Loans and Allowance For Credit Losses - Summary of Non Accrual Loans and the Related Allowance for Credit Losses by Portfolio Segment (Detail) - Loans Receivable [Member] - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with No Allowance	$ 1,212	$ 3,761
Financing receivable non accrual with allowance	0	20
Nonaccrual	1,212	3,781
Commercial And Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with No Allowance	1,159	3,708
Financing receivable non accrual with allowance	0	20
Nonaccrual	1,159	3,728
SBA [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with No Allowance	53	53
Financing receivable non accrual with allowance	0	0
Nonaccrual	$ 53	$ 53