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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]  
Calculation of Earnings Per Share
Information used to calculate earnings per share was as follows:
(In Thousands)
2017
2016
2015
Net income attributable to Northrim BanCorp, Inc.

$13,151


$14,411


$17,783

Basic weighted average common shares outstanding
6,890

6,884

6,859

Dilutive effect of potential common shares from awards granted under equity incentive program
88

91

89

Total
6,978

6,975

6,948

Earnings per common share
 
 
 
Basic

$1.91


$2.09


$2.59

Diluted

$1.88


$2.06


$2.56