At June 30, 2020 the allowance for credit losses represented 1.36% of loans outstanding, as compared to 0.98% at December 31, 2019. The allowance for credit losses represented 185% of nonperforming loans at June 30, 2020, as compared to 151% at December 31, 2019. The higher coverage ratio was due to an increase in the allowance at June 30, 2020, substantially due to the implementation of CECL and the impact of COVID-19 on our expected future credit losses.
Total noninterest income for the three months ended June 30, 2020 increased to $12.5 million from $6.4 million for the three months ended June 30, 2019, a 96% increase. Service charges on deposits for the three months ended June 30, 2020 decreased to $942 thousand from $1.6 million for the three months ended June 30, 2019, a 41% decrease, due to lesser insufficient funds fees. Gain on sale of loans for the three months ended June 30, 2020 increased to $3.1 million from $1.9 million for the three months ended June 30, 2019, a 60% increase, due to higher gains on the sale of residential mortgage loans ($1.2 million). Other income for the three months ended June 30, 2020 increased to $6.9 million from $1.8 million for the three months ended June 30, 2019, a 277% increase, due substantially to higher gains associated with the origination, securitization, sale and servicing of FHA loans ($2.5 million), $1.4 million higher small business investment company (“SBIC”) income related to a Community Reinvestment Act (“CRA”) qualified investment fund, $921 thousand higher swap fee income, and $591 thousand higher prepayment fees. Net investment gains on sale were $713 thousand for the three months ended June 30, 2020 compared to $563 thousand for the same period in 2019. Residential mortgage loans closed were $308 million for the second quarter of 2020 as compared to $152 million for the second quarter of 2019.
The efficiency ratio, which measures the ratio of noninterest expense to total revenue, was 37.18% for the second quarter of 2020, as compared to 38.04% for the second quarter of 2019. Noninterest expenses totaled $34.9 million for the three months ended June 30, 2020, as compared to $33.4 million for the three months ended June 30, 2019, a 5% increase.
Salaries and employee benefits were $17.1 million for the three months ended June 30, 2020, as compared to $17.7 million for the same period in 2019, a decrease of $639 thousand or 4%.
Data processing expenses were $2.8 million for the three months ended June 30, 2020 compared to $2.6 million for the same period in 2019, a 6% increase.
Legal, accounting and professional fees increased $1.2 million for the three months ended June 30, 2020 compared to the three months ended June 30, 2019. The reasons for the decrease in salaries and employee benefits and the increase in legal, accounting and professional fees for the periods noted above are discussed in the “Noninterest Expense” section.
FDIC expenses were $2.0 million for the three months ended June 30, 2020 compared to $1.1 million for the same period in 2019, a 76% increase, due to a higher assessment base resulting from growth in total assets.
Other expenses were $4.5 million for the three months ended June 30, 2020 compared to $4.2 million for the same period in 2019, a 6% increase, due primarily to $940 thousand higher other real estate owned ("OREO") expense offset by lower broker fees ($497 thousand).
Net income for the six months ended June 30, 2020 was $52.0 million compared to $71.0 million for the six months ended June 30, 2019, a 27% decrease. Net income per basic common share for the six months ended June 30, 2020 was $1.60 compared to $2.06 per basic common share for the same period in 2019, a 22% decrease. Net income per diluted common share for the six months ended June 30, 2020 was $1.60 compared to $2.05 per diluted common share for the same period in 2019, a 22% decrease.
Net income declined for the six months ended June 30, 2020 relative to the same period in 2019 due substantially to increased provisioning for credit losses offset by higher noninterest income (as discussed below). In particular, the provision for credit losses increased to $34.0 million for the six months ended June 30, 2020 compared to $7.0 million for the same period in 2019, a 389% increase, as the Company implemented CECL effective January 1, 2020 and increased reserves associated with the impact of COVID-19 through the second quarter of 2020. See Note 1 and Note 5 for further detail on CECL.
The provision for income taxes was $17.8 million for the six months ended June 30, 2020, a decrease of $7.6 million, or 30%, compared to the same period in 2019. The decrease was primarily due to a significant decline in pre-tax income for the six months ended June 30, 2020 compared to the six months ended June 30, 2019, and a decrease in disallowed compensation deductions for key executives, mainly related to share based compensation awards and other compensation of our former CEO and Chairman who resigned in March 2019. The decrease in the effective income tax rate was recorded in the second quarter of 2020 based on a reduced pre-tax income budget for the year due to increased credit reserves significantly attributable to COVID-19.