Related Party Transactions - Additional Information (Details) - USD ($)
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1 Months Ended |
3 Months Ended |
9 Months Ended |
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Mar. 31, 2017 |
Sep. 30, 2020 |
Jun. 30, 2020 |
Sep. 30, 2019 |
Sep. 30, 2020 |
Sep. 30, 2019 |
Dec. 31, 2019 |
| Related Party Transaction [Line Items] |
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| Management fees |
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$ 7,393,000
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$ 7,418,000
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$ 22,234,000
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$ 22,162,000
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| ACM |
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| Related Party Transaction [Line Items] |
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| Management agreement, annual management fee |
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$ 1
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| Period of written notice of termination (in days) |
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180 days
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| Management fee reduction (as a percent) |
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40.00%
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| ACM | Restricted Stock Units (RSUs) |
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| Related Party Transaction [Line Items] |
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| Award vesting period |
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5 years
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| Corporate Joint Venture | BUCKLER Securities, LLC |
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| Related Party Transaction [Line Items] |
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| Payments to acquire equity method investments |
$ 352,000
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| Percentage of voting interests acquired |
10.00%
|
10.00%
|
|
|
10.00%
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| Equity method investments |
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$ 633,000
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|
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$ 633,000
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$ 381,000
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| Proceeds from divestiture of interest in joint venture |
|
117,000
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|
1,382,000
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| Required annual reduction in share of gross financing profit |
|
306,000
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$ 306,000
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| Armour Management Agreement | ACM |
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| Related Party Transaction [Line Items] |
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| Automatic renewal period of management agreement (in years) |
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5 years
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| Javelin Management Agreement | ACM |
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| Related Party Transaction [Line Items] |
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| Automatic renewal period of management agreement (in years) |
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1 year
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| Related party transaction, management agreement, term |
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1 year
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| Other Expense | ACM |
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| Related Party Transaction [Line Items] |
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|
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| Management fees |
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2,000
|
|
12,000
|
$ 150,000
|
78,000
|
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| Stock Based Compensation Expense | ACM |
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| Related Party Transaction [Line Items] |
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| Management fees |
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118,000
|
|
82,000
|
402,000
|
266,000
|
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| Required Regulatory Capital Requirement of Related Party | Corporate Joint Venture | BUCKLER Securities, LLC |
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| Related Party Transaction [Line Items] |
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| Loans receivable, related parties |
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105,000,000.0
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$ 105,000,000.0
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| Related party transaction, rate |
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0.00%
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| Loans and leases receivable, related parties, proceeds |
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$ 25,000
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$ 479,000
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$ 312,000
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$ 1,562,000
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