Credit Quality - Schedule of Troubled Debt Restructurings, Segregated by Class of Loans (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) Contract	Jun. 30, 2021 USD ($) Contract	Jun. 30, 2022 USD ($) Contract	Jun. 30, 2021 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	2	2	4
Pre-Modification Outstanding Recorded Investment	$ 132	$ 5,594	$ 2,933	$ 7,471
Post-Modification Outstanding Recorded Investment	$ 131	$ 5,545	$ 2,881	$ 7,579
Construction & Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Commercial Real Estate [Member] | Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	1	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 2,801	$ 940
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 2,750	$ 1,106
Commercial Real Estate [Member] | Nonowner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	1	0	2
Pre-Modification Outstanding Recorded Investment	$ 0	$ 5,413	$ 0	$ 6,350
Post-Modification Outstanding Recorded Investment	$ 0	$ 5,364	$ 0	$ 6,292
Other Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	1	1	1
Pre-Modification Outstanding Recorded Investment	$ 132	$ 181	$ 132	$ 181
Post-Modification Outstanding Recorded Investment	$ 131	$ 181	$ 131	$ 181
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Consumer [Member] | Bankcard [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Consumer [Member] | Other Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0