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Loans - Activity in the Allowance for Credit Losses on Loans by Portfolio Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance $ 270,151  
Ending Balance 275,488  
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance 87,569 $ 74,006
Credit loss expense (benefit) 10,181 1,992
Charge-offs (4,336) (2,144)
Recoveries 893 1,742
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net (3,443) (402)
Ending Balance 94,307 75,596
Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance 9,992 17,814
Credit loss expense (benefit) (38) (3,776)
Charge-offs (52) 0
Recoveries 354 180
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net 302 180
Ending Balance 10,256 14,218
Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance 143,205 130,598
Credit loss expense (benefit) 1,970 7,610
Charge-offs (2,000) 0
Recoveries 2 16
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net (1,998) 16
Ending Balance 143,177 138,224
Total consumer real estate loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance 19,106 13,538
Credit loss expense (benefit) 429 1,806
Charge-offs (958) (1,669)
Recoveries 347 182
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net (611) (1,487)
Ending Balance 18,924 13,857
Consumer Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance 10,279 10,040
Credit loss expense (benefit) 2,486 4,018
Charge-offs (6,844) (8,257)
Recoveries 2,903 2,601
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net (3,941) (5,656)
Ending Balance 8,824 8,402
Loans Receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning Balance 270,151 245,996
Credit loss expense (benefit) 15,028 11,650
Charge-offs (14,190) (12,070)
Recoveries 4,499 4,721
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net (9,691) (7,349)
Ending Balance $ 275,488 $ 250,297