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Investment Securities - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
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	2,110,000,000	$ 1,810,000,000
Investment in FHLB stock, impairment losses	$ 0
Debt securities weighted average remaining contractual maturity term	20 years
United States [Member]
Debt Securities, Available-for-sale [Line Items]
Securities issued by U.S. government percentage	94.00%

X

- Definition

Allowance for credit losses for securities in unrealized loss position.

+ References

No definition available.

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X

- Definition

Debt securities weighted average remaining contractual maturity term.

+ References

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- Definition

Securities issued by government or government sponsored agencies and enterprises percentage.

+ References

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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

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- Definition

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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