Loans And Allowance For Credit Losses- Non-Accrual Loans, Loans Still Accruing and Past Due 90 Days or More and Restructured Loans (Parenthetical) (Detail) - USD ($)		Dec. 31, 2022	Dec. 31, 2021
Loans And Leases Receivable Disclosure [Line Items]
Troubled debt restructured loans*	[1]	$ 19,000	$ 21,000
Doubtful [Member]
Loans And Leases Receivable Disclosure [Line Items]
Troubled debt restructured loans*		$ 3,624,000	$ 6,721,000

[1] Troubled debt restructured loans of $3,624,000 and $6,721,000, for which interest collection is doubtful, are included in nonaccrual loans as of December 31, 2022 and 2021, respectively.