What's at stake: Heritage Financial's $176.6 million deal to acquire Olympic Bancorp will create an$8.8 billion-asset community bank.Key insight: After completing its last bank acquisition in July 2018, Heritage spent seven years on the M&A sidelines.Forward look: Heritage is predicting an 18% earnings accretion in 2027, after costs savings totaling 35% of Olympic's operating expense base are fully phased in.In a deal that expands its footprint in the Puget Sound region, Heritage Financial Corp. in Olympia ...