
%
Expected volatility
35.30

 
37.27

 
34.05

Risk-free interest rate
2.23

 
2.44

 
2.18

Expected term
10.0 years

 
10.0 years

 
8.1 years

Weighted-average grant date fair value per option granted
$
4.74

 
$
4.13

 
$
3.70

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
A summary of the Company’s stock option plan awards activity for the year ended December 31, 2015 follows: 
 
Shares
 
Weighted-
Average
Exercise Price
 
Weighted-
Average
Remaining
Contractual
Term in Years
 
Aggregate
Intrinsic Value
Outstanding at December 31, 2014
929,260

 
$
9.51

 

 
$

Granted
80,000

 
12.98

 

 

Exercised
(125,000
)
 
7.48

 

 

Outstanding at December 31, 2015
884,260

 
10.11

 
4.93

 
3,403,707

Expected to vest assuming a 3% forfeiture rate over the vesting term
876,400

 
10.10

 
4.90

 
3,380,786

Exercisable at December 31, 2015
622,260

 
9.72

 
3.46

 
2,639,687

Schedule of Nonvested Restricted Stock Units Activity
A summary of changes in nonvested restricted stock awards for the period ended December 31, 2015, follows: 
Nonvested Shares
 
Shares
 
Weighted-Average Grant Date  Fair Value
Nonvested at December 31, 2012
 
244,847

 
$
8.95

Granted
 
25,000

 
10.88

Vested
 
(156,047
)
 
9.72

Forfeited
 
(10,400
)
 
9.12

Nonvested at December 31, 2013
 
103,400

 
8.24

Vested
 
(27,800
)
 
7.64

Nonvested at December 31, 2014
 
75,600

 
8.47

Vested
 
(27,800
)
 
7.64

Nonvested at December 31, 2015
 
47,800

 
8.95

 
 
 
 
 
Expected to vest assuming a 3% forfeiture rate over the vesting term
 
46,366

 
 

Multiemployer Plans, Pension  
Multiemployer Plans [Line Items]  
Schedule of Funded Status
The table below presents the funded status (market value of plan assets divided by funding target) of the plan as of July1:
 
2015
 
2014
Source
Valuation Report
 
Valuation Report
First Financial Northwest's Plan(1)
102.8
%
 
105.3
%
_________________ 
(1) Market value of plan assets reflects any contributions received through June 30, 2015, or 2014, respectively.
Schedule of Net Benefit Costs
Total contributions during the years ended December 31, 2015, 2014, and 2013 were: 
2015
 
2014
 
2013
Date Paid
 
Amount
 
Date Paid
 
Amount
 
Date Paid
 
Amount
 
11/2015
 
$
540,000

 
9/25/2014
 
$
8,735

 
9/18/2013
 
$
26,328

 
 


 
11/28/2014
 
539,932

 
12/5/2013
 
43,979

 
 

 
 
 

 
12/20/2013
 
159,080

Total
 
$
540,000

 
Total
 
$
548,667

 
Total
 
$
229,387