Loans and Allowance For Loan Losses - Summary of Loan Portfolio Allocated by Management's Internal Risk Ratings (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	$ 1,376,649	$ 1,369,070
Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	474,281	414,548
Real estate - construction and land [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	43,194	37,193
SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	81,403	317,564
Other Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	80,559	49,075
Loans Receivable [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	1,376,649	1,369,070
Loans Receivable [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	1,340,841	1,340,677
Loans Receivable [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	24,876	13,655
Loans Receivable [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	10,932	14,738
Loans Receivable [Member] | Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	474,281	414,548
Loans Receivable [Member] | Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	450,913	401,629
Loans Receivable [Member] | Commercial And Industrial [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	20,904	9,013
Loans Receivable [Member] | Commercial And Industrial [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	2,464	3,906
Loans Receivable [Member] | Real estate - other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	697,212	550,690
Loans Receivable [Member] | Real estate - other [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	690,916	540,153
Loans Receivable [Member] | Real estate - other [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	1,583	2,911
Loans Receivable [Member] | Real estate - other [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	4,713	7,626
Loans Receivable [Member] | Real estate - construction and land [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	43,194	37,193
Loans Receivable [Member] | Real estate - construction and land [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	39,074	34,543
Loans Receivable [Member] | Real estate - construction and land [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	1,278	872
Loans Receivable [Member] | Real estate - construction and land [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	2,842	1,778
Loans Receivable [Member] | SBA [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	81,403	317,564
Loans Receivable [Member] | SBA [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	79,379	315,277
Loans Receivable [Member] | SBA [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	1,111	859
Loans Receivable [Member] | SBA [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	913	1,428
Loans Receivable [Member] | Other Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	80,559	49,075
Loans Receivable [Member] | Other Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Credit Exposure	$ 80,559	$ 49,075