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Segment Information - Schedule of Segment Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) segment bank | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |
Number of segments | segment | 2 |  |
Interest income | $ 14,795 | $ 14,465 |
Interest expense | 532 | 632 |
Net Interest Income | 14,263 | 13,833 |
Provision for loan losses | 0 | 400 |
Other operating income | 7,462 | 8,905 |
Compensation expense - RML acquisition payments | 0 | 174 |
Other operating expense | 16,795 | 16,441 |
Income Before Provision for Income Taxes | 4,930 | 5,723 |
Provision for income taxes | 868 | 1,801 |
Net Income | 4,062 | 3,922 |
Less: Net income attributable to the noncontrolling interest | 0 | 97 | $ 327
Net Income Attributable to Northrim BanCorp, Inc. | 4,062 | 3,825 | 13,151
Total assets | 1,524,741 |  | 1,518,596
Loans held for sale | $ 41,216 |  | 43,979
Community Banking |  |  |
Segment Reporting Information [Line Items] |  |  |
Number of branches | bank | 14 |  |
Interest income | $ 14,463 | 14,115 |
Interest expense | 427 | 566 |
Net Interest Income | 14,036 | 13,549 |
Provision for loan losses | 0 | 400 |
Other operating income | 2,518 | 3,455 |
Compensation expense - RML acquisition payments | 0 | 174 |
Other operating expense | 12,394 | 11,622 |
Income Before Provision for Income Taxes | 4,160 | 4,808 |
Provision for income taxes | 659 | 1,422 |
Net Income |  | 3,386 |
Less: Net income attributable to the noncontrolling interest |  | 97 |
Net Income Attributable to Northrim BanCorp, Inc. | 3,501 | 3,289 |
Total assets | 1,460,720 |  | 1,452,602
Loans held for sale | 0 |  | 0
Home Mortgage Lending |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 332 | 350 |
Interest expense | 105 | 66 |
Net Interest Income | 227 | 284 |
Provision for loan losses | 0 | 0 |
Other operating income | 4,944 | 5,450 |
Compensation expense - RML acquisition payments | 0 | 0 |
Other operating expense | 4,401 | 4,819 |
Income Before Provision for Income Taxes | 770 | 915 |
Provision for income taxes | 209 | 379 |
Net Income |  | 536 |
Less: Net income attributable to the noncontrolling interest |  | 0 |
Net Income Attributable to Northrim BanCorp, Inc. | 561 | $ 536 |
Total assets | 64,021 |  | 65,994
Loans held for sale | $ 41,216 |  | $ 43,979

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