Allowance for loan Losses - Changes in the Allowance for Credit Losses (Parenthetical) (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Jan. 01, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserve for credit losses	$ 37,160		$ 28,511
ASU 2016-13 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserve for credit losses		$ 37,861
ASU 2016-13 [Member] | PCD Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserve for credit losses	1,668	$ 1,668
Loans and leases receivable allowance net of change in estimates	$ 771