Loans and finance receivables are summarized as follows (in millions).


	December 31,
	2022			2021
Loans and finance receivables before allowances and discounts	$	24,664		$	22,065
Allowances for credit losses		(856	)		(765	)
Unamortized acquisition discounts and points		(600	)		(549	)
	$	23,208		$	20,751

Loans and finance receivables are principally manufactured home loans, and to a lesser extent, commercial loans and site-built home loans. Reconciliations of the allowance for credit losses on loans and finance receivables for the three years ending December 31, 2022 follow (in millions).


	2022			2021			2020
Balance at beginning of year	$	765		$	712		$	167
Adoption of ASC 326		—			—			486
Provision for credit losses		124			88			177
Charge-offs, net of recoveries		(33	)		(35	)		(118	)
Balance at December 31	$	856		$	765		$	712

At December 31, 2022, substantially all manufactured and site-built home loan balances were evaluated collectively for impairment. At December 31, 2022, we considered approximately 96% of the loan balances to be current as to payment status. A summary of performing and non-performing home loans before discounts and allowances by year of loan origination as of December 31, 2022 follows (in millions).


	Origination Year
	2022		2021		2020		2019		2018		Prior		Total
Performing	$	5,743	$	3,630	$	2,830	$	1,992	$	1,509	$	6,959	$	22,663
Non-performing		4		9		9		8		6		46		82
	$	5,747	$	3,639	$	2,839	$	2,000	$	1,515	$	7,005	$	22,745

We are the lender under several commercial loan agreements which had a principal value of approximately $1.9 billion at December 31, 2022 and December 31, 2021. The balance at December 31, 2022 included $450 million acquired in connection with the Alleghany acquisition. Our largest commercial loan is with Seritage Growth Properties (“Seritage”) with an unpaid principal balance of $1.0 billion as of December 31, 2022 and $1.4 billion as of December 31, 2021. Our commercial loans are generally secured by mortgages on real estate properties or by other assets and substantially all of these loans are current as to payment status.