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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 132,167 |
Impact of adopting ASC 326 | $ 0 | $ 0 | 39,377 | $ 0
Ending balance | 263,475 |  | 263,475 |
Commercial Portfolio Segment [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 98,536 | 57,714 | 51,593 | 48,580
Impact of adopting ASC 326 |  |  | 21,263 |
Credit loss expense | (18,547) | (3,527) | 10,737 | 9,999
Charge-offs | (8,605) | (2,705) | (14,815) | (8,782)
Recoveries | 1,121 | 1,185 | 3,727 | 2,870
Net charge-offs | (7,484) | (1,520) | (11,088) | (5,912)
Ending balance | 72,505 | 52,667 | 72,505 | 52,667
Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 40,817 | 25,818 | 37,382 | 29,052
Impact of adopting ASC 326 |  |  | (10,453) |
Credit loss expense | 13,814 | 8,788 | 96,478 | 7,478
Charge-offs | 0 | (2,000) | (68,842) | (4,000)
Recoveries | 0 | 740 | 66 | 816
Net charge-offs | 0 | (1,260) | (68,776) | (3,184)
Ending balance | 54,631 | 33,346 | 54,631 | 33,346
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 93,425 | 35,914 | 31,037 | 38,777
Impact of adopting ASC 326 |  |  | (13,519) |
Credit loss expense | 25,368 | (607) | 104,716 | (2,972)
Charge-offs | (242) | 0 | (3,826) | (617)
Recoveries | 42 | 46 | 185 | 165
Net charge-offs | (200) | 46 | (3,641) | (452)
Ending balance | 118,593 | 35,353 | 118,593 | 35,353
Total consumer real estate loans [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 8,998 | 5,637 | 4,113 | 6,103
Impact of adopting ASC 326 |  |  | 2,392 |
Credit loss expense | 1,794 | (650) | 3,716 | 859
Charge-offs | (1,088) | (557) | (1,508) | (2,936)
Recoveries | 573 | 454 | 1,564 | 858
Net charge-offs | (515) | (103) | 56 | (2,078)
Ending balance | 10,277 | 4,884 | 10,277 | 4,884
Consumer Loan [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 8,285 | 9,846 | 8,042 | 9,620
Impact of adopting ASC 326 |  |  | (2,248) |
Credit loss expense | 1,161 | 3,997 | 8,096 | 10,040
Charge-offs | (4,219) | (6,357) | (13,402) | (17,157)
Recoveries | 2,242 | 2,823 | 6,981 | 7,806
Net charge-offs | (1,977) | (3,534) | (6,421) | (9,351)
Ending balance | 7,469 | 10,309 | 7,469 | 10,309
Loans Receivable [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 250,061 | 134,929 | 132,167 | 132,132
Impact of adopting ASC 326 |  |  | (2,565) |
Credit loss expense | 23,590 | 8,001 | 223,743 | 25,404
Charge-offs | (14,154) | (11,619) | (102,393) | (33,492)
Recoveries | 3,978 | 5,248 | 12,523 | 12,515
Net charge-offs | (10,176) | (6,371) | (89,870) | (20,977)
Ending balance | $ 263,475 | $ 136,559 | $ 263,475 | $ 136,559

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