Average earning assets totaled $956.1 million in the first quarter of 2013, which was largely unchanged from the 2012 Successor period but was an increase from $934.3 million in the 2012 Predecessor Period. While total average earning assets were unchanged from the 2012 Successor Period, the mix of earning assets over this period was significantly changed, reflecting loan growth and declining cash and securities balances to fund that loan growth. Average loan balances increased $46.6 million from the 2012 Successor Period to the first quarter of 2013 while the average balances of investment securities and federal funds sold and other interest-earning cash declined by $34.5 million and $12.0 million, respectively.
Income accretion on purchased loans totaled $3.6 million in the first quarter of 2013, which consisted of $3.4 million of accretion on purchased credit-impaired ("PCI") loans and $118 thousand of accretion income on purchased non-impaired loans. PCI loan accretion represents all interest income recorded for those loans in the period while accretion income on purchased non-impaired loans represents accretion of the fair value discount on the effective yield method, which increased interest income above contractual yields. The time deposit fair value premium amortization totaled $484 thousand, which reduced interest expense, while accretion of the fair value discount on long-term debt totaled $38 thousand, which increased interest expense. Time deposit amortization and long-term debt accretion reduced the Company's cost of interest-bearing liabilities by 0.22 percent in the first quarter of 2013.
Income accretion on purchased loans totaled $2.8 million and $1.6 million in the 2012 Successor Period and 2012 Predecessor Period, respectively. Net amortization of fair value premiums on interest-bearing liabilities in the 2012 Successor Period and 2012 Predecessor Period totaled $588 thousand and $298 thousand, respectively, which reduced the Company's cost of interest-bearing liabilities by 0.45 percent in each period.
Provision for Loan LossesProvision for loan losses in the first quarter of 2013 totaled $1.9 million while provision for loan losses totaled $869 thousand in the 2012 Successor Period and $195 thousand in the 2012 Predecessor Period. The allowance for loan losses ("ALL") and related provision were calculated in separate models for the following three portfolio categories: new loans, purchased non-impaired loans, and PCI loans.