Cash Equivalents - Additional Information (Detail) $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($)
Cash and Cash Equivalents [Abstract]
Cash equivalent maximum maturity period	3 months
Increase in Cash account over the insured limit	$ 22.2
Uninsured Amount	$ 6.7

Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock.

No definition available.

Name:	us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant