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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
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)
2018
2017
2016
Net income attributable to Northrim BanCorp, Inc.

$20,004


$13,151


$14,411

Basic weighted average common shares outstanding
6,878

6,890

6,884

Dilutive effect of potential common shares from awards granted under equity incentive program
104

88

91

Total
6,982

6,978

6,975

Earnings per common share
 
 
 
Basic

$2.91


$1.91


$2.09

Diluted

$2.86


$1.88


$2.06