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Loans and Allowance for Loan Losses - Summary of TDRs (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) TDR | Dec. 31, 2019 USD ($) TDR
Recreation [Member] |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |
Number of Loans | TDR | 77 | 294
Pre- Modification Investment | $ 1,053 | $ 4,433
Post- Modification Investment | $ 749 | $ 2,831
Commercial Loans [Member] |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |
Number of Loans | TDR | 1 |
Pre- Modification Investment | $ 1,821 |
Post- Modification Investment | $ 1,821 |
Medallion [Member] |  |
Financing Receivable Recorded Investment Past Due [Line Items] |  |
Number of Loans | TDR | 59 | 71
Pre- Modification Investment | $ 33,505 | $ 31,376
Post- Modification Investment | $ 33,505 | $ 31,385

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- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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- Definition Amount, before troubled debt restructuring, of financing receivable to be modified. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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