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Debt - Schedule of Repurchase Transactions and Facilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Amount of Collateral $ 607,167 $ 580,167
Master Repurchase Agreement    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity 938,065 918,521
Amount Outstanding 431,091 414,114
Amount of Collateral $ 607,167 $ 580,167
Percentage of Collateral Coverage 141.00% 140.00%
Interest Rate 3.86% 3.77%
Master Repurchase Agreement | July 10, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 250,000 $ 250,000
Amount Outstanding 30,141 28,931
Amount of Collateral $ 44,217 $ 57,397
Percentage of Collateral Coverage 147.00% 198.00%
Interest Rate 3.38% 4.28%
Master Repurchase Agreement | September 24, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 400,000 $ 400,000
Amount Outstanding 112,885 116,662
Amount of Collateral $ 164,103 $ 164,403
Percentage of Collateral Coverage 145.00% 141.00%
Interest Rate 3.11% 4.24%
Class A Notes | Master Repurchase Agreement | January 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 1,644
Amount Outstanding   1,644
Amount of Collateral   $ 2,388
Percentage of Collateral Coverage   145.00%
Interest Rate   3.55%
2018-C | Class A Notes | Master Repurchase Agreement | March 25, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 7,075
Amount Outstanding   7,075
Amount of Collateral   $ 10,024
Percentage of Collateral Coverage   142.00%
Interest Rate   3.96%
2018-C | Class A Notes | Master Repurchase Agreement | April 27, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 4,108  
Amount Outstanding 4,108  
Amount of Collateral $ 7,101  
Percentage of Collateral Coverage 173.00%  
Interest Rate 3.71%  
2018-C | Class B Notes | Master Repurchase Agreement | March 25, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 5,851
Amount Outstanding   5,851
Amount of Collateral   $ 7,423
Percentage of Collateral Coverage   127.00%
Interest Rate   3.81%
2018-C | Class B Notes | Master Repurchase Agreement | April 27, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 4,811  
Amount Outstanding 4,811  
Amount of Collateral $ 10,024  
Percentage of Collateral Coverage 208.00%  
Interest Rate 3.71%  
2019-A | Master Repurchase Agreement | June 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 11,181  
Amount Outstanding 11,181  
Amount of Collateral $ 14,682  
Percentage of Collateral Coverage 131.00%  
Interest Rate 3.11%  
2019-A | Master Repurchase Agreement | January 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 11,966
Amount Outstanding   11,966
Amount of Collateral   $ 15,742
Percentage of Collateral Coverage   132.00%
Interest Rate   3.45%
2019-A | Class A Notes | Master Repurchase Agreement | June 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 3,827  
Amount Outstanding 3,827  
Amount of Collateral $ 4,907  
Percentage of Collateral Coverage 128.00%  
Interest Rate 3.11%  
2019-A | Class A Notes | Master Repurchase Agreement | January 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 10,648
Amount Outstanding   10,648
Amount of Collateral   $ 14,058
Percentage of Collateral Coverage   132.00%
Interest Rate   3.45%
2019-A | Class B Notes | Master Repurchase Agreement | April 2, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 1,758  
Amount Outstanding 1,758  
Amount of Collateral $ 2,388  
Percentage of Collateral Coverage 136.00%  
Interest Rate 2.96%  
2019-A | Class B Notes | Master Repurchase Agreement | January 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 5,485
Amount Outstanding   5,485
Amount of Collateral   $ 7,050
Percentage of Collateral Coverage   129.00%
Interest Rate   3.45%
2019-B | Master Repurchase Agreement | June 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 10,019  
Amount Outstanding 10,019  
Amount of Collateral $ 13,192  
Percentage of Collateral Coverage 132.00%  
Interest Rate 3.11%  
2019-B | Master Repurchase Agreement | January 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 4,096
Amount Outstanding   4,096
Amount of Collateral   $ 5,261
Percentage of Collateral Coverage   128.00%
Interest Rate   3.45%
2019-B | Class A Notes | Master Repurchase Agreement | June 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 5,161  
Amount Outstanding 5,161  
Amount of Collateral $ 6,616  
Percentage of Collateral Coverage 128.00%  
Interest Rate 3.11%  
2019-B | Class B Notes | Master Repurchase Agreement | April 2, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 1,684  
Amount Outstanding 1,684  
Amount of Collateral $ 2,287  
Percentage of Collateral Coverage 136.00%  
Interest Rate 2.96%  
2019-B | Class B Notes | Master Repurchase Agreement | January 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 1,576
Amount Outstanding   1,576
Amount of Collateral   $ 2,287
Percentage of Collateral Coverage   145.00%
Interest Rate   3.55%
2018-A | Class A Notes | Master Repurchase Agreement | June 30, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 5,116  
Amount Outstanding 5,116  
Amount of Collateral $ 6,721  
Percentage of Collateral Coverage 131.00%  
Interest Rate 3.56%  
2018-A | Class A Notes | Master Repurchase Agreement | January 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 6,093
Amount Outstanding   6,093
Amount of Collateral   $ 9,038
Percentage of Collateral Coverage   148.00%
Interest Rate   3.45%
2018-G | Master Repurchase Agreement | June 19, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 14,599  
Amount Outstanding 14,599  
Amount of Collateral $ 19,893  
Percentage of Collateral Coverage 136.00%  
Interest Rate 6.22%  
2018-G | Master Repurchase Agreement | January 21, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 15,718
Amount Outstanding   15,718
Amount of Collateral   $ 20,623
Percentage of Collateral Coverage   131.00%
Interest Rate   3.41%
2018-G | Class A Notes | Master Repurchase Agreement | June 19, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 9,571  
Amount Outstanding 9,571  
Amount of Collateral $ 13,043  
Percentage of Collateral Coverage 136.00%  
Interest Rate 6.22%  
2018-G | Class A Notes | Master Repurchase Agreement | January 21, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 10,305
Amount Outstanding   10,305
Amount of Collateral   $ 13,521
Percentage of Collateral Coverage   131.00%
Interest Rate   3.41%
2018-G | Class B Notes | Master Repurchase Agreement | June 19, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 2,665  
Amount Outstanding 2,665  
Amount of Collateral $ 4,050  
Percentage of Collateral Coverage 152.00%  
Interest Rate 6.72%  
2018-G | Class B Notes | Master Repurchase Agreement | January 21, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 5,840
Amount Outstanding   5,840
Amount of Collateral   $ 7,324
Percentage of Collateral Coverage   125.00%
Interest Rate   3.41%
2017-D | Class A Notes | Master Repurchase Agreement | April 22, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 35,381  
Amount Outstanding 35,381  
Amount of Collateral $ 51,679  
Percentage of Collateral Coverage 146.00%  
Interest Rate 5.00%  
2017-D | Class A Notes | Master Repurchase Agreement | June 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 4,704 $ 6,097
Amount Outstanding 4,704 6,097
Amount of Collateral $ 5,755 $ 7,891
Percentage of Collateral Coverage 122.00% 129.00%
Interest Rate 3.64% 3.64%
2017-D | Class A Notes | Master Repurchase Agreement | February 24, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 41,412
Amount Outstanding   41,412
Amount of Collateral   $ 54,828
Percentage of Collateral Coverage   132.00%
Interest Rate   2.92%
2018-D | Class A Notes | Master Repurchase Agreement | March 27, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 2,915
Amount Outstanding   2,915
Amount of Collateral   $ 3,709
Percentage of Collateral Coverage   127.00%
Interest Rate   3.79%
2018-D | Class A Notes | Master Repurchase Agreement | April 27, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 2,153  
Amount Outstanding 2,153  
Amount of Collateral $ 10,938  
Percentage of Collateral Coverage 508.00%  
Interest Rate 3.86%  
2018-D | Class A Notes | Master Repurchase Agreement | June 30, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 8,328  
Amount Outstanding 8,328  
Amount of Collateral $ 3,656  
Percentage of Collateral Coverage 44.00%  
Interest Rate 3.56%  
2018-D | Class A Notes | Master Repurchase Agreement | January 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 5,175
Amount Outstanding   5,175
Amount of Collateral   $ 6,855
Percentage of Collateral Coverage   132.00%
Interest Rate   3.45%
2017-B | Class B 1 Notes | Master Repurchase Agreement | June 30, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 6,099  
Amount Outstanding 6,099  
Amount of Collateral $ 9,038  
Percentage of Collateral Coverage 148.00%  
Interest Rate 3.56%  
2017-B | Class B 1 Notes | Master Repurchase Agreement | January 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 8,411
Amount Outstanding   8,411
Amount of Collateral   $ 11,098
Percentage of Collateral Coverage   132.00%
Interest Rate   3.45%
2017-B | Class B 2 Notes | Master Repurchase Agreement | April 27, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 5,749  
Amount Outstanding 5,749  
Amount of Collateral $ 7,464  
Percentage of Collateral Coverage 130.00%  
Interest Rate 3.00%  
2017-B | Class B 2 Notes | Master Repurchase Agreement | January 28, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 5,318
Amount Outstanding   5,318
Amount of Collateral   $ 7,464
Percentage of Collateral Coverage   140.00%
Interest Rate   3.19%
2017-B | Class M1 Notes | Master Repurchase Agreement | February 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 7,568
Amount Outstanding   7,568
Amount of Collateral   $ 9,702
Percentage of Collateral Coverage   128.00%
Interest Rate   4.19%
2017-B | Class M1 Notes | Master Repurchase Agreement | July 31, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 7,763  
Amount Outstanding 7,763  
Amount of Collateral $ 9,702  
Percentage of Collateral Coverage 125.00%  
Interest Rate 3.56%  
2017-B | Class M2 Notes | Master Repurchase Agreement | February 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 6,664
Amount Outstanding   6,664
Amount of Collateral   $ 9,537
Percentage of Collateral Coverage   143.00%
Interest Rate   4.19%
2017-B | Class M2 Notes | Master Repurchase Agreement | July 31, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 7,151  
Amount Outstanding 7,151  
Amount of Collateral $ 9,537  
Percentage of Collateral Coverage 133.00%  
Interest Rate 3.56%  
2018-E | Class A Notes | Master Repurchase Agreement | June 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 3,053 $ 4,704
Amount Outstanding 3,053 4,704
Amount of Collateral $ 3,959 $ 6,106
Percentage of Collateral Coverage 130.00% 130.00%
Interest Rate 3.64% 3.64%
2018-E | Class B Notes | Master Repurchase Agreement | June 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 1,132 $ 3,053
Amount Outstanding 1,132 3,053
Amount of Collateral $ 1,607 $ 4,035
Percentage of Collateral Coverage 142.00% 132.00%
Interest Rate 3.79% 3.64%
2018-F | Class A Notes | Master Repurchase Agreement | June 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 6,097 $ 2,332
Amount Outstanding 6,097 2,332
Amount of Collateral $ 7,565 $ 3,360
Percentage of Collateral Coverage 124.00% 144.00%
Interest Rate 3.64% 3.79%
2018-F | Class B Notes | Master Repurchase Agreement | June 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 2,332 $ 1,132
Amount Outstanding 2,332 1,132
Amount of Collateral $ 3,360 $ 1,607
Percentage of Collateral Coverage 144.00% 142.00%
Interest Rate 3.79% 3.79%
2019-C | Class A Notes | Master Repurchase Agreement | June 30, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 5,286 $ 5,286
Amount Outstanding 5,286 5,286
Amount of Collateral $ 6,850 $ 7,044
Percentage of Collateral Coverage 130.00% 133.00%
Interest Rate 3.57% 3.57%
2019-C | Class B Notes | Master Repurchase Agreement | June 30, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 3,324 $ 3,324
Amount Outstanding 3,324 3,324
Amount of Collateral $ 4,667 $ 4,667
Percentage of Collateral Coverage 140.00% 140.00%
Interest Rate 3.72% 3.72%
2018-B | Class A Notes | Master Repurchase Agreement | June 19, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 4,691  
Amount Outstanding 4,691  
Amount of Collateral $ 6,089  
Percentage of Collateral Coverage 130.00%  
Interest Rate 6.22%  
2018-B | Class A Notes | Master Repurchase Agreement | January 21, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 2,784
Amount Outstanding   2,784
Amount of Collateral   $ 4,050
Percentage of Collateral Coverage   145.00%
Interest Rate   3.51%
2017-C | Class B Notes | Master Repurchase Agreement | July 10, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 9,020  
Amount Outstanding 9,020  
Amount of Collateral $ 13,016  
Percentage of Collateral Coverage 144.00%  
Interest Rate 3.67%  
2017-C | Class B Notes | Master Repurchase Agreement | January 13, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 8,956
Amount Outstanding   8,956
Amount of Collateral   $ 13,016
Percentage of Collateral Coverage   145.00%
Interest Rate   4.16%
2019-E | Class A Notes | Master Repurchase Agreement | March 26, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 27,075
Amount Outstanding   27,075
Amount of Collateral   $ 34,591
Percentage of Collateral Coverage   128.00%
Interest Rate   3.81%
2019-E | Class A Notes | Master Repurchase Agreement | June 26, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 20,906  
Amount Outstanding 20,906  
Amount of Collateral $ 31,930  
Percentage of Collateral Coverage 153.00%  
Interest Rate 9.23%  
2019-E | Class B Notes | Master Repurchase Agreement | April 27, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 2,522  
Amount Outstanding 2,522  
Amount of Collateral $ 3,381  
Percentage of Collateral Coverage 134.00%  
Interest Rate 2.80%  
2019-E | Class B Notes | Master Repurchase Agreement | January 28, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 2,520
Amount Outstanding   2,520
Amount of Collateral   $ 3,381
Percentage of Collateral Coverage   134.00%
Interest Rate   2.99%
2019-G | Class A Notes | Master Repurchase Agreement | June 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 20,987  
Amount Outstanding 20,987  
Amount of Collateral $ 27,814  
Percentage of Collateral Coverage 133.00%  
Interest Rate 3.11%  
2019-G | Class A Notes | Master Repurchase Agreement | January 10, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 21,088
Amount Outstanding   21,088
Amount of Collateral   $ 28,284
Percentage of Collateral Coverage   134.00%
Interest Rate   3.47%
2019-G | Class B Notes | Master Repurchase Agreement | June 3, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 1,848  
Amount Outstanding 1,848  
Amount of Collateral $ 2,640  
Percentage of Collateral Coverage 143.00%  
Interest Rate 3.21%  
2019-G | Class B Notes | Master Repurchase Agreement | January 10, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity   $ 1,808
Amount Outstanding   1,808
Amount of Collateral   $ 2,640
Percentage of Collateral Coverage   146.00%
Interest Rate   3.57%
2019-H | Class A Notes | Master Repurchase Agreement | June 19, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 13,447 $ 13,447
Amount Outstanding 13,447 13,447
Amount of Collateral $ 17,077 $ 18,076
Percentage of Collateral Coverage 127.00% 134.00%
Interest Rate 3.55% 3.55%
2019-H | Class B Notes | Master Repurchase Agreement | June 19, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 1,155 $ 1,155
Amount Outstanding 1,155 1,155
Amount of Collateral $ 1,687 $ 1,687
Percentage of Collateral Coverage 146.00% 146.00%
Interest Rate 3.70% 3.70%
2020-A | Class A Notes | Master Repurchase Agreement | April 13, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 37,201  
Amount Outstanding 37,201  
Amount of Collateral $ 49,877  
Percentage of Collateral Coverage 134.00%  
Interest Rate 2.46%  
2020-A | Class B Notes | Master Repurchase Agreement | April 13, 2020    
Debt Instrument [Line Items]    
Maximum Borrowing Capacity $ 3,236  
Amount Outstanding 3,236  
Amount of Collateral $ 4,655  
Percentage of Collateral Coverage 144.00%  
Interest Rate 2.56%  
Mortgage loans    
Debt Instrument [Line Items]    
Percentage of Collateral Coverage 139.00% 138.00%
Mortgage loans | 2017-B    
Debt Instrument [Line Items]    
Percentage of Collateral Coverage 149.00% 144.00%
Mortgage loans | 2018-C    
Debt Instrument [Line Items]    
Percentage of Collateral Coverage 125.00% 122.00%
Mortgage loans | 2017-D    
Debt Instrument [Line Items]    
Percentage of Collateral Coverage 244.00% 243.00%