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Loans and Allowance for Loan Losses - Summary of Non Accrual Loan (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Receivables [Abstract] |  |  |
Total nonaccrual loans | $ 61,767 | $ 26,484 | $ 34,877
Interest foregone for the year | 3,311 | 2,152 | 1,153
Amount of foregone interest applied to principal for the year | 602 | 254 | 535
Interest foregone life-to-date | 5,252 | 2,744 | 1,952
Amount of foregone interest applied to principal life-to-date | $ 792 | $ 471 | $ 1,214
Percentage of nonaccrual loans to gross loan portfolio | 5.00% | 2.00% | 3.00%
Percentage of allowance for loan losses to nonaccrual loans | 93.00% | 174.00% | 104.00%

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- Definition Interest income foregone on non accrual loans. + References No definition available. + Details
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- Definition Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524 + Details
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- Definition Reflects the percentage derived from dividing impaired loans on which interest has ceased to be accrued by total loans. + References No definition available. + Details
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