Clydesdale Bank owner CYBG, which also runs Yorkshire Bank, said today it was hit by one-off restructuring costs in the first half of the year, knocking its profit.
The bank's statutory profit fell to £46m once one-off costs and charges were included, compared to £58m a year ago.
But it said that cost controls and new investments meant it would still meet full-year targets.
While a slight drop in CYBG's core capital levels and the rate of return in its mortgage business worried some analysts, chief executive David Duffy said the bank had a strong pipeline in both business and mortgage lending.
CYBG's common equity tier 1 ratio (CET 1) - a key measure of a lender's ability to absorb losses - fell to 12.5% from 12.6% at the end the first quarter.
CYBG said it had applied to the Bank of England to switch to an internal method of estimating its capital requirements, which it said should boost cash if approved.
And because Glasgow-based CYBG was "not aggressive" in its growth ambitions, this would protect it if the UK economy slowed, David Duffy - a former AIB CEO - said.
Mr Duffy declined to comment on whether CYBG was interested in buying Co-op Bank or its assets, adding that it did not need to do acquisitions to deliver its forecast of double-digit returns in financial year 2019.
Although CYBG has been cutting branches as it tries to move more business online, the CEO said the bank would look at opportunities to buy physical assets "without any prejudice".
Co-op bank, which has 4 million customers, is seeking a buyer after struggling to meet capital requirements.