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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, 2024 | Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | $ 245,996 |
Ending balance | 250,297 |
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 74,006 | $ 104,237
Credit loss, expense (reversal) | 1,992 | (20,684)
Charge-offs | (2,144) | (6,180)
Recoveries | 1,742 | 1,092
Net charge-offs | (402) | (5,088)
Ending balance | 75,596 | 78,465
Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 17,814 | 18,062
Credit loss, expense (reversal) | (3,776) | 966
Charge-offs | 0 | 0
Recoveries | 180 | 163
Net charge-offs | 180 | 163
Ending balance | 14,218 | 19,191
Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 130,598 | 90,301
Credit loss, expense (reversal) | 7,610 | 25,361
Charge-offs | 0 | 0
Recoveries | 16 | 31
Net charge-offs | 16 | 31
Ending balance | 138,224 | 115,693
Total consumer real estate loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 13,538 | 8,004
Credit loss, expense (reversal) | 1,806 | 1,283
Charge-offs | (1,669) | (250)
Recoveries | 182 | 671
Net charge-offs | (1,487) | 421
Ending balance | 13,857 | 9,708
Consumer Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 10,040 | 7,017
Credit loss, expense (reversal) | 4,018 | 5,749
Charge-offs | (8,257) | (6,942)
Recoveries | 2,601 | 2,633
Net charge-offs | (5,656) | (4,309)
Ending balance | 8,402 | 8,457
Loans Receivable [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 245,996 | 227,621
Credit loss, expense (reversal) | 11,650 | 12,675
Charge-offs | (12,070) | (13,372)
Recoveries | 4,721 | 4,590
Net charge-offs | (7,349) | (8,782)
Ending balance | $ 250,297 | $ 231,514

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