Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2016
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,
 
2016
 
2015
 
2014
 
(In thousands)
ESOP contribution expense
$
1,605

 
$
1,400

 
$
1,216

Dividends on unallocated ESOP shares used to reduce ESOP contribution
183

 
210

 
197


Shares held by the ESOP at December 31, 2016 and 2015, are as follows: 
 
December 31,
 
2016
 
2015
 
(Dollars in thousands, except share data)
Allocated shares
1,043,893

 
931,040

Unallocated shares
648,907

 
761,760

Total ESOP shares
1,692,800

 
1,692,800

Fair value of unallocated shares
$
12,809

 
$
10,634

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. There were no stock options granted in 2016.
 
Year Ended December 31,
 
2016
 
2015
 
2014
Annual dividend yield
N/A
 
1.77
%
 
1.86
%
Expected volatility
N/A
 
35.30

 
37.27

Risk-free interest rate
N/A
 
2.23

 
2.44

Expected term
N/A
 
10.0 years

 
10.0 years

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

 
$
4.13

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, 2016 follows: 
 
Shares
 
Weighted-
Average
Exercise Price
 
Weighted-
Average
Remaining
Contractual
Term in Years
 
Aggregate
Intrinsic Value
Outstanding at December 31, 2015
884,260

 
$
10.11

 
 
 


Granted

 

 

 
 
Exercised
(260,440
)
 
9.78

 
 
 


Forfeited or expired
(20,000
)
 
12.05

 
 
 
 
Outstanding at December 31, 2016
603,820

 
10.19

 
4.84
 
$
5,766,947

Expected to vest assuming a 3% forfeiture rate over the vesting term
598,750

 
10.18

 
4.82
 
5,723,540

Exercisable at December 31, 2016
434,820

 
9.80

 
3.80
 
4,320,027

Schedule of Nonvested Restricted Stock Units Activity
A summary of changes in nonvested restricted stock awards for the year ended December 31, 2016, follows: 
Nonvested Shares
 
Shares
 
Weighted-Average Grant Date  Fair Value
Nonvested at December 31, 2015
 
47,800

 
$
8.95

Granted
 
14,052

 
12.81

Vested
 
(35,452
)
 
10.34

Nonvested at December 31, 2016
 
26,400

 
9.13

 
 
 
 
 
Expected to vest assuming a 3% forfeiture rate over the vesting term
 
25,608

 
 

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:
 
2016
 
2015
Source
Valuation Report
 
Valuation Report
First Financial Northwest’s Plan(1)
103.7
%
 
102.8
%
_________________ 
(1) Market value of plan assets reflects any contributions received through June 30, 2016, or 2015, respectively.
Schedule of Net Benefit Costs
Total contributions during the years ended December 31, 2016, 2015, and 2014 were: 
2016
 
2015
 
2014
Date Paid
 
Amount
 
Date Paid
 
Amount
 
Date Paid
 
Amount
 
10/7/2016
 
$
40,129

 
11/25/2015
 
$
540,000

 
9/25/2014
 
$
8,735

11/23/2016
 
499,871

 
 
 


 
11/28/2014
 
539,932

Total
 
$
540,000

 
Total
 
$
540,000

 
Total
 
$
548,667