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Mortgage Loans - Allowance for loan losses (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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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

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- Definition Financing Receivable, Allowance for Changes in Payment Expectations, Recovery + References No definition available. + Details
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- Definition Financing Receivable, Credit Loss, Expense on Mortgage Loans + References No definition available. + Details
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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) + Details
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- Definition Amount of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 19 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919265-210447 + Details
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