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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance |  |  | $ 248,666 |
Ending balance | $ 239,632 |  | 239,632 |
Commercial Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 87,026 | $ 70,892 | 72,091 | $ 73,843
Credit loss, expense (reversal) | 942 | (5,901) | 18,503 | (7,866)
Charge-offs | (1,891) | (685) | (5,346) | (2,874)
Recoveries | 1,193 | 965 | 2,022 | 2,168
Net charge-offs | (698) | 280 | (3,324) | (706)
Ending balance | 87,270 | 65,271 | 87,270 | 65,271
Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 15,422 | 33,472 | 17,217 | 39,553
Credit loss, expense (reversal) | 427 | (5,527) | (1,617) | (11,328)
Charge-offs | 0 | 0 | (371) | (1,433)
Recoveries | 418 | 65 | 1,038 | 1,218
Net charge-offs | 418 | 65 | 667 | (215)
Ending balance | 16,267 | 28,010 | 16,267 | 28,010
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 128,954 | 144,440 | 144,936 | 134,892
Credit loss, expense (reversal) | (12,232) | 3,654 | (27,841) | 12,576
Charge-offs | 0 | (137) | (702) | (137)
Recoveries | 384 | 36 | 713 | 662
Net charge-offs | 384 | (101) | 11 | 525
Ending balance | 117,106 | 147,993 | 117,106 | 147,993
Total consumer real estate loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 6,359 | 5,636 | 6,585 | 7,926
Credit loss, expense (reversal) | 583 | 611 | 557 | (2,111)
Charge-offs | (131) | (388) | (362) | (672)
Recoveries | 43 | 295 | 74 | 1,011
Net charge-offs | (88) | (93) | (288) | 339
Ending balance | 6,854 | 6,154 | 6,854 | 6,154
Consumer Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 9,074 | 6,818 | 7,837 | 6,963
Credit loss, expense (reversal) | 5,884 | 2,784 | 10,466 | 4,350
Charge-offs | (5,322) | (3,882) | (11,093) | (7,942)
Recoveries | 2,499 | 2,140 | 4,925 | 4,489
Net charge-offs | (2,823) | (1,742) | (6,168) | (3,453)
Ending balance | 12,135 | 7,860 | 12,135 | 7,860
Loans Receivable [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Beginning balance | 246,835 | 261,258 | 248,666 | 263,177
Credit loss, expense (reversal) | (4,396) | (4,379) | 68 | (4,379)
Charge-offs | (7,344) | (5,092) | (17,874) | (13,058)
Recoveries | 4,537 | 3,501 | 8,772 | 9,548
Net charge-offs | (2,807) | (1,591) | (9,102) | (3,510)
Ending balance | $ 239,632 | $ 255,288 | $ 239,632 | $ 255,288

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