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Mortgage Loans - Allowance for loan losses (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for loan credit losses, beginning of period $ (17,890,000) $ (16,136,000) $ (13,712,000) $ (1,960,000)
Reclassification from non-credit discount to the allowance for changes in payment expectations 5,450,000 0 (3,782,000) 0
Decrease/(increase) in allowance for loan credit losses for loan acquisitions 6,000 0 (1,727,000) (4,000)
Credit loss expense on mortgage loans (139,000) (274,000) (593,000) (503,000)
Reclassification from non-credit discount to the allowance for losses for increases in the net present value of expected cash flows 0 161,000 0 (1,733,000)
Reversal of/(increase in) provision for credit losses due to increases/(decreases) in the net present value of expected cash flows 2,740,000 1,799,000 8,240,000 (94,000)
Reversal of allowance for reclass of pool 2017-D to mortgage loans held-for-sale, net 0 0 1,741,000 0
Allowance for loan credit losses, end of period (9,833,000) (14,450,000) (9,833,000) (14,450,000)
Beginning period adjustment for CECL adoption        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for loan credit losses, beginning of period $ 0 $ 0 $ 0 $ 10,156,000