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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, 2022 | Mar. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | $ 248,666 |
Ending balance | 246,835 |
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 72,091 | $ 73,843
Credit loss, expense (reversal) | 17,561 | (1,965)
Charge-offs | (3,455) | (2,189)
Recoveries | 829 | 1,203
Net charge-offs | (2,626) | (986)
Ending balance | 87,026 | 70,892
Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 17,217 | 39,553
Credit loss, expense (reversal) | (2,044) | (5,801)
Charge-offs | (371) | (1,433)
Recoveries | 620 | 1,153
Net charge-offs | 249 | (280)
Ending balance | 15,422 | 33,472
Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 144,936 | 134,892
Credit loss, expense (reversal) | (15,609) | 8,922
Charge-offs | (702) | 0
Recoveries | 329 | 626
Net charge-offs | (373) | 626
Ending balance | 128,954 | 144,440
Total consumer real estate loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 6,585 | 7,926
Credit loss, expense (reversal) | (26) | (2,722)
Charge-offs | (231) | (284)
Recoveries | 31 | 716
Net charge-offs | (200) | 432
Ending balance | 6,359 | 5,636
Consumer Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 7,837 | 6,963
Credit loss, expense (reversal) | 4,582 | 1,566
Charge-offs | (5,771) | (4,060)
Recoveries | 2,426 | 2,349
Net charge-offs | (3,345) | (1,711)
Ending balance | 9,074 | 6,818
Loans Receivable [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 248,666 | 263,177
Credit loss, expense (reversal) | 4,464 | 0
Charge-offs | (10,530) | (7,966)
Recoveries | 4,235 | 6,047
Net charge-offs | (6,295) | (1,919)
Ending balance | $ 246,835 | $ 261,258

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