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Borrowings - Short Term Borrowings (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
FHLB advances	$ 700,000	$ 850,000
Federal funds purchased	75,000	250,000
Total short-term debt	$ 775,000	$ 1,100,000
FHLB advances, rate	0.26%	1.19%
Federal funds purchased, rate	0.05%	0.09%

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- Definition

Discloses the single interest rate [if] applicable to Federal Funds Purchased as of the Balance Sheet date.

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- Definition

Discloses the single interest rate [if] applicable to short-term advances from the Federal Home Loan Bank as of the Balance Sheet date.

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- Definition

Amount of short term borrowing where a bank borrows, at the federal funds rate, from another bank.

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Amount of advance from Federal Home Loan Bank (FHLBank) maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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