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Loans and Allowance for Loan Losses - Summary of Activity in Allowance for Loan Losses (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
Allowance for loan losses - beginning balance |  | $ 46,093 | $ 46,093 | [1],[2] | $ 36,395 |  |  |  |
Total charge-offs |  |  | (75,844) |  | (49,961) |  |  |  |
Total recoveries |  |  | 17,482 |  | 12,273 |  |  |  |
Net charge-offs | [3] |  | (58,362) |  | (37,688) |  |  |  |
Provision for loan losses |  | 59,008 | 69,817 |  | 47,386 | $ 59,008 | [4] |  |
Allowance for loan losses - ending balance |  | $ 46,093 | 46,093 | [1],[2] | 36,395 | $ 36,395 |  | $ 57,548 | [1],[2]
Recreation [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
Allowance for loan losses - beginning balance |  |  | 18,075 |  |  |  |  |  |
Total charge-offs |  |  | (23,543) |  | (24,433) |  |  |  |
Total recoveries |  |  | 9,086 |  | 7,014 |  |  |  |
Allowance for loan losses - ending balance |  |  | 18,075 |  |  |  |  | 27,348 |
Home Improvement [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
Allowance for loan losses - beginning balance |  |  | 2,608 |  |  |  |  |  |
Total charge-offs |  |  | (2,909) |  | (2,504) |  |  |  |
Total recoveries |  |  | 1,680 |  | 1,718 |  |  |  |
Allowance for loan losses - ending balance |  |  | 2,608 |  |  |  |  | 5,157 |
Commercial [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
Total charge-offs |  |  | (31) |  | (819) |  |  |  |
Total recoveries |  |  | 3 |  |  |  |  |  |
Medallion [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |
Allowance for loan losses - beginning balance |  |  | 25,410 |  |  |  |  |  |
Total charge-offs |  |  | (49,361) |  | (22,205) |  |  |  |
Total recoveries |  |  | 6,713 |  | $ 3,541 |  |  |  |
Allowance for loan losses - ending balance |  |  | $ 25,410 |  |  |  |  | $ 25,043 |
[1] | As of December 31, 2020, the general reserves previously recorded for the Company’s medallion loan portfolio had been reversed as all loans had been deemed impaired and written down to collateral value.
[2] | As of December 31, 2020, there was no allowance for loan losses and net charge-offs related to the strategic partnership loans.
[3] | As of December 31, 2020, cumulative charge-offs of loans and loan collateral in process of foreclosure in the medallion loan portfolio were $279,188, some of which represents collection opportunities for the Company.
[4] | Balance includes the nine months ended December 31, 2018 under Bank Holding Company Accounting and the three months ended March 31, 2018 under Investment Company Accounting.

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + 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)(4) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + 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)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + 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 (g) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 3: 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=121611835&loc=SL6953423-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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