The composition of loans to banking clients by loan segment is as follows:

The Company has commitments to extend credit related to unused home equity lines of credit (HELOCs), personal loans secured by securities, and other lines of credit, which totaled $5.4 billion at both March 31, 2013, and December 31, 2012, respectively.

Changes in the allowance for loan losses were as follows:

Included in the loan portfolio are nonaccrual loans totaling $42 million and $48 million at March 31, 2013 and December 31, 2012, respectively. There were no loans accruing interest that were contractually 90 days or more past due at March 31, 2013 or December 31, 2012. Nonperforming assets, which include nonaccrual loans and other real estate owned, totaled $46 million and $54 million at March 31, 2013 and December 31, 2012, respectively.

In 2012, Schwab Bank launched a co-branded loan origination program for Schwab Bank clients (the Program) with Quicken Loans, Inc. (Quicken^® Loans^®). Pursuant to the Program, Quicken Loans originates and services first lien residential real estate mortgage loans (First Mortgages) and HELOCs for Schwab Bank clients. Under the Program, Schwab Bank purchases certain First Mortgages and HELOCs that are originated by Quicken Loans. Schwab Bank sets the underwriting guidelines and pricing for all loans it intends to purchase for its portfolio. Schwab Bank purchased First Mortgages of $1.3 billion and $71 million during the first quarters of 2013 and 2012, respectively. The First Mortgages purchased under the Program are included in the First mortgages loan class in the tables below.

The delinquency analysis by loan class is as follows:

In addition to monitoring delinquency, the Company monitors the credit quality of residential real estate mortgages and HELOCs by stratifying the portfolios by the year of origination, borrower FICO scores at origination (Origination FICO), updated borrower FICO scores (Updated FICO), LTV ratios at origination (Origination LTV), and estimated current LTV ratios (Estimated Current LTV), as presented in the following tables. Borrowers’ FICO scores are provided by an independent third party credit reporting service and were last updated in March 2013. The Origination LTV and Estimated Current LTV ratios for a HELOC include any first lien mortgage outstanding on the same property at the time of the HELOC’s origination. The Estimated Current LTV for each loan is estimated by reference to a home price appreciation index.

The Company monitors the credit quality of personal loans secured by securities by reviewing the fair value of collateral to ensure adequate collateralization of at least 100% of the principal amount of the loans. All of these personal loans were fully collateralized by securities with fair values in excess of borrowings at March 31, 2013 and December 31, 2012.