v3.25.2
Loans - Activity in the Allowance for Credit Losses on Loans by Portfolio Segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning Balance     $ 270,151  
Ending Balance $ 277,803   277,803  
Commercial Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning Balance 94,307 $ 75,596 87,569 $ 74,006
Credit loss expense (benefit) 4,315 6,936 14,496 8,928
Charge-offs (4,163) (4,282) (8,499) (6,426)
Recoveries 1,025 304 1,918 2,046
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net (3,138) (3,978) (6,581) (4,380)
Ending Balance 95,484 78,554 95,484 78,554
Commercial and Industrial Total Energy Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning Balance 10,256 14,218 9,992 17,814
Credit loss expense (benefit) (47) (3,038) (85) (6,814)
Charge-offs 0 (79) (52) (79)
Recoveries 180 384 534 564
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net 180 305 482 485
Ending Balance 10,389 11,485 10,389 11,485
Commercial Real Estate Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning Balance 143,177 138,224 143,205 130,598
Credit loss expense (benefit) 383 1,903 2,353 9,513
Charge-offs (2,639) (122) (4,639) (122)
Recoveries 2 15 4 31
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net (2,637) (107) (4,635) (91)
Ending Balance 140,923 140,020 140,923 140,020
Total consumer real estate loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning Balance 18,924 13,857 19,106 13,538
Credit loss expense (benefit) 3,821 2,175 4,250 3,981
Charge-offs (1,292) (408) (2,250) (2,077)
Recoveries 254 83 601 265
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net (1,038) (325) (1,649) (1,812)
Ending Balance 21,707 15,707 21,707 15,707
Consumer Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning Balance 8,824 8,402 10,279 10,040
Credit loss expense (benefit) 4,994 7,760 7,480 11,778
Charge-offs (7,290) (8,360) (14,134) (16,617)
Recoveries 2,772 2,739 5,675 5,340
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net (4,518) (5,621) (8,459) (11,277)
Ending Balance 9,300 10,541 9,300 10,541
Loans Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Beginning Balance 275,488 250,297 270,151 245,996
Credit loss expense (benefit) 13,466 15,736 28,494 27,386
Charge-offs (15,384) (13,251) (29,574) (25,321)
Recoveries 4,233 3,525 8,732 8,246
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Write-offs, Net (11,151) (9,726) (20,842) (17,075)
Ending Balance $ 277,803 $ 256,307 $ 277,803 $ 256,307