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Mortgage Loans - Allowance for loan losses (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 01, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for loan credit losses, beginning of period $ (1,960) $ (16,136) $ (1,318) $ (1,960) $ (1,164)
Beginning period adjustment for CECL $ 10,200 0 0 (10,156) 0
Reversal of / (Increase in) provision for credit losses on mortgage loans   1,525 (85) (597) (239)
Reversal of / (Increase in) allowance for loan credit losses   161 0 (1,737) 0
Allowance for loan credit losses, end of period   $ (14,450) $ (1,403) $ (14,450) $ (1,403)