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Debt - Summary of Interest and Fees Related to Debt (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |
Stated interest expense | $ 16,561 | $ 16,949 | $ 17,407
Amortization of deferred financing costs | 2,104 | 2,215 | 2,271
Total interest and financing expenses | $ 18,665 | $ 19,164 | $ 19,678
Weighted average stated interest rate, period end | 4.037% | 3.724% | 4.68%
Unused commitment fee rate, period end | 1.20% | 1.375% | 1.375%
SBA Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest expense | $ 3,747 | $ 3,810 | $ 5,140
Amortization of deferred financing costs | 598 | 532 | 549
Total interest and financing expenses | $ 4,345 | $ 4,342 | $ 5,689
Weighted average stated interest rate, period end | 3.479% | 2.676% | 3.297%
Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest expense | $ 1,424 | $ 1,467 | $ 1,642
Amortization of deferred financing costs | 394 | 453 | 397
Total interest and financing expenses | $ 1,818 | $ 1,920 | $ 2,039
Unused commitment fee rate, period end | 1.20% | 1.375% | 1.375%
Secured Borrowings |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest expense | $ 1,078 | $ 427 |
Total interest and financing expenses | $ 1,078 | $ 427 |
Weighted average stated interest rate, period end | 7.786% | 4.392% |
Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest expense | $ 10,312 | $ 11,245 | $ 10,625
Amortization of deferred financing costs | 1,112 | 1,230 | 1,325
Total interest and financing expenses | $ 11,424 | $ 12,475 | $ 11,950
Weighted average stated interest rate, period end | 4.125% | 4.125% | 5.342%

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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1F -Subparagraph (b)(2) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 + Details
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- Definition Interest and debt related expenses associated with nonoperating financing activities of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (210.5-03(11)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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