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Investment Securities - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |
Securities issued by U.S. government percentage | 91.00% |
Debt Securities, Held-to-Maturity, Allowance for Credit Loss | $ 0 | $ 0
Average life of investment grade debt securities, years | 6 years 9 months 18 days |
Credit-related impairment loss on investment securities held-to-maturity | $ 0 | 0
Investment securities pledged as collateral | 2,900,000,000 | $ 2,180,000,000
Investment in FHLB stock, impairment losses | $ 0 |
Debt securities weighted average remaining contractual maturity term | 23 years |
Municipal Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Average life of investment grade debt securities, years | 13 years 8 months 12 days |
CMO/REMIC |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment contractual cash flows guaranteed by Government, percentage | 100.00% |
Municipal Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total investment portfolio representing municipal bonds, percentage | 8.60% |

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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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