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Loans and Allowance for Credit Losses - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
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 $ 5,469,000 $ 9,343,000 $ 11,032,000 $ 11,226,000 $ 33,267,000
Unfunded commitments related to nonperforming loans 400,000   400,000   100,000
Off balance sheet reserve to nonperforming loans 0   0   0
Total gains or losses included in earnings (5,000) 0 (11,000) 0  
Recorded investment 57,119,000   57,119,000   39,472,000
Loans and Leases Receivable, Gross 8,994,890,000   8,994,890,000   8,968,761,000
Loans and Leases Receivable, Net of Deferred Income 8,994,890,000   $ 8,994,890,000   8,968,761,000
Forecasted Value, National Unemployment, Percent     3.99%    
Financing Receivable, before Allowance for Credit Loss 8,994,890,000   $ 8,994,890,000   8,968,761,000
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery     8,700,000 9,800,000  
Post- Modification Outstanding Recorded Investment 10,113,000 405,000 11,810,000 429,000  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default     0    
Net Deferred Fees          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and Leases Receivable, Deferred Income 11,600,000   11,600,000   8,200,000
Unearned Premiums and Discounts          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans and Leases Receivable, Deferred Income (22,000,000)   (22,000,000)   (25,700,000)
Financial Asset, 30 to 59 Days Past Due [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, before Allowance for Credit Loss 33,141,000   33,141,000   16,958,000
Financial Asset, Not Past Due          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, before Allowance for Credit Loss 8,899,529,000   $ 8,899,529,000   8,899,737,000
Weighted average [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Forecasted Value, National Unemployment, Percent     4.71%    
Maximum [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Forecasted Value, National Unemployment, Percent     4.92%    
Time and Demand Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Charge-offs     $ 3,377,000   16,147,000
Loans and Leases Receivable, Gross 1,189,361,000   1,189,361,000   1,187,300,000
Multifamily          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Charge-offs     0   0
Loans and Leases Receivable, Gross 590,471,000   590,471,000   551,142,000
Nonowner Occupied Commercial Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Charge-offs     470,000   4,705,000
Loans and Leases Receivable, Gross 1,766,550,000   1,766,550,000   1,772,785,000
Commercial, financial, agricultural and other [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Charge-offs 2,588,000 6,677,000 5,250,000 7,340,000  
Loans and Leases Receivable, Gross 1,629,516,000   1,629,516,000   1,543,349,000
Loans and Leases Receivable, Net of Deferred Income 1,629,516,000   1,629,516,000   1,543,349,000
Financing Receivable, before Allowance for Credit Loss 1,629,516,000   1,629,516,000   1,543,349,000
Post- Modification Outstanding Recorded Investment 245,000   1,471,000    
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 910,000   910,000   1,206,000
Commercial, financial, agricultural and other [Member] | Financial Asset, Not Past Due          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, before Allowance for Credit Loss 1,614,160,000   1,614,160,000   1,527,151,000
Commercial, financial, agricultural and other [Member] | Time and Demand Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Charge-offs 1,612,000 6,215,000 3,377,000 6,470,000  
Loans and Leases Receivable, Gross 1,189,361,000   1,189,361,000   1,187,300,000
Loans and Leases Receivable, Net of Deferred Income 1,189,361,000   1,189,361,000   1,187,300,000
Financing Receivable, before Allowance for Credit Loss 1,189,361,000   1,189,361,000   1,187,300,000
Post- Modification Outstanding Recorded Investment 245,000   1,303,000    
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 193,000   193,000   565,000
Commercial, financial, agricultural and other [Member] | Time and Demand Loans | Financial Asset, Not Past Due          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, before Allowance for Credit Loss 1,176,291,000   1,176,291,000   1,172,639,000
Commercial Real Estate [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Charge-offs 341,000 1,517,000 624,000 1,517,000  
Loans and Leases Receivable, Gross 3,077,013,000   3,077,013,000   3,053,152,000
Loans and Leases Receivable, Net of Deferred Income 3,077,013,000   3,077,013,000   3,053,152,000
Financing Receivable, before Allowance for Credit Loss 3,077,013,000   3,077,013,000   3,053,152,000
Post- Modification Outstanding Recorded Investment 9,675,000   9,827,000    
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 19,816,000   19,816,000   4,157,000
Commercial Real Estate [Member] | Financial Asset, Not Past Due          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, before Allowance for Credit Loss 3,029,418,000   3,029,418,000   3,028,101,000
Commercial Real Estate [Member] | Multifamily          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Charge-offs 0 0 0 0  
Loans and Leases Receivable, Gross 590,471,000   590,471,000   551,142,000
Loans and Leases Receivable, Net of Deferred Income 590,471,000   590,471,000   551,142,000
Financing Receivable, before Allowance for Credit Loss 590,471,000   590,471,000   551,142,000
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 21,000   21,000   0
Commercial Real Estate [Member] | Multifamily | Financial Asset, Not Past Due          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, before Allowance for Credit Loss 590,403,000   590,403,000   551,087,000
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Charge-offs 187,000 $ 0 470,000 0  
Loans and Leases Receivable, Gross 1,766,550,000   1,766,550,000   1,772,785,000
Loans and Leases Receivable, Net of Deferred Income 1,766,550,000   1,766,550,000   1,772,785,000
Financing Receivable, before Allowance for Credit Loss 1,766,550,000   1,766,550,000   1,772,785,000
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate | Financial Asset, 30 to 59 Days Past Due [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, before Allowance for Credit Loss 10,918,000   10,918,000   2,303,000
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate | Financial Asset, 30 to 59 Days Past Due [Member] | Subsequently Paid Off Loan          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, before Allowance for Credit Loss 10,100,000   10,100,000    
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate | Financial Asset, Not Past Due          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, before Allowance for Credit Loss 1,732,406,000   $ 1,732,406,000   1,752,691,000
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   $ 0
Loans and Leases Receivable, Gain (Loss) on Sales, Net     $ 0 $ 0