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Securities Sold Under Agreements to Repurchase - Schedule of Securities Sold under Agreements to Repurchase and Related Weighted-Average Interest Rates (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Securities Sold under Agreements to Repurchase [Abstract]
Securities sold under agreements to repurchase	$ 395,242,000	$ 318,067,000	$ 431,166,000
Average amount outstanding during the period	398,662,000	329,091,000
Maximum amount outstanding at any month-end during the period	$ 395,242,000	$ 318,067,000
Weighted average interest rate during period	0.12%	0.47%
Weighted average interest rate at end of period	0.12%	0.22%	0.12%

X

- Definition

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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-Topic 210
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Weighted average interest rate of short-term debt outstanding calculated at point in time.

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Weighted average interest rate of short-term debt outstanding calculated over time.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period.

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