Allowance for Credit Losses - Summary of Amortized Cost Basis of Nonaccrual Loans and Loans Past due Over 89 Days Still Accruing (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	$ 1,755
Nonaccrual with a related Allowance for Credit Loss	140	$ 1,918
Loans past due over 89 days still accuring	1,063
Agriculture and Farmland [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	0
Nonaccrual with a related Allowance for Credit Loss	0
Loans past due over 89 days still accuring	0
Construction [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	0
Nonaccrual with a related Allowance for Credit Loss	0
Loans past due over 89 days still accuring	192
Commercial and Industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	13
Nonaccrual with a related Allowance for Credit Loss	0
Loans past due over 89 days still accuring	110
Multifamily [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	0
Nonaccrual with a related Allowance for Credit Loss	0
Loans past due over 89 days still accuring	0
Owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	0
Nonaccrual with a related Allowance for Credit Loss	0
Loans past due over 89 days still accuring	0
Non-owner Occupied [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	292
Nonaccrual with a related Allowance for Credit Loss	140
Loans past due over 89 days still accuring	558
First Liens [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	1,357
Nonaccrual with a related Allowance for Credit Loss	0
Loans past due over 89 days still accuring	112
Second Liens and Lines of Credit [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	43
Nonaccrual with a related Allowance for Credit Loss	0
Loans past due over 89 days still accuring	90
Municipal [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	0
Nonaccrual with a related Allowance for Credit Loss	0
Loans past due over 89 days still accuring	0
Consumer [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	50
Nonaccrual with a related Allowance for Credit Loss	0
Loans past due over 89 days still accuring	$ 1