Key Takeaways COLB stock rose 32.6% in six months, outpacing peers after strong Q3 results and a major acquisition.The Pacific Premier deal boosted NIM, with Q4 and Q1 NIM guided to stay just above 3.90%.COLB targets $127M in annual cost savings, with $48M already realized and more synergies ahead.Columbia Banking (COLB) stock has risen 32.6% in the past six months on the back of robust quarterly performance, the Pacific Premier acquisition (completed in August) and favorable changes to the operating backdr ...