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Loans - Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 18,223,877 | $ 14,750,332
Total loans percentage | 100.00% | 100.00%
Commercial Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 4,820,018 | $ 5,187,466
Total commercial and industrial percentage of total loans | 26.40% | 35.20%
Energy Production [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 1,108,753 | $ 1,348,900
Percentage of energy production loans to total loans | 6.10% | 9.20%
Energy Service [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 163,197 | $ 192,996
Percentage of energy service loans to total loans | 0.90% | 1.30%
Energy Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 91,418 | $ 110,986
Percentage of other energy loans to total loans | 0.40% | 0.80%
Commercial and Industrial Total Energy Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 1,363,368 | $ 1,652,882
Percentage of total energy loans to total loans | 7.40% | 11.20%
Paycheck Protection Program [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 3,226,980 | $ 0
Percentage Of Payment Protection Program Loans To Loans | 17.70% | 0.00%
Commercial mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 5,412,731 | $ 4,594,113
Commercial mortgages percentage of total loans | 29.70% | 31.10%
Construction Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 1,274,080 | $ 1,312,659
Construction percentage of total loans | 7.00% | 8.90%
Commercial land loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 320,407 | $ 289,467
Land percentage of total loans | 1.80% | 2.00%
Commercial Real Estate Portfolio Segment [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 7,007,218 | $ 6,196,239
Total commercial real estate percentage of total loans | 38.50% | 42.00%
Home Equity Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 340,226 | $ 375,596
Home equity loans percentage of total loans | 1.90% | 2.60%
Home Equity Line of Credit [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 434,171 | $ 354,671
Home equity lines of credit percentage of total loans | 2.40% | 2.40%
Other consumer real estate loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 533,356 | $ 464,146
Other percentage of total loans | 2.90% | 3.10%
Total consumer real estate loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 1,307,753 | $ 1,194,413
Total consumer real estate percentage of total loans | 7.20% | 8.10%
Real Estate Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 8,314,971 | $ 7,390,652
Total real estate percentage of total loans | 45.70% | 50.10%
Consumer Loan [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned discounts | $ 498,540 | $ 519,332
Total consumer and other percentage of total loans | 2.80% | 3.50%

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