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	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	$ 523
Nonaccrual with a related Allowance for Credit Loss	1,739	$ 1,918
Loans past due over 89 days still accuring	267
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	781
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	0
Commercial and Industrial [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	16
Nonaccrual with a related Allowance for Credit Loss	0
Loans past due over 89 days still accuring	35
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	50
Nonaccrual with a related Allowance for Credit Loss	140
Loans past due over 89 days still accuring	50
First Liens [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	364
Nonaccrual with a related Allowance for Credit Loss	811
Loans past due over 89 days still accuring	20
Second Liens and Lines of Credit [Member]
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual with No Allowance for Credit Loss	39
Nonaccrual with a related Allowance for Credit Loss	7
Loans past due over 89 days still accuring	105
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	54
Nonaccrual with a related Allowance for Credit Loss	0
Loans past due over 89 days still accuring	$ 57