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Investment Securities - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Debt securities, held-to-maturity, allowance for credit loss	$ 0	$ 0
Investment in FHLB stock, impairment losses	$ 0
Debt securities weighted average remaining contractual maturity term	23 years
Total deposits	$ 12,397,521,000	12,836,245,000
United States [Member]
Debt Securities, Available-for-sale [Line Items]
Securities issued by U.S. government percentage	91.00%
Investment Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Pledged to secure amount	$ 1,870,000,000	1,560,000,000
Total deposits	1,250,000,000	1,130,000,000
Secure public funds	551,200,000	652,000,000
Outstanding borrowings	695,000,000	550,000,000
Other purposes	20,000,000	27,000,000
Pledged to secure unused borrowing capacity	$ 1,900,000,000	$ 105,000,000

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Investment securities for other purposes

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Secure Public Funds

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

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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.

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

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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