Kroll Bond Rating Agency affirmed Western Alliance Bancorp.'s A- senior unsecured debt rating, BBB+ subordinated debt rating and K2 short-term debt rating.

The agency also affirmed Western Alliance unit Western Alliance Bank's deposit and senior unsecured debt ratings of A, subordinated debt rating of A- and short-term deposit and debt ratings of K1.

The outlook for all long-term ratings is stable.

The ratings are based on the company's solid financial profile, with consistent and above-peer returns in recent years, according to Kroll.