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Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Non-controlling Interest
--- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2015 |  | 6,877,000 |  |  |  |
Beginning balance, value at Dec. 31, 2015 | $ 177,214 | $ 6,877 | $ 62,420 | $ 108,150 | $ (412) | $ 179
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cash dividend declared | (5,420) |  |  | (5,420) |  |
Stock-based compensation expense | 778 |  | 778 |  |  |
Exercise of stock options and vesting of restricted stock units, net (in shares) |  | 21,000 |  |  |  |
Exercise of stock options and vesting of restricted stock units, net | $ (162) | $ 21 | (183) |  |  |
Repurchase of common stock (in shares) | 0 |  |  |  |  |
Excess tax benefits from share-based payment arrangements | $ (63) |  | (63) |  |  |
Distributions to noncontrolling interest | (640) |  |  |  |  | (640)
Other comprehensive income (loss), net of tax | 15 |  |  |  | 15 |
Net income attributable to the noncontrolling interest | 579 |  |  |  |  | 579
Net income attributable to Northrim BanCorp, Inc. | 14,411 |  |  | 14,411 |  |
Ending balance (in shares) at Dec. 31, 2016 |  | 6,898,000 |  |  |  |
Ending balance, value at Dec. 31, 2016 | 186,712 | $ 6,898 | 62,952 | 117,141 | (397) | 118
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cash dividend declared | (5,970) |  |  | (5,970) |  |
Stock-based compensation expense | 665 |  | 665 |  |  |
Exercise of stock options and vesting of restricted stock units, net (in shares) |  | 32,000 |  |  |  |
Exercise of stock options and vesting of restricted stock units, net | $ (243) | $ 32 | (275) |  |  |
Repurchase of common stock (in shares) | (58,341) | (58,000) |  |  |  |
Repurchase of common stock | $ (1,607) | $ (58) | (1,549) |  |  |
Distributions to noncontrolling interest | (445) |  |  |  |  | (445)
Other comprehensive income (loss), net of tax | 212 |  |  |  | 212 |
Reclassification for remeasuring of deferred tax asset related to investment securities | 0 |  |  | 85 | (85) |
Net income attributable to the noncontrolling interest | 327 |  |  |  |  | 327
Net income attributable to Northrim BanCorp, Inc. | $ 13,151 |  |  | 13,151 |  |
Ending balance (in shares) at Dec. 31, 2017 | 6,871,963 | 6,872,000 |  |  |  |
Ending balance, value at Dec. 31, 2017 | $ 192,802 | $ 6,872 | 61,793 | 124,407 | (270) | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2016-01 |  |  |  | 191 | (191) |
Net income attributable to Northrim BanCorp, Inc. | $ 4,062 |  |  |  |  |
Beginning balance (in shares) at Dec. 31, 2017 | 6,871,963 | 6,872,000 |  |  |  |
Beginning balance, value at Dec. 31, 2017 | $ 192,802 | $ 6,872 | 61,793 | 124,407 | (270) | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cash dividend declared | (7,088) |  |  | (7,088) |  |
Stock-based compensation expense | 816 |  | 816 |  |  |
Exercise of stock options and vesting of restricted stock units, net (in shares) |  | 27,000 |  |  |  |
Exercise of stock options and vesting of restricted stock units, net | $ 28 | $ 27 | 1 |  |  |
Repurchase of common stock (in shares) | (15,468) | (16,000) |  |  |  |
Repurchase of common stock | $ (494) | $ (16) | (478) |  |  |
Other comprehensive income (loss), net of tax | (59) |  |  |  | (59) |
Net income attributable to the noncontrolling interest | 0 |  |  |  |  |
Net income attributable to Northrim BanCorp, Inc. | $ 20,004 |  |  | 20,004 |  |
Ending balance (in shares) at Dec. 31, 2018 | 6,883,216 | 6,883,000 |  |  |  |
Ending balance, value at Dec. 31, 2018 | $ 205,947 | $ 6,883 | $ 62,132 | 137,452 | $ (520) | $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption | Accounting Standards Update 2017-08 |  |  |  | $ (62) |  |

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