The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

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

Derivatives - Additional Information (Detail) - USD ($)	12 Months Ended
Derivatives - Additional Information (Detail) - USD ($)	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivatives Fair Value [Line Items]
Swap fees	$ 247,000	$ 207,000	$ 1,459,000
Interest Rate Swap [Member] \| Collateral Pledged [Member]
Derivatives Fair Value [Line Items]
Cash and securities at fair value pledged for collateral		509,000
Cash and Cash Equivalents [Member] \| Interest Rate Swap [Member]
Derivatives Fair Value [Line Items]
Cash and securities at fair value pledged for collateral	$ 0	$ 10,780,000