Columbia Bancorp's net loss widened more than threefold from the previous period to $23.3 million in the second quarter as its credit provision jumped almost 50%, to $14.4 million and it took a $7.2 million charge against deferred tax assets.

The $1.1 billion-asset banking company in The Dalles, Ore., said Monday that it continued to be hurt by construction and development loans in the central part of the state and the Portland-Vancouver metropolitan area.

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