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Loans and Allowance for Credit Losses - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 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 | $ 2,906,000 |  | $ 11,510,000 |  |
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 | 38,086,000 |  | 38,086,000 |  | 54,053,000
Loans with modifications to rate and payment due to reamortization | 86,000 | 694,000 | 284,000 | 766,000 |
Loans and Leases Receivable, Gross | 6,732,580,000 |  | 6,732,580,000 |  | 6,761,183,000
Loans and Leases Receivable, Net of Deferred Income | 6,732,580,000 | 6,949,716,000 | 6,732,580,000 | 6,949,716,000 | 6,761,183,000
Unearned Deferred (Fees) Costs on Loans | 2,600,000 |  | 2,600,000 |  | 6,000,000
Unearned Premiums | 6,300,000 |  | $ 6,300,000 |  | 7,000,000
Forecasted Value, National Unemployment, Percent |  |  | 5.13% |  |
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery |  |  | $ 9,500,000 | 12,400,000 |
Loan Pay Off | 6,900,000 |  | 6,900,000 |  |
Specific Reserve Related to Loan Pay Off | 300,000 |  | $ 300,000 |  |
Weighted average [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Forecasted Value, National Unemployment, Percent |  |  | 5.00% |  |
Maximum [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Forecasted Value, National Unemployment, Percent |  |  | 5.13% |  |
Time and Demand Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and Leases Receivable, Gross | 1,210,694,000 |  | $ 1,210,694,000 |  | 1,541,382,000
Originated Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs |  | 4,705,000 |  | 13,259,000 |
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs | 2,066,000 |  | 6,522,000 |  |
Loans and Leases Receivable, Gross | 1,224,591,000 |  | 1,224,591,000 |  | 1,555,986,000
Loans and Leases Receivable, Net of Deferred Income | 1,224,591,000 | 1,736,736,000 | 1,224,591,000 | 1,736,736,000 | 1,555,986,000
Commercial, financial, agricultural and other [Member] | Time and Demand Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs | 2,059,000 |  | 6,397,000 |  |
Loans and Leases Receivable, Gross | 1,210,694,000 |  | 1,210,694,000 |  | 1,541,382,000
Loans and Leases Receivable, Net of Deferred Income | 1,210,694,000 |  | 1,210,694,000 |  | 1,541,382,000
Loans And Leases Receivable, Paycheck Protection Program | 152,100,000 |  | 152,100,000 |  | 478,900,000
Commercial, financial, agricultural and other [Member] | Originated Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs |  |  |  | 5,166,000 |
Total Deferrals Still in Forbearance [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and Leases Receivable, Gross | 29,900,000 | $ 65,400,000 | $ 29,900,000 | 65,400,000 | 113,800,000
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 |  | $ 5,000,000 |  |

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