XML 43 R28.htm IDEA: XBRL DOCUMENT
v3.19.1

Common Stock | 12 Months Ended
--- | ---
Dec. 31, 2018
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |
Common Stock | Common Stock Quarterly cash dividends were paid aggregating to $7.1 million, $6.0 million, and $5.4 million, or $1.02 per share, $0.86 per share, and $0.78 per share, in 2018, 2017, and 2016, respectively. On February 28, 2019, the Board of Directors declared a $0.30 per share cash dividend payable on March 22, 2019, to shareholders of record on March 14, 2019. Federal and State regulations place certain limitations on the payment of dividends by the Company. In September 2002, the Company’s Board of Directors approved a plan whereby it would periodically repurchase for cash up to approximately 5% of its shares of common stock in the open market. At December, 31, 2018, there are 153,433 shares available under the stock repurchase program. The Company intends to continue to repurchase its stock from time to time depending upon market conditions. The Company can make no assurances that it will continue this program or that it will repurchase all of the authorized shares. During 2018 and 2017, 15,468 and 58,341 shares were repurchased, respectively. There were no repurchases in 2016.

X
- Definition Common stock. + References No definition available. + Details
Name: | nrim_CommonStockTextBlock
Namespace Prefix: | nrim_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommonStockNumberOfSharesParValueAndOtherDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration