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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 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 | 250,061 |  | 250,061 |
Commercial Portfolio Segment [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 92,152 | 58,571 | 51,593 | 48,580
Impact of adopting ASC 326 |  |  | 21,263 |
Credit loss expense | 7,334 | 1,597 | 29,284 | 13,526
Charge-offs | (1,841) | (3,389) | (6,210) | (6,077)
Recoveries | 891 | 935 | 2,606 | 1,685
Net charge-offs | (950) | (2,454) | (3,604) | (4,392)
Ending balance | 98,536 | 57,714 | 98,536 | 57,714
Commercial and Industrial Total Energy Loans [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 103,201 | 25,343 | 37,382 | 29,052
Impact of adopting ASC 326 |  |  | (10,453) |
Credit loss expense | (27,342) | 2,446 | 82,664 | (1,310)
Charge-offs | (35,042) | (2,000) | (68,842) | (2,000)
Recoveries | 0 | 29 | 66 | 76
Net charge-offs | (35,042) | (1,971) | (68,776) | (1,924)
Ending balance | 40,817 | 25,818 | 40,817 | 25,818
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 52,319 | 36,455 | 31,037 | 38,777
Impact of adopting ASC 326 |  |  | (13,519) |
Credit loss expense | 44,587 | (13) | 79,348 | (2,365)
Charge-offs | (3,511) | (557) | (3,584) | (617)
Recoveries | 30 | 29 | 143 | 119
Net charge-offs | (3,481) | (528) | (3,441) | (498)
Ending balance | 93,425 | 35,914 | 93,425 | 35,914
Total consumer real estate loans [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 8,170 | 5,661 | 4,113 | 6,103
Impact of adopting ASC 326 |  |  | 2,392 |
Credit loss expense | 352 | 262 | 1,922 | 1,509
Charge-offs | (135) | (601) | (420) | (2,379)
Recoveries | 611 | 315 | 991 | 404
Net charge-offs | 476 | (286) | 571 | (1,975)
Ending balance | 8,998 | 5,637 | 8,998 | 5,637
Consumer Loan [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 8,039 | 10,320 | 8,042 | 9,620
Impact of adopting ASC 326 |  |  | (2,248) |
Credit loss expense | 2,297 | 2,108 | 6,935 | 6,043
Charge-offs | (4,178) | (5,103) | (9,183) | (10,800)
Recoveries | 2,127 | 2,521 | 4,739 | 4,983
Net charge-offs | (2,051) | (2,582) | (4,444) | (5,817)
Ending balance | 8,285 | 9,846 | 8,285 | 9,846
Loans Receivable [Member] |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |
Beginning balance | 263,881 | 136,350 | 132,167 | 132,132
Impact of adopting ASC 326 |  |  | (2,565) |
Credit loss expense | 27,228 | 6,400 | 200,153 | 17,403
Charge-offs | (44,707) | (11,650) | (88,239) | (21,873)
Recoveries | 3,659 | 3,829 | 8,545 | 7,267
Net charge-offs | (41,048) | (7,821) | (79,694) | (14,606)
Ending balance | $ 250,061 | $ 134,929 | $ 250,061 | $ 134,929

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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