ALLOWANCE FOR LOAN LOSSES

As discussed in Note 1, the Company estimates for currently existing and probable losses for its mortgage loans that are considered impaired. A loan can be considered impaired even if it is not delinquent. The following table summarizes the aggregate activity for the portion of the allowance for loan losses that relates to the securitized mortgage loan portfolio for the periods indicated:



	Three Months Ended
	September 30,
	2012						2011
	Commercial			Single-family			Commercial			Single-family
Allowance at beginning of period	$	1,355		$	231		$	3,069		$	208
Provision for loan losses	(36		)	146			300			—
Credit losses, net of recoveries	(1,169		)	(110		)	(1,196		)	—
Allowance at end of period	$	150		$	267		$	2,173		$	208



	Nine Months Ended
	September 30,
	2012						2011
	Commercial			Single-family			Commercial			Single-family
Allowance at beginning of period	$	2,268		$	231		$	4,200		$	270
Provision for loan losses	24			146			750			—
Credit losses, net of recoveries	(2,142		)	(110		)	(2,777		)	(62		)
Allowance at end of period	$	150		$	267		$	2,173		$	208

The following table presents certain information on impaired securitized commercial and single-family mortgage loans as of September 30, 2012 and December 31, 2011:



	September 30, 2012						December 31, 2011
	Commercial			Single-family			Commercial			Single-family
Unpaid principal balance of impaired securitized loans	$	—		$	3,382		$	4,724		$	3,000
Basis adjustments related to impaired securitized loans	—			51			8			48
Amortized cost basis of impaired securitized loans	—			3,433			4,732			3,048
Allowance for loan losses	(150		)	(267		)	(2,268		)	(231		)
Investment in excess of allowance	$	(150	)	$	3,166		$	2,464		$	2,817

Although the Company does not currently have specific securitized commercial mortgage loans identified as impaired, the Company is maintaining a general allowance for commercial mortgage loan losses of $150 as indicated in the table above. The Company recognized $0 and $50 of interest income on impaired securitized commercial mortgage loans for the three and nine months ended September 30, 2012, respectively, compared to $27 and $83 of interest income for the three and nine months ended September 30, 2011, respectively. The Company recognized $47 and $141 of interest income on impaired securitized single-family mortgage loans for the three and nine months ended September 30, 2012, respectively, compared to $49 and $146 of interest income for the three and nine months ended September 30, 2011, respectively.