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Loans and Allowance for Credit Losses - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
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 | $ 2,106,000 | $ 4,839,000 | $ 3,729,000 | $ 8,604,000 |
Unfunded commitments related to nonperforming loans | 100,000 |  | 100,000 |  | $ 200,000
Off balance sheet reserve to nonperforming loans | 0 |  | 0 |  | 0
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 | 35,692,000 |  | 35,692,000 |  | 55,180,000
Loans with modifications to rate and payment due to reamortization |  | 169,000 | 10,000 | 169,000 |
Loans and Leases Receivable, Gross | 7,119,754,000 |  | 7,119,754,000 |  | 6,839,230,000
Loans and Leases Receivable, Net of Deferred Income | 7,119,754,000 | 6,740,535,000 | $ 7,119,754,000 | 6,740,535,000 | 6,839,230,000
Forecasted Value, National Unemployment, Percent |  |  | 3.58% |  |
Financing Receivable, before Allowance for Credit Loss | 7,119,754,000 |  | $ 7,119,754,000 |  | 6,839,230,000
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery |  |  | 2,700,000 | 7,200,000 |
Net Deferred Fees |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and Leases Receivable, Deferred Income | 4,800,000 |  | 4,800,000 |  | 800,000
Unearned Premiums and Discounts |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and Leases Receivable, Deferred Income | (5,700,000) |  | (5,700,000) |  | (6,000,000)
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 4,844,000 |  | $ 4,844,000 |  | 6,450,000
Weighted average [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Forecasted Value, National Unemployment, Percent |  |  | 4.28% |  |
Maximum [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Forecasted Value, National Unemployment, Percent |  |  | 4.59% |  |
Time and Demand Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and Leases Receivable, Gross | 1,031,930,000 |  | $ 1,031,930,000 |  | 1,159,524,000
Multifamily |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans and Leases Receivable, Gross | 360,335,000 |  | 360,335,000 |  | 385,432,000
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs | 509,000 | 3,887,000 | 984,000 | 4,456,000 |
Loans and Leases Receivable, Gross | 1,170,583,000 |  | 1,170,583,000 |  | 1,173,452,000
Loans and Leases Receivable, Net of Deferred Income | 1,170,583,000 | 1,374,177,000 | 1,170,583,000 | 1,374,177,000 | 1,173,452,000
Financing Receivable, before Allowance for Credit Loss | 1,170,583,000 |  | 1,170,583,000 |  | 1,173,452,000
Commercial, financial, agricultural and other [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 121,000 |  | 121,000 |  | 633,000
Commercial, financial, agricultural and other [Member] | Time and Demand Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs | 139,000 | 3,878,000 | 283,000 | 4,338,000 |
Loans and Leases Receivable, Gross | 1,031,930,000 |  | 1,031,930,000 |  | 1,159,524,000
Loans and Leases Receivable, Net of Deferred Income | 1,031,930,000 | 1,360,065,000 | 1,031,930,000 | 1,360,065,000 | 1,159,524,000
Loans And Leases Receivable, Paycheck Protection Program | 12,900,000 |  | 12,900,000 |  | 71,300,000
Financing Receivable, before Allowance for Credit Loss | 1,031,930,000 |  | 1,031,930,000 |  | 1,159,524,000
Commercial, financial, agricultural and other [Member] | Time and Demand Loans | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 14,000 |  | 14,000 |  | 605,000
Commercial Real Estate [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs | 552,000 | 7,000 | 552,000 | 1,557,000 |
Loans and Leases Receivable, Gross | 2,319,094,000 |  | 2,319,094,000 |  | 2,251,097,000
Loans and Leases Receivable, Net of Deferred Income | 2,319,094,000 | 2,205,758,000 | 2,319,094,000 | 2,205,758,000 | 2,251,097,000
Financing Receivable, before Allowance for Credit Loss | 2,319,094,000 |  | 2,319,094,000 |  | 2,251,097,000
Commercial Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 76,000 |  | 76,000 |  | 0
Commercial Real Estate [Member] | Multifamily |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Charge-offs | 411,000 | 0 | 411,000 | 1,000 |
Loans and Leases Receivable, Gross | 360,335,000 |  | 360,335,000 |  | 385,432,000
Loans and Leases Receivable, Net of Deferred Income | 360,335,000 | $ 385,905,000 | 360,335,000 | 385,905,000 | 385,432,000
Financing Receivable, before Allowance for Credit Loss | 360,335,000 |  | 360,335,000 |  | 385,432,000
Commercial Real Estate [Member] | Multifamily | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 76,000 |  | $ 76,000 |  | 0
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 |  | $ 0
Loans and Leases Receivable, Gain (Loss) on Sales, Net |  |  | $ 0 | $ 0 |

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