Looking at the universe of stocks we cover at Dividend Channel, on 8/7/17, Columbia Banking System Inc (COLB - Get Report), Sandy Spring Bancorp Inc (SASR), and Northfield Bancorp Inc (NFBK) will all trade ex-dividend for their respective upcoming dividends. Columbia Banking System Inc will pay its quarterly dividend of $0.22 on 8/23/17, Sandy Spring Bancorp Inc will pay its quarterly dividend of $0.26 on 8/16/17, and Northfield Bancorp Inc will pay its quarterly dividend of $0.08 on 8/23/17.

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As a percentage of COLB's recent stock price of $39.33, this dividend works out to approximately 0.56%, so look for shares of Columbia Banking System Inc to trade 0.56% lower — all else being equal — when COLB shares open for trading on 8/7/17. Similarly, investors should look for SASR to open 0.66% lower in price and for NFBK to open 0.47% lower, all else being equal.

Below are dividend history charts for COLB, SASR, and NFBK, showing historical dividends prior to the most recent ones declared.

Columbia Banking System Inc (COLB - Get Report):

COLB+Dividend+History+Chart

Sandy Spring Bancorp Inc (SASR):

SASR+Dividend+History+Chart

Northfield Bancorp Inc (NFBK):

NFBK+Dividend+History+Chart

In general, dividends are not always predictable, following the ups and downs of company profits over time. Therefore, a good first due diligence step in forming an expectation of annual yield going forward, is looking at the history above, for a sense of stability over time. This can help in judging whether the most recent dividends from these companies are likely to continue. If they do continue, the current estimated yields on annualized basis would be 2.24% for Columbia Banking System Inc, 2.63% for Sandy Spring Bancorp Inc, and 1.90% for Northfield Bancorp Inc .

In Thursday trading, Columbia Banking System Inc shares are currently off about 0.2%, Sandy Spring Bancorp Inc shares are down about 0.3%, and Northfield Bancorp Inc shares are off about 0.1% on the day.