Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans (Parenthetical) (Detail)	Mar. 31, 2024 USD ($) Borrower	Dec. 31, 2023 USD ($) Borrower
Receivables [Abstract]
Number of borrowers with loan balance greater than one million | Borrower	4	2
Borrowers with large amount of loans outstanding, minimum amount of loans per borrower	$ 1,000,000	$ 1,000,000
Borrowers with large amount of loans outstanding, net	$ 10,900,000	$ 7,200,000