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Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total interest income | $ 17,207 | $ 16,580 | $ 15,595 | $ 14,795 | $ 15,232 | $ 15,519 | $ 14,892 | $ 14,465 | $ 64,177 | $ 60,108 | $ 58,918
Interest expense | 1,070 | 761 | 606 | 532 | 548 | 602 | 648 | 632 | 2,969 | 2,430 | 2,561
Net Interest Income | 16,137 | 15,819 | 14,989 | 14,263 | 14,684 | 14,917 | 14,244 | 13,833 | 61,208 | 57,678 | 56,357
Provision (benefit) for loan losses | (200) | 0 | (300) | 0 | 0 | 2,500 | 300 | 400 | (500) | 3,200 | 2,298
Total Other Operating Income | 7,718 | 8,673 | 8,314 | 7,462 | 7,952 | 13,855 | 9,762 | 8,905 | 32,167 | 40,474 | 43,263
Compensation expense - RML acquisition payments |  |  |  |  | (193) | 149 | 0 | 174 | 0 | 130 | 4,775
Other operating expense | 18,300 | 18,099 | 16,606 | 16,795 | 18,530 | 17,542 | 18,510 | 16,441 | 69,800 | 71,023 | 71,505
Income Before Provision for Income Taxes | 5,755 | 6,393 | 6,997 | 4,930 | 4,299 | 8,581 | 5,196 | 5,723 | 24,075 | 23,799 | 21,042
Provision for income taxes | 907 | 1,129 | 1,167 | 868 | 4,085 | 2,980 | 1,455 | 1,801 | 4,071 | 10,321 | 6,052
Net Income |  |  |  |  | 214 | 5,601 | 3,741 | 3,922 | 20,004 | 13,478 | 14,990
Less: Net income attributable to the noncontrolling interest |  |  |  |  | 0 | 78 | 152 | 97 | 0 | 327 | 579
Net Income Attributable to Northrim BanCorp, Inc. | 4,848 | $ 5,264 | $ 5,830 | $ 4,062 | 214 | $ 5,523 | $ 3,589 | $ 3,825 | 20,004 | 13,151 | 14,411
Total assets | 1,502,988 |  |  |  | 1,518,596 |  |  |  | 1,502,988 | 1,518,596 | 1,525,851
Loans held for sale | 34,710 |  |  |  | 43,979 |  |  |  | 34,710 | 43,979 | 43,849
Community Banking |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total interest income |  |  |  |  |  |  |  |  | 62,097 | 58,308 | 56,986
Interest expense |  |  |  |  |  |  |  |  | 2,370 | 1,860 | 1,739
Net Interest Income |  |  |  |  |  |  |  |  | 59,727 | 56,448 | 55,247
Provision (benefit) for loan losses |  |  |  |  |  |  |  |  | (500) | 3,200 | 2,298
Total Other Operating Income |  |  |  |  |  |  |  |  | 11,323 | 17,187 | 13,756
Compensation expense - RML acquisition payments |  |  |  |  |  |  |  |  |  | 130 | 4,775
Other operating expense |  |  |  |  |  |  |  |  | 49,956 | 50,271 | 48,610
Income Before Provision for Income Taxes |  |  |  |  |  |  |  |  | 21,594 | 20,034 | 13,320
Provision for income taxes |  |  |  |  |  |  |  |  | 3,361 | 9,499 | 2,867
Net Income |  |  |  |  |  |  |  |  | 18,233 | 10,535 | 10,453
Less: Net income attributable to the noncontrolling interest |  |  |  |  |  |  |  |  |  | 327 | 579
Net Income Attributable to Northrim BanCorp, Inc. |  |  |  |  |  |  |  |  |  | 10,208 | 9,874
Total assets | 1,443,745 |  |  |  | 1,452,602 |  |  |  | 1,443,745 | 1,452,602 | 1,459,261
Loans held for sale | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Home Mortgage Lending |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total interest income |  |  |  |  |  |  |  |  | 2,080 | 1,800 | 1,932
Interest expense |  |  |  |  |  |  |  |  | 599 | 570 | 822
Net Interest Income |  |  |  |  |  |  |  |  | 1,481 | 1,230 | 1,110
Provision (benefit) for loan losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total Other Operating Income |  |  |  |  |  |  |  |  | 20,844 | 23,287 | 29,507
Compensation expense - RML acquisition payments |  |  |  |  |  |  |  |  |  | 0 | 0
Other operating expense |  |  |  |  |  |  |  |  | 19,844 | 20,752 | 22,895
Income Before Provision for Income Taxes |  |  |  |  |  |  |  |  | 2,481 | 3,765 | 7,722
Provision for income taxes |  |  |  |  |  |  |  |  | 710 | 822 | 3,185
Net Income |  |  |  |  |  |  |  |  | 1,771 | 2,943 | 4,537
Less: Net income attributable to the noncontrolling interest |  |  |  |  |  |  |  |  |  | 0 | 0
Net Income Attributable to Northrim BanCorp, Inc. |  |  |  |  |  |  |  |  |  | 2,943 | 4,537
Total assets | 59,243 |  |  |  | 65,994 |  |  |  | 59,243 | 65,994 | 66,590
Loans held for sale | $ 34,710 |  |  |  | $ 43,979 |  |  |  | $ 34,710 | $ 43,979 | $ 43,849

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