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Loans and Allowance for Credit Losses - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non Accrual Status Of Loans After Number Of Days Past Due |  |  | 90 days |  |
Default Status Of TDRs After Number Of Days Past Due |  |  | 90 days |  |
Charge-offs | $ 4,839,000 |  | $ 8,604,000 |  |
Unfunded commitments related to nonperforming loans | 200,000 |  | 200,000 |  | $ 200,000
Off balance sheet reserve to nonperforming loans |  |  |  |  | 26,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 0 | $ 0 | 0 | $ 0 |
Total gains or losses included in earnings | 0 | 0 | 0 | 0 |
Recorded investment | 52,793,000 |  | 52,793,000 |  | 54,053,000
Loans with modifications to rate and payment due to reamortization | 29,000 | 53,000 | 198,000 | 71,000 |
Loans and Leases Receivable, Gross | 6,740,535,000 |  | 6,740,535,000 |  | 6,761,183,000
Loans and Leases Receivable, Net of Deferred Income | 6,740,535,000 | 6,922,075,000 | 6,740,535,000 | 6,922,075,000 | 6,761,183,000
Unearned Deferred (Fees) Costs on Loans | 7,100,000 |  | 7,100,000 |  | 6,000,000.0
Unearned Premiums | 6,500,000 |  | $ 6,500,000 |  | 7,000,000.0
Forecasted Value, National Unemployment, Percent |  |  | 5.76% |  |
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery |  |  | $ 7,200,000 | 8,000,000.0 |
Weighted average [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Forecasted Value, National Unemployment, Percent |  |  | 5.37% |  |
Maximum [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Forecasted Value, National Unemployment, Percent |  |  | 5.76% |  |
Time and Demand Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and Leases Receivable, Gross | 1,360,065,000 |  | $ 1,360,065,000 |  | 1,541,382,000
Originated Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs |  | 4,768,000 |  | 8,554,000 |
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs | 3,887,000 |  | 4,456,000 |  |
Loans and Leases Receivable, Gross | 1,374,177,000 |  | 1,374,177,000 |  | 1,555,986,000
Loans and Leases Receivable, Net of Deferred Income | 1,374,177,000 | $ 1,773,099,000 | 1,374,177,000 | 1,773,099,000 | 1,555,986,000
Commercial, financial, agricultural and other [Member] | Time and Demand Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs | 3,878,000 |  | 4,338,000 |  |
Loans and Leases Receivable, Gross | 1,360,065,000 |  | 1,360,065,000 |  | 1,541,382,000
Loans and Leases Receivable, Net of Deferred Income | 1,360,065,000 |  | 1,360,065,000 |  | 1,541,382,000
Loans And Leases Receivable, Paycheck Protection Program | 292,400,000 |  | 292,400,000 |  | 478,900,000
Commercial, financial, agricultural and other [Member] | Originated Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs |  |  |  | 1,771,000 |
Total Deferrals Still in Forbearance [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and Leases Receivable, Gross | 59,500,000 |  | $ 59,500,000 |  |
Loans to individuals [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non Accrual Status Of Loans After Number Of Days Past Due |  |  | 150 days |  |
Nonaccrual Commercial Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Held for sale, Amount | 0 |  | $ 0 |  | $ 13,000
Loans and Leases Receivable, Gain (Loss) on Sales, Net |  |  | 400,000 | $ 0 |
Nonaccrual Commercial Loans Transferred to HFS |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Held for sale, Amount | $ 5,000,000.0 |  | $ 5,000,000.0 |  |

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