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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, 2016 |  | 6,898,000 |  |  |  |
Beginning 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) |  |  |
Treasury stock buy-back (in shares) |  | (58,000) |  |  |  |
Treasury stock buy-back | (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 assets 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 | Accounting Standards Update 2017-08 | (62) |  |  | (62) |  |
Cumulative effect of new accounting principle | Accounting Standards Update 2016-01 | 0 |  |  | 191 | (191) |
Cash dividend declared | (1,664) |  |  | (1,664) |  |
Stock-based compensation expense | 253 |  | 253 |  |  |
Other comprehensive income (loss), net of tax | (418) |  |  |  | (418) |
Net income attributable to the noncontrolling interest | 0 |  |  |  |  |
Net income attributable to Northrim BanCorp, Inc. | $ 4,062 |  |  | 4,062 |  |
Ending balance (in shares) at Mar. 31, 2018 | 6,871,963 | 6,872,000 |  |  |  |
Ending balance, value at Mar. 31, 2018 | $ 194,973 | $ 6,872 | $ 62,046 | 126,934 | $ (879) | $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative effect of new accounting principle | Accounting Standards Update 2017-08 |  |  |  | $ (62) |  |

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