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Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Net gain (loss) on sales of securities | $ (499,000) | $ 15,712,000 | $ 1,295,000
Net unrealized gains (losses) recorded in comprehensive income | (123,000) | 15,300,000 | (586,000)
Unrealized Gains and Losses on Available for Sale Securities | Reclassification out of Accumulated Other Comprehensive Income |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Net gain (loss) on sales of securities | $ (499,000) | $ 15,700,000 | $ 1,300,000

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- Definition Amount of unrealized and realized gain (loss) on investment in debt and equity securities. + References Reference 1: 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(9)(a)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 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(7)(c)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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