Webster Financial Corp. in Waterbury, Conn., said loan growth and higher returns from its HSA Bank subsidiary helped its fourth-quarter profit rise 4.5% year over year, to $50.6 million.

Earnings per share at the $24.7 billion-asset company rose 2% to 55 cents. It announced the results Thursday.

Net interest income rose 8% to $173.3 million even though the net interest margin compressed by 9 basis points to 3.08%.

The provision for credit losses rose 45% to $13.8 million. Net chargeoffs were $11.8 million, versus $6.7 million a year earlier, mainly because of increases in the commercial segment.

Total loans and leases rose 12.7% to $15.7 billion, with double-digit growth in commercial, commercial real estate and residential mortgage lending.

HSA Bank, based in Sheboygan, Wis., was augmented by Webster's purchase of JPMorgan Chase's health savings account business in January 2015. Thanks in part to the acquisition, Webster's deposit service fees rose 32% to $34.2 million in the fourth quarter.

Noninterest income rose 12.2% to $60.3 million. Noninterest expenses rose 12.4% to $143.3 million on increased costs related to HSA Bank, compensation and professional and outside services.

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