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Loans - Activity in the Allowance for Credit Losses on Loans by Portfolio Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance |  |  | $ 245,996 |
Ending balance | $ 263,129 |  | 263,129 |
Commercial Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 78,554 | $ 75,166 | 74,006 | $ 104,237
Credit loss, expense (reversal) | 4,697 | (623) | 13,625 | (18,903)
Charge-offs | (3,907) | (943) | (10,333) | (14,259)
Recoveries | 1,232 | 707 | 3,278 | 3,232
Net charge-offs | (2,675) | (236) | (7,055) | (11,027)
Ending balance | 80,576 | 74,307 | 80,576 | 74,307
Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 11,485 | 14,929 | 17,814 | 18,062
Credit loss, expense (reversal) | 146 | 1,784 | (6,668) | (1,683)
Charge-offs | 0 | 0 | (79) | (518)
Recoveries | 490 | 353 | 1,054 | 1,205
Net charge-offs | 490 | 353 | 975 | 687
Ending balance | 12,121 | 17,066 | 12,121 | 17,066
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 140,020 | 120,926 | 130,598 | 90,301
Credit loss, expense (reversal) | 2,791 | 5,424 | 12,304 | 35,918
Charge-offs | 0 | (62) | (122) | (62)
Recoveries | 14 | 204 | 45 | 335
Net charge-offs | 14 | 142 | (77) | 273
Ending balance | 142,825 | 126,492 | 142,825 | 126,492
Total consumer real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 15,707 | 13,035 | 13,538 | 8,004
Credit loss, expense (reversal) | 3,838 | 2,130 | 7,819 | 7,235
Charge-offs | (2,013) | (170) | (4,090) | (1,500)
Recoveries | 120 | 44 | 385 | 1,300
Net charge-offs | (1,893) | (126) | (3,705) | (200)
Ending balance | 17,652 | 15,039 | 17,652 | 15,039
Consumer Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 10,541 | 9,563 | 10,040 | 7,017
Credit loss, expense (reversal) | 4,990 | 4,893 | 16,768 | 15,649
Charge-offs | (8,007) | (8,189) | (24,624) | (22,147)
Recoveries | 2,431 | 3,064 | 7,771 | 8,812
Net charge-offs | (5,576) | (5,125) | (16,853) | (13,335)
Ending balance | 9,955 | 9,331 | 9,955 | 9,331
Loans Receivable [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 256,307 | 233,619 | 245,996 | 227,621
Credit loss, expense (reversal) | 16,462 | 13,608 | 43,848 | 38,216
Charge-offs | (13,927) | (9,364) | (39,248) | (38,486)
Recoveries | 4,287 | 4,372 | 12,533 | 14,884
Net charge-offs | (9,640) | (4,992) | (26,715) | (23,602)
Ending balance | $ 263,129 | $ 242,235 | $ 263,129 | $ 242,235

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