in net gain on the sale of securities available for sale (up $209 thousand) and net gain on the sale of portfolio loans (up $198 thousand).
The Company recorded income tax expense of $2.8 million in the year-to-date June 2015 period resulting in an effective tax rate of 23.6% versus an income tax expense of $2.2 million and an effective tax rate of 22.4% in the comparable period a year ago.
Asset Quality
Non-accrual loans totaled $5.5 million or 0.37% of loans outstanding at June 30, 2015 versus $13.0 million or 0.96% of total loans outstanding at December 31, 2014 and $13.9 million or 1.16% of loans outstanding at June 30, 2014. The allowance for loan losses as a percentage of total non-accrual loans amounted to 363%, 148% and 133% at June 30, 2015, December 31, 2014 and June 30, 2014, respectively. Total accruing loans delinquent 30 days or more amounted to $5 million or 0.31% of loans outstanding at June 30, 2015 as compared to $1 million or 0.10% of loans outstanding at December 31, 2014 and $4 million or 0.36% of loans outstanding at June 30, 2014.
Total criticized and classified loans were $33 million at June 30, 2015 versus $40 million at December 31, 2014 and $44 million at June 30, 2014. Criticized loans are those loans that are not classified but require some degree of heightened monitoring. Classified loans were $18 million at June 30, 2015 as compared to $30 million at December 31, 2014 and $34 million at June 30, 2014. The allowance for loan losses as a percentage of total classified loans was 114%, 64% and 55%, respectively, at the same dates.
At June 30, 2015, the Company had $13 million in troubled debt restructurings ("TDRs"), primarily consisting of commercial and industrial loans, commercial real estate loans and residential mortgages totaling $2 million, $5 million and $4 million, respectively. The Company had TDRs amounting to $20 million at December 31, 2014 and $22 million at June 30, 2014.
At June 30, 2015, the Company's allowance for loan losses amounted to $20.1 million or 1.36% of period-end loans outstanding. The allowance as a percentage of loans outstanding was 1.42% and 1.55% at December 31, 2014 and June 30, 2014, respectively. The Company recorded net loan recoveries of $726 thousand in the second quarter of 2015 versus net loan charge-offs of $125 thousand in the first quarter of 2015 and net loan recoveries of $491 thousand in the second quarter of 2014. As a percentage of average total loans outstanding, these net amounts represented, on an annualized basis, (0.21%) for the second quarter of 2015, 0.04% for the first quarter of 2015 and (0.17%) for the second quarter of 2014.
The Company held no OREO during any of the reported periods.
Capital
Total stockholders' equity was $191 million at June 30, 2015 compared to $183 million at December 31, 2014 and $180 million at June 30, 2014. The increase in stockholders' equity versus June 30, 2014 was due to net income recorded during the past twelve months, net of dividends paid. The Company's return on average common stockholders' equity was 10.88% and 9.85% for the three and six months ended June 30, 2015 versus 8.55% and 8.68%, respectively, for the comparable 2014 periods.
The Bank's tier 1 leverage, common equity tier 1 risk-based, tier 1 risk-based and total risk-based capital ratios were 9.95%, 11.83%, 11.83% and 13.08%, respectively, at June 30, 2015. Each of these ratios exceeds the regulatory guidelines for a "well capitalized" institution, the highest regulatory capital category.
The Company's capital ratios also exceeded all regulatory requirements at June 30, 2015. The Company's TCE ratio (non-GAAP financial measure) was 9.43% at June 30, 2015 versus 9.50% at December 31, 2014 and 10.06% at June 30, 2014.
Corporate Information
Suffolk Bancorp is a one-bank holding company engaged in the commercial banking business through Suffolk County National Bank, a full service commercial bank headquartered in Riverhead, New York and Suffolk Bancorp's wholly owned subsidiary. Organized in