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Investment Securities - Additional Information (Detail) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, held-to-maturity, allowance for credit loss | $ 0 | $ 0
Allowance for credit losses for securities in unrealized loss position | 0 | 0
Investment securities pledged as collateral | 2,310,000,000 | $ 2,180,000,000
Investment in FHLB stock, impairment losses | $ 0 |
Debt securities weighted average remaining contractual maturity term | 23 years |
United States [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Securities issued by U.S. government percentage | 92.00% |

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- Definition Accumulated other comprehensive loss related to portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized as available-for-sale that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 9A -URI https://asc.fasb.org/extlink&oid=124260329&loc=SL6284427-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 + Details
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