Loans and Allowance For Loan Losses - Summary of Loan Portfolio Allocated by Management's Internal Risk Ratings (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	$ 1,352,639	$ 1,369,070
Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	425,643	414,548
Real Estate Construction And Land [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	41,558	37,193
SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	204,734	317,564
Other Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	64,253	49,075
Loans Receivable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	1,352,639	1,369,070
Loans Receivable [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	1,318,844	1,340,677
Loans Receivable [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	18,664	13,655
Loans Receivable [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	15,131	14,738
Loans Receivable [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	425,643	414,548
Loans Receivable [Member] | Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	409,874	401,629
Loans Receivable [Member] | Commercial And Industrial [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	13,026	9,013
Loans Receivable [Member] | Commercial And Industrial [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	2,743	3,906
Loans Receivable [Member] | Real Estate, Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	616,451	550,690
Loans Receivable [Member] | Real Estate, Other [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	604,110	540,153
Loans Receivable [Member] | Real Estate, Other [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	3,777	2,911
Loans Receivable [Member] | Real Estate, Other [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	8,564	7,626
Loans Receivable [Member] | Real Estate Construction And Land [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	41,558	37,193
Loans Receivable [Member] | Real Estate Construction And Land [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	37,576	34,543
Loans Receivable [Member] | Real Estate Construction And Land [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	1,297	872
Loans Receivable [Member] | Real Estate Construction And Land [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	2,685	1,778
Loans Receivable [Member] | SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	204,734	317,564
Loans Receivable [Member] | SBA [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	203,031	315,277
Loans Receivable [Member] | SBA [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	564	859
Loans Receivable [Member] | SBA [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	1,139	1,428
Loans Receivable [Member] | Other Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	64,253	49,075
Loans Receivable [Member] | Other Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	$ 64,253	$ 49,075