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Fair value of financial instruments (Tables)
6 Months Ended
Jun. 30, 2013
Fair Value Disclosures [Abstract]  
Fair value measurements, recurring and nonrecurring
The following table sets forth the financial assets and liabilities that we measure at fair value by level within the fair value hierarchy as of June 30, 2013 ($ in thousands):

Level 1
Level 2
Level 3

Quoted prices in active markets
 Observable inputs other than Level 1 prices
 Unobservable inputs
Recurring basis (assets)
 
 
 
Mortgage loans
$
—

$
—

$
163,520

Nonrecurring basis (assets)
 
 
 
Transfer of mortgage loans to real estate owned
$
—

$
—

$
4,399

Not recognized on consolidated balance sheets at fair value (liabilities)
 
 
 
Repurchase agreement at fair value
$
—

$
472

$
—

Fair value, assets measured on recurring basis, unobservable input reconciliation
The following table sets forth the changes in our level 3 assets that are measured at fair value on a recurring basis ($ in thousands):

Three months ended June 30, 2013
 
Six months ended June 30, 2013
Mortgage loans
 
 
 
Beginning balance
$
87,670

 
$
—

Investment in mortgage loans
79,908

 
168,165

Net unrealized gain on mortgage loans
7,165

 
8,293

Net realized gain on mortgage loans
1,719

 
2,106

Mortgage loan dispositions and repayments
(8,699
)
 
(10,645
)
Transfer of mortgage loans to real estate owned
(4,243
)
 
(4,399
)
Ending balance
$
163,520

 
$
163,520

 
 
 
 
Net unrealized gain on mortgage loans held
$
7,165

 
$
8,293

Accumulated net unrealized gain on mortgage loans held
$
8,293

 
$
8,293

Delinquency by unpaid principal balance
The following table sets forth the fair value of our mortgage loans and the related unpaid principal balance and collateral market value by delinquency as of June 30, 2013 ($ in thousands):

Number of loans
Carrying value
Unpaid principal balance
Collateral market value
Current
102

$
10,748

$
22,020

$
18,178

30
33

2,793

6,411

4,560

60
30

4,299

8,093

6,449

90
460

53,905

106,381

81,086

Foreclosure
707

91,775

185,077

134,500

Mortgage loans
1,332

$
163,520

$
327,982

$
244,773

Fair value measurements, recurring and nonrecurring, valuation techniques
The following table sets forth quantitative information about the significant unobservable inputs used to measure the fair value of our mortgage loans as of June 30, 2013:
Input
Range
Discount rate
15.0%
Gross monthly rental rate
$480 to $5,030
Home pricing index range       
-1.8% to 4.6%
Loan resolution probabilities - modification
0% to 22.3%
Loan resolution probabilities - rental
0% to 100.0%
Loan resolution probabilities - liquidation
0% to 100.0%
Loan resolution timelines
1 to 67 months

There were no corresponding fair value measurements which required significant unobservable inputs as of December 31, 2012 because we did not own any such assets at that time.